Journal articles on the topic 'Impellers'
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1
Mohsin, Aveen T., and Banipal N. Yaqob. "Experimental Investigation on Improving Lifetime of Peripheral Pump Impeller under Cavitation Using Different Techniques." International Journal of Heat and Technology 40, no. 5 (November 30, 2022): 1258–64. http://dx.doi.org/10.18280/ijht.400518.
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The industry is becoming more interested in peripheral pumps because they are inexpensive, have low specific speeds, and are small. One of the more serious problems that may occur with any pump is cavitation. That has a significant impact on pump components, particularly the impeller. This work presents a detailed experimental study on prolonging impeller lifespan under cavitation conditions by studying the effect of impeller surface finishing and coatings on its lifetime. For this purpose, seven impellers, in addition to the original one of the peripheral pump, had prepared and treated. Three impellers with three different levels of arithmetic surface roughness (Ra) were produced using a low-cost and customizable hand grinding procedure. And four impellers have been coated thermally with four different erosion-resistant composite materials. All of the impellers were cavitated for 300 minutes at normal and one at high water temperatures. The result showed that the mass loss percentages with the smallest (Ra) of 0.35µm, and coated with yellow epoxy were 84.86% and 48.50% lower than the original impeller, respectively. Thus, improving the quality of impeller surface finishing, and thermal coatings are excellent method for increasing the impeller's cavitation erosion resistance and thereby extending its lifetime.
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Pardue, E. B. S., M. V. Mathis, R. W. Hendricks, and E. M. Stangeland. "Space Shuttle Main Engine Hydrogen Pump Impeller Residual Stress Measurements Using Pars (Portable Apparatus for Measurement of Residual Stress)." Advances in X-ray Analysis 29 (1985): 37–42. http://dx.doi.org/10.1154/s0376030800010090.
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X-ray residual stress analysis was performed on four space shuttle hydrogen pump impellers made from Ti-5Al-2,5Sn alloy. Five locations on the outer rim, near the vanes, were measured on each impeller, identified as #1, #2,#3, and #4. Impellers #1 and #4 were test-fired impellers, impeller #2 was a new impeller that had been spin tested, and impeller #3 was a new impeller that had not teen spin tested. The measurement locations on these impellers corresponded to areas of critical stress importance. The purpose of the measurements was to compare the stresses at these locations as a function of impeller processing variables. A description of the Impellers, the test parameters and procedures, stress analysis results, and a technical discussion of these results are presented in this report.A description of the Impellers, the test parameters and procedures, stress analysis results, and a technical discussion of these results are presented in this report.
3
Jirout, Tomáš. "Pumping Capacity of Pitched Blade Multi-Stage Impellers." Chemical and Process Engineering 35, no. 1 (March 1, 2014): 47–53. http://dx.doi.org/10.2478/cpe-2014-0004.
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Abstract This paper extends knowledge about flow in an agitated batch with pitched blade multi-stage impellers. Effects of various geometrical parameters (blade number, distance between impellers) of pitched blade multi-stage impellers on pumping ability have been investigated. Axial velocity profiles were measured by LDA (Laser Doppler Anemometry). Axial pumping capacities were obtained by integration of measured axial velocity profiles in outflow from impellers. Main attention was focused on the effect of the distance between impellers in multi-stage configurations, on their pumping capacity and flow in the mixing bath in comparison with an independently operating pitched blade impeller with the same geometry. In case of a relatively close distance between impellers H3/d = 0.5 - 0.75, the multi-stage impeller creates only one circulation loop and the impellers itself behave identically as pumps in series. However for relative higher distance of impellers than H3/d = 1.25, the multi-stage impeller creates two separated circulation loops.
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Tan, Ching Ying, Mohd Izzudin Izzat Zainal Abidin, and Mohd Usman Mohd Junaidi. "Effects of impeller designs and configurations on the flow field in multiple impeller system using Computational Fluid Dynamics (CFD)." Research Communication in Engineering Science & Technology 5 (April 1, 2022): 1–9. http://dx.doi.org/10.22597/rcest.v5.134.
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The work presents the computational study of the flow field in multiple impellers stirred vessel with various impeller types and configurations at 300rpm, 450rpm and 600rpm. Three types of impellers are investigated, namely the pitched blade impeller (PB), flat blade impeller (FB) and sawtooth impeller (ST). In this study, the flow patterns, turbulent kinetic energy dissipation, and power consumption in dual impellers system have been studied using computational fluid dynamics (CFD) by employing the multiple reference frame (MRF) and realizable k-ɛ turbulence model. The results from PBFB and reversed FBPB indicate efficient and powerful mixing with the merging of flows from both impellers that circulates the entire vessel. Besides, the FB and ST configuration exhibits the mixing characteristics that enhance both dispersion and mixing homogeneity. It is proven in this study that the combination of axial and radial impellers improves the weak mixing zones in the stirred vessel by the complex flow patterns produced. On top of that, utilizing two different impellers could achieve two mixing objectives in a system with the exceptional features of each impeller. The results establish promising effects of the reverse rotation in axial impellers and the arrangement of two different impellers in a multiple impeller system. With the rapid growth of industrialization, understanding the fluid dynamics in a multiple impeller stirred vessel is fundamental to optimize and scale up industrial mixing operations. Hence, the empirical findings in this study will be beneficial in selecting the suitable combination of impellers and the orientations that will enhance industrial mixing operations. Apart from that, the present work also illustrates that the computational technique used can be extremely valuable in determining the fluid dynamics in complex multiple impeller system which is challenging to analyse experimentally.
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Machoň, Václav, and Jiří Vlček. "Aeration of liquids in a vessel equipped with multistage impellers." Collection of Czechoslovak Chemical Communications 50, no. 12 (1985): 2863–72. http://dx.doi.org/10.1135/cccc19852863.
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The paper deals with the influence of the number of impellers and the mode of aeration on the mechanical power input in a stirred gas-liquid dispersion using two impellers on the same shaft. Gas has been supplied either under the lower impeller or under both impellers. The power input was measured in the water-air system. A six-blade turbine impeller of the Rushton type and/or impellers with six inclined blades (with downward or upward pumping effect) were used. Experimental results have been obtained for a single impeller in a tank where the depth of liquid was equal to the tank diameter, and for different combinations of two impellers located on a single shaft where the distance between the impellers was equal to the tank diameter and the liquid depth was twice this diameter. It has been found that the power input data for the two-impeller system of two turbines can be correlated adequately by a simple equation. An estimate was made of the amount of gas supplied below the lower impeller which was transported into the region of the upper impeller.
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Hu, Fan Jin, Shen Jie Zhou, Feng Ling Yang, and Lei Shi. "CFD Study of the Mixing of Pseudoplastic Fluids with Yield Stress in a Two-Staged Stirred Tank." Advanced Materials Research 354-355 (October 2011): 604–8. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.604.
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The 3D flow field generated by two-stage impellers in the agitation of xanthan gum, a pseudoplastic fluid with yield stress, was simulated using the commerical CFD package. The effect of impeller speed and impeller spacing on power number, cavern size and viscosity distribution was investigated in this work. The results showed that the power number was slightly influenced by impeller spacing. Higher impeller speed and larger impeller spacing contributed to creation of a bigger cavern. The range of high viscosity zone between the impellers increased with an increase in impeller spacing. Impeller speed and impeller spacing could be used as important parameters to improve the mixing performance of multi-stage impellers in the mixing of pseudoplastic fluids with yield stress.
