Journal articles: 'High speed pump'

1

Shui, Qingjiao, Ting Jiang, Binghui Pan, Tianxing Yang, and Wei Pan. "Numerical Research on Performance of High-Speed Partial Emission Pump." Shock and Vibration 2021 (January 18, 2021): 1–11. http://dx.doi.org/10.1155/2021/6697063.

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The high-speed partial emission pump is a small flow and high-head pump, which has been widely used. To study the main factors affecting the performance of high-speed partial emission pumps, numerical simulation methods were used to calculate the performance parameters of high-speed partial emission pumps with and without inducers, and the external characteristic parameters were verified through comparison test values. The results show that the head of the high-speed partial emission pump with inducer is nearly 15 m higher than that of the high-speed partial emission pump without inducer. Considering the influence of air in the high-speed partial emission pump on the working performance, the two-phase flow with different flow rates, different particle sizes, and different concentrations was calculated, and the different liquid phase distributions, liquid phase velocity vector diagrams, and external characteristic curve were compared. The results show that under the same flow condition, the gas-phase particle diameter has the most severe influence on the external characteristic.

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2

Harris, R. M., K. A. Edge, and D. G. Tilley. "The Suction Dynamics of Positive Displacement Axial Piston Pumps." Journal of Dynamic Systems, Measurement, and Control 116, no. 2 (June 1, 1994): 281–87. http://dx.doi.org/10.1115/1.2899221.

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The suction dynamics of axial piston pumps become more critical if the pump is to be used at high speeds. In order to prevent air-release and cavitation from occurring within the pump it is necessary to pressurise the pump inlet. As the speed of a pump is increased, higher boost pressures are required, due to the extra losses incurred through the suction line and portplate at the higher flowrates. However, the lack of data regarding axial piston pump behavior at high speeds creates problems for the system designer in selecting suitable boost conditions and for the pump designer in selecting the portplate configuration that is required to reduce fluid-borne-noise levels. This paper discusses the suction performance of piston pumps, and presents experimental and simulation results exploring the behavior of a high-speed axial-piston pump. Different air-release and cavitation models that are suitable for simulation studies are investigated.

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3

Kamijo, Kenjiro, and Kunio Hirata. "Performance of Small High Speed Cryogenic Pumps." Journal of Fluids Engineering 107, no. 2 (June 1, 1985): 197–203. http://dx.doi.org/10.1115/1.3242460.

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Several small cryogenic pumps for a liquid rocket engine have been made and tested. These pumps have a small impeller and are characterized by high speed and high head. The main design characteristics of these pumps are as follows: stage specific speeds of from 0.0319 to 0.0766, flow rates from 0.016 to 0.0525 m3/s, pressure rises from 4.9 to 26 MPa, rotational speeds from 16,500 to 80,000 rpm, and impeller diameters from 0.083 to 0.146 m. These pumps, when tested, showed higher efficiency even in the range of small stage specific speeds than any previously reported data on other pumps. This tendency was particularly striking with the two-stage pumps. With regard to pump efficiency measurement, it was made clear that adiabatic efficiency was utilizable for the present cryogenic pumps. The relationship between the adiabatic efficiency and ordinary efficiency was also confirmed by a brief calculation and test results.

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Bai, Yuxing, Fanyu Kong, Fei Zhao, Jiaqiong Wang, Bin Xia, and Qianlan Hu. "Experiments and Numerical Simulation of Performances and Internal Flow for High-Speed Rescue Pump with Variable Speeds." Mathematical Problems in Engineering 2018 (July 2, 2018): 1–18. http://dx.doi.org/10.1155/2018/9168694.

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The model pump is a high-speed, high-power pump designed to achieve rapid mine flooding rescue. This study conducted experiments to investigate pump performance curves, including head, efficiency, and power for the following six different rotation speeds: 3000, 3600, 4200, 4800, 5400, and 6000 rpm. Then, the numerical simulation method based on computational fluid dynamics commercial code Ansys was used to present the internal flow of the pump for the six different rotation speeds through steady and unsteady analyses. Results show that the numerical results agree well with experimental data. The designs of outlet and inlet angles of the impeller match each other well at high rotation speeds. The pressure pulsation coefficient Cp in the impeller and the diffuser channel remain constant at the same monitor point under different rotation speed conditions. The varying trend of the pressure-augmented coefficient ΔP indicates that, with the increase in rotation speed, the effect on pressure rise induced by the back part of the impeller channel is more evident than that by the front part. Also, the main frequency components of ΔP are concentrated on the region with low frequency. Moreover, the rotation speed has no significant effect on ΔP in the diffuser region. This study provides effective guidance and valuable reference for the design of high-speed, high-power pumps.