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Zhang, Yu-Liang, and Wen-Guang Li. "An analytical method for determining the optimum number of blades of the compound impeller in a low specific speed centrifugal pump." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 234, no. 6 (June 21, 2020): 576–87. http://dx.doi.org/10.1177/0954408920934665.
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Reasonable methods for determining the optimum number of blades in a low specific speed centrifugal pump with closed-type impeller with splitters, i.e. compound impeller have been rather rare in the literature so far. In the article, a new analytical method was put forward to determine such an optimum number of blades by including the effect of turbulent boundary layer over impeller blades. Three conventional impellers with different numbers of full-length blades and two compound impellers with different numbers of splitters were designed and manufactured. The corresponding performance tests were then conducted. Results showed that the optimum numbers of blades exist for two kinds of impeller in terms of head at design point, pump efficiencies at design point and best efficiency point, and slope of head-flow rate curve at shut-off point. The estimated optimum numbers of blades are in good agreement with the numbers based on the experiments. The conventional impellers with full-length blades are more prone to the hump phenomenon than the compound impellers at the optimum numbers of blades. For the compound impellers, however, the hump effect is negligible at the optimum number of blades, and their head and efficiency are higher than those for the impellers with full-length blades. The method is applicable to compound impeller design in low specific speed centrifugal pumps.
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Qu, Li Ge. "Study on Processing Technology of Turbocharger Impeller and Shaft." Applied Mechanics and Materials 556-562 (May 2014): 1026–29. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.1026.
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The processing technology of turbocharger impeller shaft involves shaft processing and Impeller processing two aspects of content. The design of casting impeller’s processing technology is based on reducing metal removal of the impeller dynamic balance. Casting impeller is an efficient method for the production of impellers, the dynamic balance of precision casting impeller itself can be used to achieve the use requirement of the impeller. It can meet the requirement of dynamic balance as the impeller rotation when the axis of impeller’s symmetry axis as locating datum in the process of machining. It means reduced the metal removal of dynamic balance. We Put the impeller axis symmetry as the processing benchmark, and then design a processing method of shaft and impeller. It can ensure concentricity of the two shafts when implement the processing technology of shaft and impeller after welding. At the same time achieve the requirements of the minimum Metal removal of Impeller shaft dynamic balance.
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Abuchar-Curi, Alfredo M., Oscar E. Coronado-Hernández, Jairo Useche, Verónica J. Abuchar-Soto, Argemiro Palencia-Díaz, Duban A. Paternina-Verona, and Helena M. Ramos. "Improving Pump Characteristics through Double Curvature Impellers: Experimental Measurements and 3D CFD Analysis." Fluids 8, no. 8 (July 27, 2023): 217. http://dx.doi.org/10.3390/fluids8080217.
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The outlet angle and shape of impeller blades are important parameters in centrifugal pump design. There is a lack of detailed studies related to double curvature impellers in centrifugal pumps in the current literature; therefore, an experimental and numerical analysis of double curvature impellers was performed. Six impellers were made and then assessed in a centrifugal pump test bed and simulated via 3D CFD simulation. The original impeller was also tested and simulated. One of the manufactured impellers had the same design as the original, and the other five impellers had a double curvature. Laboratory tests and simulations were conducted with three rotation speeds: 1400, 1700, and 1900 RPM. Head and performance curve equations were obtained for the pump–engine unit based on the flow of each impeller for the three rotation speeds. The results showed that a double curvature impeller improved pump head by approximately 1 m for the range of the study and performance by about 2% when compared to basic impeller. On the other hand, it was observed that turbulence models such as k-ε and SST k-ω reproduced similar physical and numerical results.
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An, C., Y. Chen, R. Zhu, X. Wang, Y. Yang, and J. Shi . "Internal Flow Phenomena of Two-Way Contra-Rotating Axial Flow Pump-Turbine in Pump Mode under Variable Speed." Journal of Applied Fluid Mechanics 16, no. 2 (February 1, 2023): 285–97. http://dx.doi.org/10.47176/jafm.16.02.1140.
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This paper investigated the variable speed operation of a two-way contra-rotating axial flow pump–turbine in pump mode. When counter-rotating impellers operate at the same speed, a significant difference exists in the shaft power of the two impellers, thereby causing difficulties in motor selection. However, the same motor is required for both impellers in two-way pump–turbines. To solve this problem, this paper aims to determine the appropriate speed at which the two impellers operate with a similar shaft power. Accordingly, improving the performance of the tidal unit while enabling the basic functions of the pump–turbine is of considerable engineering and academic significance. An analysis of performance variations of the front and rear impellers in the pump mode reveals the law of power variation for each impeller at different speeds of the rear impeller. Under different flow conditions, shaft power of the rear impeller is found to be at least 31% higher compared with that of the front impeller. This result provides practical reference for further research on the operation of counter-rotating axial flow pump–turbine.
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Pan, Hong Gang, You Ning Xu, Dong Lai Yi, Jing Chao Sun, Peng Fei Du, and Chun Ming Zhang. "Analysis of Turbine Impeller Vibration Test Equipment." Applied Mechanics and Materials 457-458 (October 2013): 395–98. http://dx.doi.org/10.4028/www.scientific.net/amm.457-458.395.
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The mode of the impeller of steam turbines vibration frequency is recorded by simulated experiment of the impellers vibration in the exciting method. And the main negative effects for the impeller of steam turbines vibration are analyzed through the simulated experiment, so the impellers vibration can be avoided through modulating the targeted elements. The accident during the steam turbines running caused by the impellers vibration can be decreased.
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Shen, Wenjie, Suofang Wang, and Xiaodi Liang. "Effect of Impellers on the Cooling Performance of a Radial Pre-Swirl System in Gas Turbine Engines." Aerospace 11, no. 3 (February 26, 2024): 187. http://dx.doi.org/10.3390/aerospace11030187.
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Impellers are utilized to increase pressure to ensure that a radial pre-swirl system can provide sufficient cooling airflow to the turbine blades. In the open literature, the pressurization mechanism of the impellers was investigated. However, the effect of impellers on the cooling performance of the radial pre-swirl system was not clear. To solve the aforementioned problem, tests were carried out to assess the temperature drop in a radial pre-swirl system with various impeller configurations (impeller lengths l/b ranging from 0 to 0.333). Furthermore, numerical simulations were used to investigate the flow and heat transfer characteristics of the radial pre-swirl system at high rotating Reynolds numbers. Theoretical and experimental investigations revealed that the pre-swirl jet and output power generate a significant temperature drop, but the impellers have no obvious effect on the system temperature drop. By increasing the swirl ratio, the impellers reduce the field synergy angle and thus improve convective heat transfer on the turbine disk. In addition, increasing the impeller length can reduce the volume-averaged field synergy angle and improve heat transfer, but the improvement effectiveness decreases as the impeller length increases. Thus, the study concluded that impellers could improve the cooling performance of the radial pre-swirl system by enhancing disk cooling.
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Beck, David, and Paul Uwe Thamsen. "Development of Sewage Pumps with Numerical and Experimental Support." International Journal of Turbomachinery, Propulsion and Power 8, no. 2 (June 2, 2023): 18. http://dx.doi.org/10.3390/ijtpp8020018.