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Zagar, Philipp, Helmut Kogler, Rudolf Scheidl, and Bernd Winkler. "Hydraulic Switching Control Supplementing Speed Variable Hydraulic Drives." Actuators 9, no. 4 (December 4, 2020): 129. http://dx.doi.org/10.3390/act9040129.

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Primary control of linear motion by variable speed electric motors driving a hydraulic cylinder via a constant displacement pump is an established and successful concept with a frequent use in industry. One problem arises when low or zero motion speed has to be realized under high pump pressure conditions. Such load scenarios occur frequently in certain pressing processes, e.g., for sintering or veneering. Most pumps have a lower speed limit, below which critical tribological conditions occur which impair lifespan and efficiency. In addition, pump speed control and pump fluctuation suffer from the mixed lubrication conditions in such an operation range. For a circumvention of such low speed pump operation, a digital valve control concept is presented and studied in this paper. Valve control is used in load holding phases with low speed. Pressure is provided by an accumulator which is charged by the pump in short charging cycles at reasonable pump speeds. It is shown that the mean control error during load holding phase lies within the desired band and the fluctuations of the control force are lower than those of the pump control. In addition, the unfavorable pump operation conditions can be avoided via digital control.

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6

Liu, Jun, Jian Ping Yuan, and Wei Jie Zhang. "Fluid Mechanics Analysis and Effect of Splitter Blades on the Characteristics of High-Speed Centrifugal Pump." Advanced Materials Research 676 (March 2013): 124–29. http://dx.doi.org/10.4028/www.scientific.net/amr.676.124.

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Due to its single-stage high head, compact structure, convenient maintenance, low cost and high reliability, the high-speed centrifugal pump has been widely used in refining, petrochemical, chemical industry, and aerospace engineering fields. However, as the speed increases, the increasingly high demand for stability is showing and cavitation characteristics of the high-speed centrifugal pump is emerging. Reducing the mechanical vibration, hydraulic losses and improving the pressure distribution of the high-speed pump have become one of the main research fields for high-speed pumps. Three types of splitter blades were designed in this paper. Numerical simulations of the 3D steady flow in the high-speed pump have been carried out by using the software ANSYS CFX 12.0 and the comparative analysis of the velocity, pressure distributions and fluid mechanics in the high-speed pump under three different flow conditions were also carried out，Respectively. The effects of splitter blades on the high-speed pump performance were studied by analyzing both its inner flow field and hydraulic performance. The calculated H-Q curve of the high-speed pump was compared with the test results, and they agreed well with each other. The relative error of head at design conditions was lower than that at the non-design conditions.

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7

Bai, Yuxing, Fanyu Kong, Bin Xia, Fei Zhao, and Yingying Liu. "Effects of Impeller Diameter on High-Speed Rescue Pump." Mathematical Problems in Engineering 2017 (2017): 1–15. http://dx.doi.org/10.1155/2017/1387210.

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Impeller diameter is a crucial design parameter of high-speed rescue pumps because it affects the performance and inner flow characteristics of these pumps. In this study, a pump with an impeller diameter of 248 mm was modeled and its performance was tested. Numerical simulations were conducted under steady and unsteady states, in which the sizes of the impeller diameters were designated as 248 mm (original), 235.6 mm (5% trimmed), 223.2 mm (10% trimmed), and 210.8 mm (15% trimmed). ANSYS software was used to test the shear stress transport (SST k-ω) of the four models, and results agreed well with experimental data. Diameter size affected impeller characteristics in both steady and unsteady states. Subsequently, the differences in performance, hydraulic loss, pressure pulsation, and radial force of the impellers were evaluated. In the performance test, the head and efficiency of the pump decreased as impeller diameter was reduced. The result trends are in accordance with the trim law within the acceptable error range. In terms of hydraulic loss, the impeller and diffuser vane components presented opposite trends with flow rate increase. Finally, in terms of pressure pulsation and radial force, the amplitude diminished while periodicity improved as impeller diameter decreased.

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8

Wu, Xian Fang, Hou Lin Liu, Ming Gao Tan, and Hong Hui Li. "Design and Test for High Specific Speed Mixed Flow Pump with Volute." Advanced Materials Research 354-355 (October 2011): 669–73. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.669.

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The characteristics and research actuality on mixed flow pumps are introduced simplely. A mixed flow pump with volute as diffusion part is designed and its specific speed is 556.8. The axial velocity circulation and blade angle variety with linearity distribution are used to deisign the impeller. The fixed diffeuser between impeller and volute is deigned by arc airfoil.The cross sections of volute are all asymmetry. The commercial code FLUENT is applied to simulate the inner flow in the mixed flow pump and its energy characteristics are predicted according to the simulation results. The inner flow analysis indicates that the flow in the pump is good and the characteristic prediction shows that the pump performance can meet the design demand. The experiment test of the pump are done. When the blade angle is about 0°, the maximum efficiency of the pump is up to 85.76% and the actual efficiency at design point is about 3% higher than demand efficiency. The study fruits can instruct the hydraulic design of higher specific speed mixed flow pump with volute as diffusion part.

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9

Wen, De Sheng, Zhi Li Wang, Shi Jun Lv, Jiang Bo Sun, and Li Bin Du. "Rotational Speed and Noise Level due to Distribution Oil Window Size of Three Type Pumps." Applied Mechanics and Materials 29-32 (August 2010): 1246–51. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.1246.

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In this paper, a new hydraulic pump was presented, called KZB pump which has obtained the national patent of invention (patent number: 85103289.3). Originally comes from CY series pumps that are common used at present, KZB pump shows many advantages, such as high pressure, high efficiency, and long service life etc. This paper focuses on the rotational speed and noise level analysis of this new pump. Firstly, we described the configuration of both semi-open and full-open axial piston pumps in detail, which both of them were all new pumps and the later was also called KZB pump. Next, we investigated the distribution oil window size that influences the pump's rotational speed and noise level mostly by mathematical analysis. Finally, the analysis and comparisons of the rotational speed and noise level performances for the three type pumps which mentioned above were made. It is proved through the test that under the same working conditions KZB pump has made great advanced in controlling noise and having lower self-absorption rotational speed compared with the other type pumps.

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10

Wang, Chun Lin, Chang Jun Li, Jian Ding, and Dong Liu. "Circulation Distribution of High Specific Speed Mixed-Flow Pump." Applied Mechanics and Materials 130-134 (October 2011): 1982–85. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.1982.

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The load distribution of the impeller and the shape of blade bone surface as well as the pump performance are determined by the circulation distribution from the impeller inlet to the outlet. However, perfect conclusions about optimal forms of the circulation distribution have not been seen yet. In this paper, three kinds of circulation distributions were studied. Three mixed flow pump impellers with high specific speed were designed according to the circulation distributions, and the models of the three pumps were built and modeled in the commercial CFD code ANSYS-CFX 11.0. The flow field in the pumps has been investigated using large eddy simulation (LES). Experiment was carried out on one model. And the performance curves predicted by LES were compared with the experimental data, and good agreements were achieved. The results show that: there is a low pressure area at impeller outlet. The pressure distribution along the circumferential direction was asymmetry at the front-end area of guide vanes, but it becomes uniform at the end of guide vane. The bearing pressure on the pressure side of the model 2 is lower, and the pressure distribution of model 1 is more asymmetry and there is a clear low pressure area at outlet of blade; Cavitation performance of model 2 is better, and the maximum efficiency is also the highest, but the hump is more serious; Model 1 has a widest area of high effective area.

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11

Inaguma, Y. "Friction torque characteristics of an internal gear pump." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 6 (April 11, 2011): 1523–34. http://dx.doi.org/10.1177/0954406211399659.

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This paper describes the influence of pump operating conditions, such as operating pressures, pump speeds, and oil temperatures, on the friction torque characteristics of internal gear pumps for automobiles. Additionally, it presents a new mathematical model reflecting the influence of the oil temperature on the friction torque. In an internal gear pump, the friction torque was affected by oil temperature as well as operating pressure and pump speed. When the operating pressure was high, the influence of oil temperature on friction torque at a pump speed of less than 1000 r/min was contrary to that at a pump speed of greater than 1000 r/min. It was considered that the friction torque is fundamentally composed of three components: the component dependent on the operating pressure, dependent on the pump speed, and independent of both the operating pressure and the pump speed. However, the component dependent on the operating pressure was affected significantly by not only the pump speed but also the oil temperature. In addition, another factor besides the viscosity of the oil existed in the component dependent on the pump speed. A mathematical model for the friction torque characteristic of the internal gear pump was newly established by adding factors including the oil temperature to the Wilson’s model. The new model was able to represent with accuracy the experimental friction torque characteristic in the internal gear pump under various pump operating conditions.