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Especially in the field of sewage pumps, the design of radial impellers focuses not only on maximum efficiency but also on functionality in terms of susceptibility to clogging by fibrous media. In general, the efficiency of sewage impellers is significantly lower than that of clear water impellers. These sewage impellers are designed with a low number of blades to ensure that fibrous media can be pumped. This paper describes the methodology of an optimisation for a sewage impeller. The optimisation is carried out on a semi-open two-channel impeller as an example. Therefore, a new impeller is designed for a given volute casing. Based on a basic design for given boundary conditions, the impeller is verified by means of numerical simulation. The manufactured impeller is then tested on the test rig to verify the simulation. With regard to the optical investigations, the clogging behaviour of the impeller is specifically improved over three different modifications in order to finally present an impeller with good efficiency and a low clogging tendency.
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Ebrahimi, Tamer, Villegas, Chiappetta, and Ein-Mozaffari. "Application of CFD to Analyze the Hydrodynamic Behaviour of a Bioreactor with a Double Impeller." Processes 7, no. 10 (October 3, 2019): 694. http://dx.doi.org/10.3390/pr7100694.
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Stirred bioreactors are commonly used unit operations in the pharmaceutical industry. In this study, computational fluid dynamics (CFD) was used in order to analyze the influence of the impeller configuration (Segment–Segment and Segment–Rushton impeller configurations) and the impeller rotational speed (an operational parameter) on the hydrodynamic behaviour and mixing performance of a bioreactor equipped with a double impeller. A relatively close agreement between the power values obtained from the CFD model and those measured experimentally was observed. Various parameters such as velocity profiles, stress generated by impellers due to the turbulence and velocity gradient, flow number, and mixing time were used to compare the CFD simulations. It was observed that the impeller’s RPM could change the intensity of the interaction between the impellers when a Segment–Rushton impeller was used. In general, increasing the RPM led to an increase in total power and the stress acting on the cells and to a shorter mixing time. At a constant RPM, the Segment–Rushton impeller configuration had higher total power and stress acting on cells compared to the Segment–Segment impeller configuration. At lower RPM values (i.e., 50 and 100), the Segment–Segment impeller provided a shorter mixing time. Conversely, at the highest RPM (i.e., 150) the Segment–Rushton impeller had a shorter mixing time compared to the Segment–Segment impeller; this was attributed to the high level of turbulence generated with the former impeller configuration at high RPM.
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Fořt, Ivan, Pavel Seichter, Luboš Pešl, František Rieger, and Tomáš Jirout. "BLENDING CHARACTERISTICS OF HIGH-SPEED ROTARY IMPELLERS." Chemical and Process Engineering 34, no. 4 (December 1, 2013): 427–34. http://dx.doi.org/10.2478/cpe-2013-0035.
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Abstract This paper presents a comparison of the blending efficiency of eight high-speed rotary impellers in a fully baffled cylindrical vessel under the turbulent flow regime of agitated charge. Results of carried out experiments (blending time and impeller power input) confirm that the down pumping axial flow impellers exhibit better blending efficiency than the high-speed rotary impellers with prevailing radial discharge flow. It follows from presented results that, especially for large scale industrial realisations, the axial flow impellers with profiled blades bring maximum energy savings in comparison with the standard impellers with inclined flat blades (pitched blade impellers).
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Fořt, Ivan, Jiří Hájek, and Václav Machoň. "Energetic efficiency of two impellers on the same shaft in a cylindrical baffled vessel of high height/diameter ratio." Collection of Czechoslovak Chemical Communications 54, no. 9 (1989): 2345–56. http://dx.doi.org/10.1135/cccc19892345.
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The paper deals with the experimental study of the indicating particle circulation and the impeller power input in a liquid mechanically agitated with two high-speed impellers (combination of the standard turbine impeller and the six inclined (at 45°) plane blades impeller) on the same shaft in a slender vessel (its height is equal double of the vessel diameter) equipped with four radial baffles at its walls under the turbulent regime of agitated charge flow. By the visual method of the indicating particle it is examined its circulation in the lower part of the system pumping effect of the lower impeller), its circulation in the upper part of the system (pumping effect of the upper impeller), and the exchangeable circulation between the upper and lower part of the system and vice versa. The impeller power input is ascertained from the measured current electricity in the anchor of the direct current driving motor. It follows from the calculated energetic efficiency (the ratio of the cube of the sum of the impeller flow rate numbers and the sum of the impeller power numbers) of the investigated combinations of impellers that the highest value of this quantity is exhibited for two standard turbine impellers on the same shaft and for a combination of the lower standard turbine impeller and the upper impeller with inclined plane blades pumping upwards; slightly less value of the impeller energetic efficiency appears for the combination of two impellers with six inclined plane blades, the upper one pumps liquid upwards and the lower one downwards. For all the configurations the vertical distance of impellers on the same shaft has to be longer than the vessel diameter.
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Zhou, Xin, Yongxue Zhang, Zhongli Ji, and Hucan Hou. "The Optimal Hydraulic Design of Centrifugal Impeller Using Genetic Algorithm with BVF." International Journal of Rotating Machinery 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/845302.
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Derived from idea of combining the advantages of two-dimensional hydraulic design theory, genetic algorithm, and boundary vorticity flux diagnosis, an optimal hydraulic design method of centrifugal pump impeller was developed. Given design parameters, the desired optimal centrifugal impeller can be obtained after several iterations by this method. Another 5 impellers with the same parameters were also designed by using single arc, double arcs, triple arcs, logarithmic spiral, and linear-variable angle spiral as blade profiles to make comparisons. Using Reynolds averaged N-S equations with a RNGk-εtwo-equation turbulence model and log-law wall function to solve 3D turbulent flow field in the flow channel between blades of 6 designed impellers by CFD code FLUENT, the investigation on velocity distributions, pressure distributions, boundary vorticity flux distributions on blade surfaces, and hydraulic performance of impellers was presented and the comparisons of impellers by different design methods were demonstrated. The results showed that the hydraulic performance of impeller designed by this method is much better than the other 5 impellers under design operation condition with almost the same head, higher efficiency, and lower rotating torque, which implied less hydraulic loss and energy consumption.
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Raskov, V., M. Sharapov, and E. Blank. "Development of technology for electron beam welding of impellers of centrifugal pumps for ships and offshore structures operated in the Arctic." Transactions of the Krylov State Research Centre 3, no. 397 (August 6, 2021): 133–40. http://dx.doi.org/10.24937/2542-2324-2021-3-397-133-140.
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Object and purpose of research. Centrifugal equipment is widely used in various sectors of industry. One of the main part of centrifugal equipment is the impeller. Application of impellers in shipbuilding is a promising field, in particular for fail-free operation in harsh Arctic environment. The purpose of this study is development of manufacturing processes for impellers involving electro-beam welding (EBW) without soldering alloys and final thermal treatment. Materials and methods. The main material chosen for the impeller is the high-strength cold-resistant steel 10ХН3МД. Main results. In the process of technology development, the impeller design was chosen. Welding conditions were optimized on mock-up samples modeling the T-joint of cover plate with vane. Sample tests and investigation were done. Conclusions were made regarding the follow-on work and EBW introduction. Conclusion. EBW technology for manufacturing of impellers was developed making it possible to fabricate impellers of high-strength cold resistant materials, including difficult-to-weld materials.
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Wang, Y., S. Komori, and Z. Xu. "Design and Performance Prediction of Centrifugal Impellers." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 210, no. 6 (December 1996): 463–76. http://dx.doi.org/10.1243/pime_proc_1996_210_073_02.