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12

Zhang, Rui, Wen Xing Ma, and Xiu Quan Lu. "Modal Analysis of High Power Variable Speed Hydrodynamic Coupling Impellers." Advanced Materials Research 346 (September 2011): 236–40. http://dx.doi.org/10.4028/www.scientific.net/amr.346.236.

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In view of the complex vibration characteristics of hydrodynamic coupling, dynamic analysis of hydrodynamic coupling is carried out by finite element method (FEM), and modal characteristics of pump and turbine which are the most important parts of it are calculated. Modal vibration analysis data of pump and turbine could be obtained by ANSYS software and the natural frequencies of it within different rotational speed is calculated. The result shows that the natural frequencies of pump and turbine are increasing along with enhance of the rotating speed, and it illustrates that rotating centrifugal force could be reinforced natural frequencies of the structure. According to the relationship between exciting force and rotating speed，the critical speeds of pump and turbine are calculated. And the stability operating condition of hydrodynamic coupling must be avoided in each order critical speed of pump and turbine. The research work provides an effective method to analyze the vibration of hydrodynamic coupling. It is suitable for further dynamic analysis and structure optimum design to reduce the vibration of Hydrodynamic coupling.

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13

Hisham, Mohamed W. M., and Sidney W. Benson. "Simple high‐speed circulating pump for gases." Review of Scientific Instruments 60, no. 7 (July 1989): 1349–50. http://dx.doi.org/10.1063/1.1141085.

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14

Solberg, T. A. "THE COFFIN HIGH SPEED BOILER FEED PUMP." Journal of the American Society for Naval Engineers 41, no. 1 (March 18, 2009): 18–29. http://dx.doi.org/10.1111/j.1559-3584.1929.tb03701.x.

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15

Pylev, I. M., and A. K. Malyshev. "Results of investigating high-speed pump-turbines." Hydrotechnical Construction 28, no. 12 (December 1994): 751–54. http://dx.doi.org/10.1007/bf01545838.

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16

Si, Qiaorui, Chunhao Shen, Xiaoke He, Hao Li, Kaile Huang, and Jianping Yuan. "Numerical and Experimental Study on the Flow-Induced Noise Characteristics of High-Speed Centrifugal Pumps." Applied Sciences 10, no. 9 (April 29, 2020): 3105. http://dx.doi.org/10.3390/app10093105.

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The development of low-noise pumps is essential to design quiet fluid delivery systems. Due to the complicated internal flow, the flow-induced noise characteristics of high-speed centrifugal pumps have not been well understood. Taking engine cooling pumps as an example model, experimental measurements are performed in a semi-anechoic room and a CFD/CFA calculation method is proposed to study the fluid-borne noise and radiated noise characteristics. In the speed range of 5000–6750 r/min, both the pump head and the dimensionless radiated noise characteristics conform to similar laws, and the highest efficiency point pump presents the lowest noise level. Consistent with the experimental results, the predicted radiated noise of the model pump presents dipole characteristics at the required flow rate condition. Moreover, the spectrum of fluid borne noise at pump outlet shows broadband characteristics but with obvious discrete peaks, which are not only related to the fluid pressure pulsation characteristics (6f0 and the multiple) at the low-frequency region, but also to the frequency of the structural mode (3000–6000 Hz region). Rotor-stator interaction of the pump flow field between the impeller and volute is the main reason of flow-induced noise; unstable flow also contributes to the broadband components in the noise spectrum.

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17

Yang, Chin Ting. "Hydrodynamic Efficiency Improvement of High-Specific-Speed Centrifugal Pump Impeller." Applied Mechanics and Materials 467 (December 2013): 461–65. http://dx.doi.org/10.4028/www.scientific.net/amm.467.461.

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The high-specific-speed centrifugal pumps are very common in industrial factory for transporting fluids all day long. However, oversized pumps with low performance still could meet the purpose of fluid transporting. The aim of this study was to reduce the existed commercial impeller energy consumption by optimizing the performance of impeller through CAE processes. The impeller model was first generated by BladeGen software and analyzed by CFX in Turbo-mode. The optimized model then exported to machine center to cut the precise aluminum mold. A regular sand die casting processes were used to manufacture the impeller. The original pump which only impeller was replaced with the new one was tested with performance measurement system again. The results show that when the mass flow rate between 40-90kg/s the CFD software predicted very well pump heads and efficiencies with experimental data, which was called optimized impeller. But around the minimum and maximum flow rate region, the recirculation flow between blades and frictional loss model used still need further investigation to shrink the difference. Compare to the original impeller, the optimized one had increased efficiency 6% at the mass flow rate of 80kg/s. Also the high efficiency region (nearby of BEP) of the new impeller had broadened 50%. And the maximum mass flow rate increased 13% than the original one.

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Li, Ying, Xing Chen, Hao Luo, and Jin Zhang. "An Empirical Model for the Churning Losses Prediction of Fluid Flow Analysis in Axial Piston Pumps." Micromachines 12, no. 4 (April 3, 2021): 398. http://dx.doi.org/10.3390/mi12040398.

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The manufacturing development of axial piston pumps usually takes the trend of high speed and miniaturization, and increases power density. Axial piston pumps are usually characterized as high speed to improve the power density; thus, high-speed churning losses caused by the internal rotating components stirring the oil can increase significantly. In order to improve the efficiency, more attention should be given to the churning losses in axial piston pumps, especially in high-speed conditions. Using the method of least-squares curve fitting, this paper establishes a series of formulas based on the churning losses test rig over a wide range of speeds, which enable accurate predictions of churning losses on the cylinder block and pistons. The reduction coefficient of flow resistance of multi-pistons as calculated. The new churning losses formula devoted to the cylinder block and rotating pistons was validated by comparison with experimental evidence in different geometries of axial piston pumps. According to the prediction model of churning losses, some valuable guidance methods are proposed to reduce the energy losses of the axial piston pump, which are the theoretical support for the miniaturization of axial piston pump manufacturing.

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19

Yuan, Ye, Shouqi Yuan, and Lingdi Tang. "Investigation on the effect of complex impeller on vibration characteristics for a high-speed centrifugal pump." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 5 (September 23, 2019): 611–24. http://dx.doi.org/10.1177/0957650919878313.

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In this article, to improve the vibration characteristics of a high-speed centrifugal pump, two new types of complex impeller were designed for replacing the original long-blade impeller. The experimental apparatus of pump vibration was designed and used to test the vibration signals of the model pump with the original impeller in frequency field. The vibration amplitude of 0.12 mm/s2 is observed on the shaft rotating frequency, while the amplitudes of 0.04 mm/s2, 0.14 mm/s2, and 0.2 mm/s2 respectively on the conditions of 0.8 QN, QN, and 1.2 QN appear on the impeller blade passing frequency. The computational fluid dynamics method was used to study internal flow characteristics in the pumps with three impellers for mitigating the pump vibration. Steady pressure nephogram shows big pressure difference existed in the complex-impeller pump, which means that the complex impeller can provide the high-lift water. Addition of the splitter blade can make the pressure-fluctuation amplitude of model pump to reduce obviously by the unsteady time–frequency analyses. Furthermore, two complex impellers were machined and used to conduct the contrast experiment on the vibration characteristics between the pumps with the original impeller and complex impeller. The results reveal that the water head of pump with the complex impeller is higher than that of the original pump, which verifies the simulated results. Meanwhile, the complex impeller has a positive effect on the decrease of pump vibration on the frequency domain, especially on the blade passing frequency the vibration amplitudes decrease by 0.08 mm/s2.

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20

Huang, Yu, Jian Ruan, Yong Chen, Chuan Ding, and Sheng Li. "Research on the Volumetric Efficiency of 2D Piston Pumps with a Balanced Force." Energies 13, no. 18 (September 14, 2020): 4796. http://dx.doi.org/10.3390/en13184796.