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This study presents a simple method for designing the blade geometry of a centrifugal compressor impeller. In this method, instead of giving the mean swirl distribution on the meridional surface, the blade angle distribution is specified and the blade shape is derived, making it easier to perform the design. The quasi-three-dimensional potential flow field inside the impeller is obtained using the streamline curvature method, which solves the Euler equation along arbitrary quasi-orthogonals. The viscous effect is incorporated indirectly into the inverse design of the impeller via the simplified three-dimensional boundary layer calculation and the performance prediction. A three-dimensional centrifugal impeller was designed using this inviscid-viscous method and eventually manufactured. The newly designed impeller (B) and another impeller (A) designed previously were tested on a standard apparatus for model impellers. With the aid of three-hole probes and thermocouples, the flow parameters downstream of the exit of the impellers were measured along the axial direction of the impellers. A viscous loss model related to the boundary parameters is developed and used for the performance predictions of the impellers together with other loss models. From both the boundary layer analysis and the performance prediction, it is concluded that impeller B is superior to impeller A, which is in close accordance with the measurements.
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Stelmach, Jacek, Radosław Musoski, Czesław Kuncewicz, Tomas Jirout, and Frantisek Rieger. "Efficiency of PBT Impellers with Different Blade Cross-Sections." Energies 15, no. 2 (January 14, 2022): 585. http://dx.doi.org/10.3390/en15020585.
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In this study, the mixing power and the axial and radial velocity distributions were determined for the standard PBT45-6 impeller with inclined blades and for three NACA impellers with airfoil blades. On the basis of the velocity distributions obtained by means of PIV techniques, the pumping efficiency and the size of the secondary circulation for the tested impellers were determined. The next stage was to calculate the efficiency of the impeller operation, in which the comparative criteria were the values of the mixing energy in the form of a dimensional and dimensionless criterion. The lowest mixing energy was obtained for impellers with symmetrical profiled NACA0021 blades, which was 20% lower than the similar mixing energy obtained for the standard PBT45-6 impeller.
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Skrzypacz, Janusz, and Marcin Bieganowski. "Investigations of drilled and multi-piped impellers cavitation performance." Open Engineering 9, no. 1 (July 20, 2019): 246–52. http://dx.doi.org/10.1515/eng-2019-0032.
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AbstractThe industry needs the rotodynamic pumps operating with ultra-low specific speed and relatively low flow rate more often. Designing of such structures on acceptable efficiency level is extremely difficult and require nonstandard approach to design as for example: drilled impeller or patented by author multi-piped impeller. Such pump elements are very easy to manufacture and operate with relatively high efficiency, but cavitation behavior is unknown.This paper focuses on experimental research in order to determine the cavitation characteristics of the drilled impellers and multi-piped impellers. The test rig was presented. Impeller models were made by means of SLS Rapid Prototyping methods. Additionally, CFD calculations were presented in order to determine static pressure distribution in the inlet sections of the investigated impellers.
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Salakhov, Rishat, Andrey Ermakov, and Elvira Gabdulkhakova. "Numerical and Experimental Study of the Impeller of a Liquid Pump of a Truck Cooling System and the Development of a New Open-Type Impeller." Tehnički glasnik 14, no. 2 (June 11, 2020): 135–42. http://dx.doi.org/10.31803/tg-20200309115417.
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Typically, closed-type impellers are more efficient than open-type impellers, but in the manufacture of closed-type impellers, cost of wheels is higher. This paper describes the development of cost-effective and simple impeller wheel for a fluid pump in the truck cooling system. To perform this task, the numerical computations of a standard impeller wheel were carried out, its characteristics were also obtained from a test bench, the standard impeller wheel model was verified. The open-type impeller wheel was developed according to the current dimensions of standard impeller wheel and then analyzed with the numerical computations by the software ANSYS CFX (Academic license) computational fluid dynamics. The developed open-type impeller wheel works very effectively in spite of performance degradation by 5% in comparison to the closed-type impeller wheel. When working as a part of engine, the pump efficiency is 0.552-0.579. The maximum value of the pump efficiency is 0.579, it can be achieved at the highest speed of the pump (4,548 rpm and 655 l/min).
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Wang, Yuefang, Sujing Wang, and Lihua Huang. "Random Vibration Analysis for Impellers of Centrifugal Compressors Through the Pseudo-Excitation Method." International Journal of Computational Methods 12, no. 04 (August 2015): 1540002. http://dx.doi.org/10.1142/s0219876215400022.
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Impellers of centrifugal compressors are generally loaded by fluctuating aerodynamic pressure in operations. Excessive vibration of the impellers can be induced by unsteady airflows and lead to severe fatigue failures. Traditional transient stress analyses implemented in time domain generally require multiple load-step, very time-consuming computations using input of temporal pneumatic force previously obtained from Computational fluid dynamics (CFD) analyses. For quick evaluation of structural integrity of impellers, it is necessary to develop random vibration models and solution approaches defined in frequency domain. In this paper, the Pseudo-Excitation Method (PEM) is used to obtain power spectral density of three-dimensional, dynamic displacement and stress of impellers. A finite element model of an unshrouded impeller of a centrifugal compressor is generated based on the result of unsteady CFD analysis. Compared with the direct transient stress analyses in time domain, the pseudo-excitation method provides accurate and fast estimation of dynamic response of the impeller, making it an applicable and efficient method for analyzing random vibration of impellers.
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Dzhurabekov, Alisher, Jaloliddin Rashidov, Aleksandr Gazaryan, Boybek Kholbutaev, Shakhnoza Mansurova, and Norpulat Tashmatov. "Improving impeller and water flow section of vane pumps." E3S Web of Conferences 365 (2023): 03002. http://dx.doi.org/10.1051/e3sconf/202336503002.
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As a result of the research, it was found that the blades of the working impellers of the pumps are eroded at the inlet and outlet. Based on software studies, the points of erosion caused by cavitation and sand particles at the entrance of the impeller and the points of operation of the impeller under heavy load have been determined. The operating points under heavy load are compared with working impellers in nature. After comparison with software developments, it is determined that they are compatible with working impellers in natural conditions. The following impeller model is recommended to reduce cavitation and erosion processes in the impeller (Figures. 6, 10). The recommended impeller is shown in the inlet of the impeller to free water entry, prevent water shortage, and reduce the level of cavitation. (Figures 6, 10, 11). The ingress of water into the impeller is freed, the continuous movement of water is restored, and the methods of preventing the processes of decay and holes formed in the impeller are given. Recommended methods of significantly reducing the level of wear in the input and output parts of the impeller are given.
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Manshoor, Bukhari, Afifah Yusof, Suraya Laily, Izzuddin Zaman, and Amir Khalid. "An Effect of Fractal Baffles and Impellers with Double Stage 4-Blade Rushton Turbine to Fluid Flow Behaviour in Stirred Tank." Applied Mechanics and Materials 660 (October 2014): 816–22. http://dx.doi.org/10.4028/www.scientific.net/amm.660.816.
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The stirred tank is widely used in many industries to obtain the desired type of fluid mixing. In the context of mixing process, two different fluids and have a different properties will mix in a single equipment to produce another fluid with a new property. In this research, a new approach of stirred tank which is containing a new design of baffles and impellers was proposed for fluid mixing. The new design of baffles and impellers that proposed here are used a fractal pattern for both parts in the stirred tank. Implementing a fractal pattern for baffles and impellers in stirred tank believe will influence the flow characteristic inside the stirred tank, hence will improve a mixing performance. In order to investigate the kinds of flow properties, a Particle Image Velocimetry (PIV) technique with 1 μm seeding particle was used. Four configurations were tested which are normal baffles and normal impellers, normal baffles and fractal impellers, fractal baffles and normal impellers, and the last configuration is fractal baffles and fractal impellers. In this study, dual Rushton impellers with 4 blades were used with the configurations mentioned. The result shows the significant flow field capture by PIV measurement on each configuration. By using fractal impeller some vortex are shown in the tank and high velocity vector on flow field compare with normal impeller while normal baffles gives high velocity vector depends on the configuration were used. From the results, it was showed that the fractal design can give a certain level of mixing efficiency in stirred tank. The PIV technique also gives good flow visualization in order to determine the flow pattern in stirred tank with a new concept of baffles and impellers.
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Shoji, H., and H. Ohashi. "Lateral Fluid Forces on Whirling Centrifugal Impeller (1st Report: Theory)." Journal of Fluids Engineering 109, no. 2 (June 1, 1987): 94–99. http://dx.doi.org/10.1115/1.3242647.
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Lateral fluid forces acting on a rotating centrifugal impeller in whirling motion are analyzed using unsteady potential flow theory. Impellers operating in diffusers with and without vanes are modeled and the fluid forces calculated for different whirl speeds and flow rates. The influences of these parameters are clarified by parametric calculations. The results for whirling impellers operating in vaneless diffusers show that the fluid forces exert a damping effect on the rotor whirling motion at all operating conditions. The results for impellers operating in vaned diffusers or guide vanes show that the time averaged values of fluid forces remain almost unchanged, while there are significant instantaneous fluctuations due to the impeller/guide vane interactions.
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Petry, Nico, Jörg Hartmann, James M. Sorokes, and Mark J. Kuzdzal. "Recent test experiences with applying multiple unshrouded impellers in a single-shaft compressor." Journal of the Global Power and Propulsion Society 8 (March 8, 2024): 1–12. http://dx.doi.org/10.33737/jgpps/177603.
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The use of unshrouded impellers to increase the pressure ratio and volume reduction achieved in low mole weight, single-shaft compressor applications is discussed. The aerodynamic and mechanical implications of using multiple unshrouded impellers in series is also addressed. Test results will show that with proper management of impeller tip gaps good aerodynamic performance can be achieved with three unshrouded impellers in a single process section. The development effort also leveraged a knowledge-based impeller design system to provide new impeller designs that were optimized as a function of Mach number to provide a 30% axially shorter section without compromising aerodynamic performance. The shorter axial stages in the first section pushed the rotor natural frequency 20% higher, enabling faster rotor tip speeds. Test results from a single-stage test rig and from a full-size prototype testing are provided and generally show good agreement.
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Rieger, František, Tomáš Jirout, Dorin Ceres, and Pavel Seichter. "Effect of Impeller Shape on Solid Particle Suspension." Chemical and Process Engineering 34, no. 1 (March 1, 2013): 139–52. http://dx.doi.org/10.2478/cpe-2013-0012.
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Abstract This paper deals with the effect of impeller shape on off-bottom particle suspension. On the basis of numerous suspension measurements, correlations are proposed for calculating the just-suspended impeller speed for a standard pitched four-blade turbine and three types of hydrofoil impellers produced by TECHMIX for several particle sizes and for a wide range of particle concentrations. The suspension efficiency of the tested impellers is compared with the efficiency of a standard pitched blade turbine on the basis of the power consumption required for off-bottom suspension of solid particles. It is shown that the standard pitched blade turbine needs highest power consumption, i.e. it exhibits less efficiency for particle suspension than hydrofoil impellers produced by TECHMIX.
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Yi, Ling, Zhi Peng Li, Yan Hui Chen, and Shun Jun Hong. "The Influence of the Number of Impeller’s Blade on the Performance of Multistage Centrifugal Pump." Advanced Materials Research 781-784 (September 2013): 2851–56. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.2851.
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Abstract: In order to understand the relationship between the number of blade and the performance of the self-balance multistage centrifugal pump’s first stage impeller internal flow characteristics, Reynolds Navier-Stokes equation and κ~ε turbulence model are used for numerical simulation. The objects of numerical simulation are five self-balance multistage centrifugal pump’s first stage impellers, the blade number of them is 4，5，6，7，8.Under the rated flow ,the numerical simulation obtain five kind of impeller inner flow field distribution , Through the comparative analysis ,when the number of blade is 4,8,the flow of the impeller’s inner and pressure distribution become chaos ;And, the number of blade is 5,6,7, With the increase of blade number, the impeller internal flow are smoother，the head and efficiency are enhanced correspondingly.
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Malik, Adil, and Qun Zheng. "Effect of double splitter blades position in a centrifugal compressor impeller." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 233, no. 6 (August 8, 2018): 689–701. http://dx.doi.org/10.1177/0957650918792462.
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This paper reveals a novel design of centrifugal compressor impeller with multisplitter blades for performance improvement. In order to investigate the effects of the location of the splitter between two main blades, two sample impellers were designed, keeping all flow conditions and impeller definitions same as the experimentally validated impeller: (1) with big splitter close to suction surface of main blade and smaller splitter close to pressure surface; (2) with small splitter close to suction surface of main blade and big splitter close to pressure surface. Flow field in both the impellers is analyzed and compared with the original experimentally validated impeller. Total pressure ratio is increased with improved efficiency in multisplitter blade impellers with the addition of pair of big and small splitters blades. It was identified that small splitter close to the suction surface of the main blade and big splitter close to the pressure surface has more uniform flow, reduced separation, and better efficiency than the placement of big splitter close to the suction surface.
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Knížat, Branislav, Dušan Šlachtič, and Róbert Olšiak. "Effect of Impeller Size on the Performance of a Single Blade Pump." MATEC Web of Conferences 369 (2022): 02006. http://dx.doi.org/10.1051/matecconf/202236902006.
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Changing the impeller diameter is a frequently used method for adjusting pump performance parameters. In the case of conventional multi-blade impellers, this is done by reducing the diameter on the machine tool to the prescribed shape. The other dimensions of the pump (diffuser, inlet) remain unchanged. This method is called trimming. The article deals with the diameter reduction and subsequent modification of the performance parameters of a single blade pump. These pumps are characterized by certain specific features. First of all, it is an unsymmetrical impeller that must be both statically and dynamically balanced. This plays an essential role in the whole modification process. Research results obtained on a pump with an impeller diameter of 138 mm are presented. The change in diameter was monitored on a total of 3 impellers. Experiments were carried out in the laboratory of hydraulic machinery. The results were verified by CFD calculations. Research background: The article concerns the modification of impellers of single blade pumps. The effects of diameter modifications on multi-blade pumps are currently known. However, these have symmetrical impellers and can therefore be changed without restriction. For asymmetric (single blade) impellers, the problem is more complex as additional mass must be added to provide static and dynamic balance. Purpose of the article: The aim is to determine the nature of the change in performance parameters when the output diameter is changed. The results of the research can be applied in the prediction of the change in the operating point and the creation of tombstone charts. Methods: Two kinds of methods were used in the research: experiment and CFD calculation. A total of 4 impeller sizes were investigated. Findings & Value added: The results of the paper can be divided into two areas. In the experimental area, a device was designed to measure the characteristics of single blade pumps. Four impellers were manufactured and tested. In the area of CFD calculations, simulations of the hydraulic parameters around the best efficiency point (BEP) were performed. The calculation results were verified by experiment. The nature of the change of the BEP when the diameter of the impeller changes up to 87.9 % was found.