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Axial piston pumps with high rotational speeds are required in many fields to increase the power-to-weight ratio. However, three main sliding friction pairs in the pump restrict the increase in rotational speed. To solve this problem, we propose a 2D piston pump with a balanced force that contains a sliding friction pair. Firstly, the mechanical structure and working principle of the pump are described. Then, the pump volumetric efficiency is studied by mathematical modeling, and volumetric losses containing backflow and leakage are analyzed and discussed from the perspectives of load pressure and rotational speed. A test bench that verifies the mathematical model is built to measure the volumetric efficiency of the tested pump. We have found that the increase in rotational speed can help to increase the pump volumetric efficiency, and the mathematical model is consistent with the tested data for 1000 rpm but demonstrates a remarkable difference from the tested data for 3000 rpm. Thus, the temperature field of the pump and the viscosity-temperature characteristics of the oil must be taken into account to increase volumetric efficiency further.

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21

Choi, Young-Do, Junichi Kurokawa, and Jun Matsui. "Performance and Internal Flow Characteristics of a Very Low Specific Speed Centrifugal Pump." Journal of Fluids Engineering 128, no. 2 (September 5, 2005): 341–49. http://dx.doi.org/10.1115/1.2169815.

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In very low specific speed range (ns<0.25), the efficiency of the centrifugal pump designed by the conventional method becomes remarkably low. Therefore, positive-displacement pumps have been widely used for long. However, the positive-displacement pumps remain associated with problems such as noise and vibration and they require high manufacturing precision. Since the recently used centrifugal pumps are becoming higher in rotational speed and smaller in size, there appear to be many expectations to develop a new centrifugal pump with high performance in the very low specific speed range. The purpose of this study is to investigate the internal flow characteristics and its influence on the performance of a very low specific speed centrifugal pump. The results show that large reverse flow at the semi-open impeller outlet decreases absolute tangential velocity considerably which in turn decreases the pumping head.

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Joseph, A., and A. O. Adeoti. "Impact of Fluid Properties on Electric Submersible Pumps (ESP) Performance and Run Life in a Well." Journal of Applied Sciences and Environmental Management 25, no. 2 (April 14, 2021): 139–43. http://dx.doi.org/10.4314/jasem.v25i2.1.

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The primary goal of every operator is to optimally recover reserves at minimal operating costs. Unfortunately, due to inherent primary drive mechanisms that may not be strong enough and poorly designed completion jewelries that increases the complexity of well configurations, most reservoir are not efficiently depleted. This study investigates the impact of fluid properties on electric submersible pumps (ESP) performance and run life in a well. It was observed that the pump speed increases with increase in API gravities and vice-versa. However, decrease in pump speed was observed with crudes having high API gravity from wells with high water-cut (HBSW). High water-cut increases the viscosity of the crude and thus decreases the pump speed. The pump speed also increased as the GOR increases, howbeit, decreased as the GOR exceeds a certain optimum value due to cavitation. The pump intake pressure and the production rate were also investigated. The higher the intake pressure, the higher the pump speed and thus, the higher the production. Well specific models for real-time ESP performance prediction were also developed for each property against the pumpspeed and they exhibited cubic relationships. It was also observed that the quality of the crude significantly affects the performance of ESP’s and therefore, must be checked to prevent early failure and short run life. Keywords: Electric submersible pumps, Fluid properties, Run life, Performance, Failure rate

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Jing, Teng, Yujiao Cheng, Fangqun Wang, Wei Bao, and Ling Zhou. "Numerical Investigation of Centrifugal Blood Pump Cavitation Characteristics with Variable Speed." Processes 8, no. 3 (March 4, 2020): 293. http://dx.doi.org/10.3390/pr8030293.

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In this paper, the cavitation characteristics of centrifugal blood pumps under variable speeds were studied by using ANSYS-CFX and MATLAB software. The study proposed a multi-scale model of the “centrifugal blood pump—left heart blood circulation”, and analyzed the cavitation characteristics of the centrifugal blood pump. The results showed that the cavitation in the impeller first appeared near the hub at the inlet of the impeller. As the inlet pressure decreased, the cavitation gradually strengthened and the bubbles gradually developed in the outlet of the impeller. The cavitation intensity increased with the increase of impeller speed. The curve of the variable speeds of the centrifugal blood pump in the optimal auxiliary state was obtained, which could effectively improve the aortic pressure and flow. In variable speeds, due to the high aortic flow and pressure during the ejection period, the sharp increases in speeds led to cavitation. The results could provide a guidance for the optimal design of the centrifugal blood pump.