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Zhuang, Haifei, Mingming Liu, and Yongding Wu. "Study on Impeller Configuration Strategy of Dredger Pump with Different Conveying Distance." Journal of Physics: Conference Series 2329, no. 1 (August 1, 2022): 012019. http://dx.doi.org/10.1088/1742-6596/2329/1/012019.
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Abstract For DN850 dredge pumps of 3,500 m3/h series cutter suction dredger, on the premise of not changing the impeller size, by changing the parameters of impeller blade to reduce the head of dredge pump, special new impellers for inboard pump and submerged pump are designed; The flow field of the dredge pump is analyzed by numerical simulation. There is no vortex in the impeller channel and near volute tongue, which indicates that the hydraulic performance is excellent; At the flow rate of 10,000 m3/h, compared with the original impeller, the head of the two pumps in series with new impellers is reduced by 23 m, and the efficiency is close to that before modification, reaching more than 85%; This paper analyzes the matching between the dredger pump and the pipeline under three kinds of common sandy mud. By comparing the unit power consumption and productivity, it obtains the suitable conveying distance range of special new impellers of dredger pumps, and forms the impeller configuration scheme of 3,500 m3/h series cutter suction dredger with different conveying distance, which provides guidance for dredging engineering.
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Kuncewicz, Czesław, and Jacek Stelmach. "Optimization of geometric parameters of a ribbon impeller." Chemical and Process Engineering 38, no. 3 (September 1, 2017): 491–502. http://dx.doi.org/10.1515/cpe-2017-0038.
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Abstract Geometric parameters of a ribbon impeller were optimized on the basis of numerical calculations obtained from the solution of our own 3D/2D hybrid model. The optimization was made taking into account mixing power and homogenization time for ribbon impellers with a different number of ribbons and width operating in a laminar motion for Newtonian fluid. Due to minimum mixing energy required to stir a unit volume of liquid the most efficient impeller appeared to be that with one ribbon of width equal to 0.1 to 0.15 of the mixing vessel diameter. Impellers with more than one ribbon needed much higher mixing power but did not increase significantly secondary circulation in the vessel. These impellers increased first of all primary circulation, i.e. they increased only circular motion of liquid in the vessel.
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Zariatin, D. L., Shanti Kumbarasari, and Dwi Rahmalina. "The Performance of Pump as Turbine with Machined Impellers." MATEC Web of Conferences 159 (2018): 02024. http://dx.doi.org/10.1051/matecconf/201815902024.
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Pump as turbine (PAT) is a type of micro hydro power plant, which uses a commercial pump as a turbine in order to generate electricity. Most of PAT facilities used centrifugal pump. The main component of the pump is impeller, which commonly produced by using casting process. However, this paper describes a manufacturing process to produce PAT impeller by using machining process. Four impellers were produced from two variations of materials (brass and AA-7075), each with 5 and 6 blades. The impellers were tested in a laboratory scale PAT power-plant facility, and the performance of each impeller was compared to its original impeller. The experiment results show that the impeller with 6 blades made of brass material improves 48.9% of power generated.
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Fasano, Julian, Eric E. Janz, and Kevin Myers. "Design Mixers to Minimize Effects of Erosion and Corrosion Erosion." International Journal of Chemical Engineering 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/171838.
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A thorough review of the major parameters that affect solid-liquid slurry wear on impellers and techniques for minimizing wear is presented. These major parameters include (i) chemical environment, (ii) hardness of solids, (iii) density of solids, (iv) percent solids, (v) shape of solids, (vi) fluid regime (turbulent, transitional, or laminar), (vii) hardness of the mixer's wetted parts, (viii) hydraulic efficiency of the impeller (kinetic energy dissipation rates near the impeller blades), (ix) impact velocity, and (x) impact frequency. Techniques for minimizing the wear on impellers cover the choice of impeller, size and speed of the impeller, alloy selection, and surface coating or coverings. An example is provided as well as an assessment of the approximate life improvement.
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Harada, H. "Performance Characteristics of Two- and Three-Dimensional Impellers in Centrifugal Compressors." Journal of Turbomachinery 110, no. 1 (January 1, 1988): 110–14. http://dx.doi.org/10.1115/1.3262155.
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The overall performance of two- and three-dimensional impellers of a centrifugal compressor were tested and compared. A closed-loop test stand with Freon gas as the working fluid was employed for the experiments. The inlet and outlet velocity distributions of all impellers were measured using three-hole cobra probes. As a result, it has been revealed that three-dimensional impeller in terms of efficiency, head coefficient, and operating range. Further, it has also been clarified that the impeller slip factor is affected by blade angle distribution.
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Liu, Kaicheng, and Cheng Yan. "Investigation of the Influence of Splitter Blades on the Resonance Conditions of Impellers." Applied Sciences 9, no. 10 (May 18, 2019): 2051. http://dx.doi.org/10.3390/app9102051.
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The conventional resonance conditions are derived based on the conventionally designed impellers without splitter blades. This paper proposes the resonance conditions for impellers under the excitation from the impeller–diffuser interaction with attention paid on the influence of splitter blades. A lumped parameter model is established and the modal analysis is carried out. The blade-based representative modal vector (RMV) is defined. The influence of splitter blades on the impeller’s traits of modes is investigated by analyzing the spatial harmonic contents of the RMV. Then, given the specific form of the diffuser-induced engine order excitation acting on the main and splitter blades, the resonance conditions are derived. Tuned and mistuned cases are provided for a practical impeller. The resonance conditions are verified by harmonic response calculations. The applications of the proposed resonance conditions in resonance identification and hazard evaluation of different excitations are given. The differences between the proposed resonance conditions and the conventional ones are discussed. The research indicates that even the RMV of the tuned impeller contains two harmonic components due to the existence of splitter blades. When the excitation frequency equals the natural frequency of the impeller and the excitation order matches with either harmonic index of the two harmonics, the resonance occurs. The results of case studies show that the harmfulness of various engine orders of excitation can be exactly evaluated by the joint use of the spatial harmonic contents analysis result and the proposed resonance conditions; however, analyzing based on the conventional resonance conditions may lead to the misjudgment of the harmfulness of the excitations.
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Rosa, Henrique M. P., and Bruno S. Emerick. "CFD simulation on centrifugal pump impeller with splitter blades." Revista Brasileira de Engenharia Agrícola e Ambiental 24, no. 1 (January 2020): 3–7. http://dx.doi.org/10.1590/1807-1929/agriambi.v24n1p3-7.
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ABSTRACT The present paper aims to present the analysis and comparison of results of computational simulations using Computational Fluids Dynamics (CFD) in impellers of centrifugal pump. Three impellers were simulated: 1) original impeller, 2) original impeller with splitter blades at outlet; 3) original impeller with splitter blades at inlet. The splitters occupied 30% of the length of the main blades. They were simulated using the ANSYS-CFX software system in 1500 rpm rotational speed and at different flow rates. The turbulence model assumed was the Shear Stress Transport (SST). The results were used to build impeller blade head curves, besides the presentation of pressure distribution and streamline behaviour inside the impeller. It was verified that the insertion of the splitter blades reduced the impeller blade head, mainly the impeller with outlet splitter, whose reduction was more intense.
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Chen, Yiming, Ce An, Rongyong Zhang, Qiang Fu, and Rongsheng Zhu. "Research on Two-Way Contra-Rotating Axial-Flow Pump–Turbine with Various Blade Angles in Pump Mode." Processes 11, no. 5 (May 18, 2023): 1552. http://dx.doi.org/10.3390/pr11051552.
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In tidal two-way contra-rotating units, significant differences in performance often occur when arranging the front and rear impellers, which requires an optimized design of the impellers. To solve this problem, by reducing the blade inlet and outlet angles, the impact of different blade angles on the performance of two-way pump–turbines and the internal flow was explored, and the effects of the blade inlet angle of the impellers on the performance of the counter-rotating pump were obtained. Afterward, the streamline and vorticity of the two-stage impeller at different angles were analyzed. The results show that different blade angles will have a certain impact on the internal flow of the two-way pump–turbine. Different blade outlet angles have a significant impact. The variation in different inlet blade angles is not significant for the vorticity changes in the front impeller and rear impeller. In addition, changes in the outlet blade angle will have an impact on the location of LE impact water of the rear impeller, which in turn affects the contours of vorticity of the rear impeller near LE, which also means that the vorticity in this area is mainly dominated by the vortex stretching term.
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Podbolotov, Sergey, Anatoly Kolga, and Natalja Dyorina. "Mathematic simulation of the power interchange in the interbucket space of coaxially located impellers of the centrifugal turbo machine." MATEC Web of Conferences 224 (2018): 04016. http://dx.doi.org/10.1051/matecconf/201822404016.
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The article presents the results of mathematic simulation to determine the effect of geometric parameters, coaxially installed impellers, a centrifugal turbo machine on the developed pressure, depending on the mode of operation (frequency and relative direction of the impellers rotation). It is established that irrespective of the operation mode, the influence of the circumferential velocity, the ratio of the input and output diameters and the width of the impeller on the value of the pressure developed by the turbo machine is invariable. While the influence of the density of the blades system decreases with the counter rotation of the impellers.
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Gölcü, M., N. Usta, and Y. Pancar. "Effects of Splitter Blades on Deep Well Pump Performance." Journal of Energy Resources Technology 129, no. 3 (January 18, 2007): 169–76. http://dx.doi.org/10.1115/1.2748810.
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Impellers with splitter blades have been used in turbomachinery design for both pumps and compressors. Increasing the number of blades increases the head of the pump, however, it causes a decrease in efficiency due to the blockage effect of the blade thickness and friction. The impellers with splitter blades between two long blades can be used to alleviate the serious clogging at the inlet of the impeller caused by more blades. In this study, impellers having a different number of blades (z=3, 4, 5, 6, and 7) with and without splitter blades (25, 35, 50, 60, and 80% of the main blade length) were tested in a deep well pump. The effects of the main blade number and lengths of splitter blades on the pump performance have been investigated. While the number of main blades and the lengths of the splitter blades of a principal impeller were changed, the other parameters such as pump casing, blade inlet and outlet angles, blade thickness, impeller inlet and outlet diameters, were kept the same.
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Iancu, Florin, John Trevino, and Steven Sommer. "Numerical Analysis of Blade Geometry Generation Techniques for Centrifugal Compressors." International Journal of Rotating Machinery 2007 (2007): 1–7. http://dx.doi.org/10.1155/2007/48683.
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It is a known fact that machined impellers result in improved compressor performance compared to cast impellers of the same design. The performance improvements can be attributed to better surface finish, more accurate geometric definition (tighter dimensional tolerances), well-defined edges, and the lack of blade tip fillet on shrouded impellers. In addition, it has been observed through experimental investigations that the construction method of the impellers has an impact on performance. This paper presents computational fluid dynamic investigations of two types of impellers, with blade surfaces generated using straight-line elements (SLEs) and CAD arbitrary definitions. Because there are many different mathematical definitions that CAD tools employ for curves, the resulting arbitrary blade surface is not unique. The numerical results will help understand the causes of the performance differences as well as the effects of SLE blades on the flow through the impeller. Input conditions for computational dynamic simulations are based on experimental results. All references to experimental data in the present paper are for cast impellers. Therefore, the differences in performance are attributed to blade definition (SLE versus other) and not to differences resulting from manufacturing methods.
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Epple, P., B. Karic, Č. Ilić, S. Becker, F. Durst, and A. Delgado. "Design of radial impellers: A combined extended analytical and numerical method." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 223, no. 4 (March 26, 2009): 901–17. http://dx.doi.org/10.1243/09544062jmes1196.
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The use of high-speed radial impellers is very common in blowers for industrial application. It is also very common to manufacture these impellers using circular arc blades. The design process as well is almost always based on former impeller series and experimental data available. In this work, a method is presented to improve the efficiency of radial impellers with a combined analytical and numerical method. This method is based on an extended analytical formulation of the flow in radial impellers, allowing optimizing efficiency in the design stage. It is complemented by the mathematical implementation of a well-known qualitative principle of efficiency optimization according to Carnot. Finally, the torque-speed characteristic of the motor is included in the design stage. The blade shapes are computed using an inverse method. The design is then validated by means of computational fluid dynamics (CFD) computation with a commercial solver. Finally, a prototype was built and measurements were carried out in a test rig. It is also shown that the design method provided very good predictions leading to an efficiency increase of 13 per cent and a maximum flowrate increase of 11 per cent. The design point was also met. It is also shown that the numerical computations and measurements are in good agreement. An analysis of the CFD results is also presented, giving an insight view into the substantial flow information within the old and the new impellers. The method presented is a combined analytical and numerical method suited to design high-efficiency radial impellers considering also the torque-speed characteristic of the motor without the need of a previous impeller series or knowledge of experimental data.
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Borisenko, Valeriy, Serhiy Ustenko, Iryna Ustenko, and Kateryna Kuzma. "Development of a method for geometric modeling of centrifugal compressor impellers." Eastern-European Journal of Enterprise Technologies 1, no. 1 (109) (February 19, 2021): 35–42. http://dx.doi.org/10.15587/1729-4061.2021.224924.
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The practice of designing centrifugal compressors in which impellers are the main components shows that there are reserves for their further improvement. One of the main reserves consists in improving flow conditions for the compressed medium in the compressor setting and, above all, in the impeller. A method of geometric modeling settings of the impellers of centrifugal compressors was proposed which involves the construction of meridional boundaries of impellers and the blade profile on an involute of the cylindrical surface of the outer radius of the impeller. The blade is represented by ruled surfaces. The outer boundary of the impeller is described by a curve in natural parameterization using cubic dependence of curvature on the arc length. Dependences and length of the arc are determined in the process of modeling the boundary based on the set source data. The problem is solved by minimizing deviations of intermediate curves from the boundary endpoint. The inner boundary is obtained as an envelope of circles inscribed in the meridional channel of the impeller. Radii of the circles are determined taking into account the flow areas of the channel. The midline of the blade profile on an involute of the cylindrical surface of the outer radius of the impeller is modeled using a curve that is presented in natural parameterization with quadratic law of curvature distribution. A computer code was developed in the Fortran Power Station programming environment that visualizes the obtained numerical results graphically on a computer display in addition to digital information on the modeled boundaries and the blade profile. Graphical results were presented. They confirmed the efficiency of the proposed method of modeling the settings of centrifugal compressor impellers. The method can be useful to offices involved in the design of centrifugal compressors
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Sanghirun, Witthawat, and Wanchai Asvapoositkul. "Comparative design and performance of surface water irrigation pumps for smallholder farmers in South and Southeast Asia." Journal of Mechanical Engineering and Sciences 16, no. 3 (September 28, 2022): 9025–32. http://dx.doi.org/10.15282/jmes.16.3.2022.05.0714.