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Inaguma, Yoshiharu. "Oil temperature influence on friction torque characteristics in hydraulic pumps." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 9 (December 1, 2011): 2267–80. http://dx.doi.org/10.1177/0954406211430572.

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This article presents a practical approach to the investigation of the influence of oil temperature on the friction torque in various types of hydraulic pumps using a mathematical model. Currently, an external gear, an internal gear or a vane pump is commonly used for an automatic transmission. These pumps have their own friction torque characteristics, which depend not only on pump-operating conditions such as operating pressures, pump speeds and oil temperature but also on structures and dimensions of the pumps. For various pumps, however, the friction torque characteristics can be represented by an identical mathematical model. In the pump-operating conditions, the oil temperature significantly and complicatedly affects them. The pump should be operated under conditions to obtain a higher mechanical efficiency, and the mathematical model is helpful to analyse how the oil temperature influences the friction torque. It is found that with an increase in oil temperature, the friction torque at a high pump speed decreases in a low oil temperature region, but it would not decrease in a high oil temperature region for all the tested pumps. This fact suggests that the pump overall efficiency would not improve at a high oil temperature, even if the volumetric efficiency does not go down.

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Song, Wen-wu, Li-chao Wei, Jie Fu, Jian-wei Shi, Xiu-xin Yang, and Qian-yu Xu. "Analysis and control of flow at suction connection in high-speed centrifugal pump." Advances in Mechanical Engineering 9, no. 1 (January 2017): 168781401668529. http://dx.doi.org/10.1177/1687814016685293.

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The backflow vortexes at the suction connection in high-speed centrifugal pumps have negative effect on the flow field. Setting an orifice plate in front of the inducer is able to decrease the negative effect caused by backflow vortexes. The traditional plate is able to partially control the backflow vortexes, but a small part of the vortex is still in the inlet and the inducer. Four new types of orifice plates were created, and the control effects on backflow vortexes were analyzed. The ANSYS-CFX software was used to numerically simulate a high-speed centrifugal pump. The variations of streamline and velocity vectors at the suction connection were analyzed. Meanwhile, the effects of these plates on the impeller pressure and the internal flow field of the inducer were analyzed. Numerically, simulation and experimental data analysis methods were used to compare the head and efficiency of the high-speed pumps. The results show that the C-type orifice plate can improve the backflow vortex, reduce the low-pressure area, and improve the hydraulic performance of the high-speed pump.

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Soyama, Hitoshi, Shou-Ren Li, Masashi Tonosaki, Kazuo Uranishi, Hiroharu Kato, and Risaburo Oba. "High-Speed Observations of Severe Cavitation Erosion in a High-Specific-Speed Centrifugal Pump." Transactions of the Japan Society of Mechanical Engineers Series B 61, no. 591 (1995): 3945–51. http://dx.doi.org/10.1299/kikaib.61.3945.

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27

Earle, Stephen R. "High speed vacuum pump with reduced exhaust noise." Journal of the Acoustical Society of America 101, no. 5 (1997): 2424. http://dx.doi.org/10.1121/1.418463.

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28

Chhapkhane,, Natu, Narendra. "Design of High Speed and High Head End Suction Pump." International Journal of Innovative Research in Science, Engineering and Technology 04, no. 02 (February 15, 2015): 114–19. http://dx.doi.org/10.15680/ijirset.2015.0402016.

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Kuang, Yishan, Zhi Li, Xi Zhang, Tao Song, Jun Li, Jun Xu, Lihuan Mo, and Kefu Chen. "Effect of turbulence generator structures to the performance of medium-consistency pump at high rotation speed excesses 2000 rpm." Nordic Pulp & Paper Research Journal 35, no. 1 (March 26, 2020): 50–60. http://dx.doi.org/10.1515/npprj-2019-0039.

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AbstractThe medium-consistency (MC) pump is the key unit in modern pulp and paper industry, especially in medium-consistency bleaching plant. Use of MC pump improves the efficiency of bleaching sequences and reduces the pollution load of bleaching effluents. In this work, the component of MC pump, e. g. turbulence generators with three typical structures were studied to evaluate the effects of turbulence generator structure on the performance of MC pump. An automatic control system was built to control operation condition and to collect data online. Head and efficiency were calculated to evaluate the differences among three turbulence generators. The results showed that the linear-type, twist-type and screw-type turbulence generators exhibited similar performance (pump head and efficiency) of MC pump at high rotation speed (2000 rpm to 2900 rpm) compared to the well-known performance of MC pump at rotation speed lower than 2000 rpm which are significant different for the three turbulence generators.