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An experimental study on the performance of various Thai irrigation pump impellers and a newly design conical hollow-shaped impeller was investigated. They were tested experimentally. The design pump based on a similar theory was developed. The objectives of this experiment were to provide data for comparison of Thai irrigation pump impellers, to evaluate, and to improve the current design of Thai irrigation pumps in a cost-effective and energy-efficient manner. The efficiency and design variables of Thai irrigation pump impellers were presented as a function of dimensionless specific speed in the range, 2.1 < Ns < 4.1. The geometric and design variables as functions of the specific speed and the specific diameter or Cordier diagram presented in this paper could be used as a practical design guide for Thai irrigation pump impellers. This is a preliminary design phase of Thai irrigation pump impellers and the result from this study is intended to make a modest contribution. However, they are facing new challenges that require pump performance improvement and innovative design.
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Han, Yan Jun, Xiao Hui Zhi, and Wen Wu Guo. "Manufacture of the Wear Corrosion Resistance High-Cr Cast Iron Impeller." Advanced Materials Research 97-101 (March 2010): 983–86. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.983.
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A wear corrosion resistance high-Cr cast iron was introduced in this paper, and the cast forming technique of 150ZGB impeller was also presented. The produced impellers, according to the technique, met the quality demands, such as no crack, surface smoothness, and high hardness. The service life of the impellers, in phosphoric acid slurry condition, were 4 to 6 times as long as that made from UB6 (0Cr20Ni25Mo5).
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Kalinkevych, M., V. Ihnatenko, O. Bolotnikova, and O. Obukhov. "Design of high efficiency centrifugal compressors stages." Refrigeration Engineering and Technology 54, no. 5 (October 31, 2018): 4–9. http://dx.doi.org/10.15673/ret.v54i5.1239.
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The modern trend in compressor industry is an extension of the use of multi-shaft centrifugal compressors. Multi-shaft compressors have a number of advantages over single-shaft. The design of such compressors gives opportunity to use an axial inlet for all stages and select the optimum rotational speed for each pair of impellers, which, along with the cooling of the gas after each stage, makes possible to achieve high levels of efficiency. The design of high-efficiency centrifugal compressor stages can be performed on the basis of highly effective stage elements. Such elements are: impellers with spatial blades, vaned and channel diffusers with given velocity distribution. In this paper, impellers with axial-radial blades are considered. The blade profile is determined by the specified pressure distribution along the blade. Such design improves the structure of the gas flow in the interblade channels of the impeller, which leads to an increase in its efficiency. Characteristics of loss coefficients from attack angles for impellers were obtained experimentally. Vaned and channel diffusers, the characteristics of which are given in this article, are designed with the given velocity distribution along the vane. Compared to the classic type of diffuser, such diffusers have lower losses and a wider range of economical operation. For diffusers as well as for impellers, characteristics of loss coefficients from attack angles were obtained. High efficient impellers and diffusers and obtained gas-dynamic characteristics were used in the design of a multi-shaft compressor unit for the production of liquefied natural gas. The initial pressure of the unit is 3bar. The obtained characteristics of loss coefficients from attack angles for the considered impellers and diffusers make it possible to calculate the gas-dynamic characteristics of high-efficient centrifugal compressors stages. The high-efficient centrifugal compressors stages can be designed using high-efficient elements, such as: impeller with spatial blades and vaned diffuser with given velocity distribution.
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Senoo, Y., and M. Ishida. "Pressure Loss Due to the Tip Clearance of Impeller Blades in Centrifugal and Axial Blowers." Journal of Engineering for Gas Turbines and Power 108, no. 1 (January 1, 1986): 32–37. http://dx.doi.org/10.1115/1.3239882.
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The pressure loss based on the tip clearance of impeller blades consists of the pressure loss induced by the leakage flow through the clearance and the pressure loss for supporting fluid against the pressure gradient in the channels and in the thin annular clearance space between the shroud and the impeller. Equations to evaluate these losses are derived and the predicted efficiency drop is compared with experimental data for two types of centrifugal impellers. Furthermore, the equations are simplified for axial impellers as a special case, and the predicted efficiency drop is compared with the experimental data for seven cases in the literature. Fair agreement demonstrates plausibility of the present model.
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Luo, Hongying, Ran Tao, Jiandong Yang, and Zhengwei Wang. "Influence of Blade Leading-Edge Shape on Rotating-Stalled Flow Characteristics in a Centrifugal Pump Impeller." Applied Sciences 10, no. 16 (August 14, 2020): 5635. http://dx.doi.org/10.3390/app10165635.
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Rotating stall, which is a common phenomenon in turbomachinery, strongly relates to the flow rate condition. In centrifugal impellers, rotating stall was induced by the incidence angle on blade leading-edge at partial-load. The blade leading-edge shape also influences the rotating stall because of the subtle change of local flow-field. In this study, the influence of blade leading-edge shape on rotating-stalled flow characteristics was studied in a six-blade centrifugal pump impeller. The stall pattern was “alternating”: Three passages were stalled, three passages were well-behaved, and the stalled and well-behaved passages occurred alternately. The stalled flow characteristics can be studied without the interruption of stall cell movement. Four types of blade leading-edge (blunt, sharp, ellipse, and round) were numerically compared based on the initial typical impeller and the numerical–experimental verification. The numerical comparison shows that the leading-edge shape has a strong influence on the stalled flow pattern, velocity, pressure, turbulence kinetic energy, and flow-induced noise inside impellers. The blunt and sharp leading-edge impellers had a similar internal pattern; the ellipse and round leading-edge impellers were also similar in the internal flow-field. Pressure pulsation analysis showed more obvious differences among these impellers. The main frequency and the pulsation peak–peak values were completely different because of the slight leading-edge shape differences. It revealed the impact of leading-edge geometry on the transient flow-field change under the same incidence angle conditions. It also provided reference for influencing or controlling the rotating stall by blade profile design.
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Li, Ziliang, Xingen Lu, Ge Han, Yanfeng Zhang, Shengfeng Zhao, and Junqiang Zhu. "The performance of a centrifugal compressor with a tandem impeller in off-design conditions." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 2 (May 29, 2019): 156–72. http://dx.doi.org/10.1177/0957650919848614.
Full textAbstract:
Centrifugal compressors often suffer relatively low efficiency and a terrible operating range particularly due to the complex flow structure and intense impeller/diffuser interaction. Numerous studies have focused on improving the centrifugal compressor performance using many innovative ideas, such as the tandem impeller, which has become increasingly attractive due to its ability to achieve the flow control with no additional air supply configurations and control costs in compressor. However, few studies that attempted to the investigation of tandem impeller have been published until now and the results are always contradictory. To explore the potential of the tandem impeller to enhance the compressor performance and the underlying mechanism of the flow phenomena in the tandem impellers, this paper numerically investigated a high-pressure-ratio centrifugal compressor with several tandem impellers at off-design operating speeds. The results encouragingly demonstrate that the tandem impeller can achieve a performance enhancement over a wide range of operating conditions. Approximately 1.8% maximum enhancement in isentropic efficiency and 5.0% maximum enhancement in operating range are achieved with the inducer/exducer circumferential displacement of [Formula: see text] = 25% and 50%, respectively. The observed stage performance gain of the tandem impellers decreases when the operating speed increases due to the increased inducer shock, increased wake losses, and deteriorated tandem impeller discharge flow uniformity. In addition, the tandem impeller can extend the impeller operating range particularly at low rotation speeds, which is found to be a result from the suppression of the low-momentum fluid radial movement. The results also indicate that the maximum flux capacity of the tandem impeller decreases due to the restriction of the inducer airfoil Kutta–Joukowsky condition.