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Palkowski, Carsten, Andreas Zottl, Ivan Malenkovic, and Anne Simo. "Fixing Efficiency Values by Unfixing Compressor Speed: Dynamic Test Method for Heat Pumps." Energies 12, no. 6 (March 18, 2019): 1045. http://dx.doi.org/10.3390/en12061045.

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The growing market penetration of heat pumps indicates the need for a performance test method that better reflects the dynamic behavior of heat pumps. In this contribution, we developed and implemented a dynamic test method for the evaluation of the seasonal performance of heat pumps by means of laboratory testing. Current standards force the heat pump control inactive by fixing the compressor speed. In contrast, during dynamic testing, the compressor runs unfixed while the heat pump is subjected to a temperature profile. The profile consists of the different outdoor temperatures of a typical heating season based on the average European climate and also includes temperature changes to reflect the dynamic behavior of the heat pump. The seasonal performance can be directly obtained from the measured heating energy and electricity consumption making subsequent data interpolation and recalculation with correction factors obsolete. The method delivers results with high precision and high reproducibility and could be an appropriate method for a fair rating of heat pumps.

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31

Zhigarev, D. B., A. V. Lekomtsev, A. E. Gorlov, and A. V. Dengaev. "Experimental studies of the efficiency of high-speed ESPs." E3S Web of Conferences 266 (2021): 01023. http://dx.doi.org/10.1051/e3sconf/202126601023.

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The purpose of the present research paper is to estimate the energy efficiency of ESP-operated low production rate wells (up to 100 m3/d).The data on pumps energy efficiency, including the high-speed ESPs, were consolidated and analyzed. The bench test of high-speed ESPs and comparison with field tests allowed to determine the efficiency adjustment factors and establish functional dependencies of energy parameters on shaft rotation speed;theobtainedcorrelations were suggested for recalculation of nominalvalues in bench tests. The paper also indicates that the average efficiency for the high speed ESPs is 12-17% higher in absolute values and 40-68% higher in relative values, compared with the efficiency of pumps with a nominal rotation speed of 3000 rpm. The suggested approach can be expanded as a methodology for wells with more complex operational conditions and more complex pump systems.

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32

Jafarzadeh, B., A. Hajari, M. M. Alishahi, and M. H. Akbari. "The flow simulation of a low-specific-speed high-speed centrifugal pump." Applied Mathematical Modelling 35, no. 1 (January 2011): 242–49. http://dx.doi.org/10.1016/j.apm.2010.05.021.

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33

Timushev, S. F., and A. A. Frolov. "Automatic Unloading Liquid Rocket Engine Fuel Feed System Booster Pump Radial Thrust Bearings from Axial Force." Proceedings of Higher Educational Institutions. Маchine Building, no. 7 (736) (June 2021): 54–61. http://dx.doi.org/10.18698/0536-1044-2021-7-54-61.

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Increasing the suction capacity, efficiency and energy parameters of high-speed pumps is an important task in the development of power systems in the aerospace industry, as well as in their application in energy and oil production. With improved cavitation properties, the pumps can operate at a higher shaft speed, and at its given value - with lower cavitation reserves, i.e. at a reduced inlet pressure. When the shaft speed increases, the pump weight and overall dimensions decrease. To increase the anti-cavitation qualities of pumps in the power system, auxiliary (booster) pumping units are used, creating the pressure necessary for the cavitation-free operation of high-pressure and high-speed main pumps of the engine fuel supply system. In accordance with its purpose, the booster pump must provide the required supply pressure of the specified flow rate at the lowest possible liquid pressure at the inlet. At the same time, the efficiency of the booster pump unit should be maximum, and the overall dimensions and weight should be minimal. The last two characteristics predetermine the maximum possible number of revolutions of the pump shaft. Ensuring the operability of the ball-bearing supports of the fuel supply units is one of the most important and complex tasks in the development of modern and promising liquid rocket engines (LRE), especially reusable ones. This task has always been one of the priorities in the fine-tuning the fuel feed units of such engines. The article proposes a method for calculating and controlling the unloading liquid rocket engine booster pump radial thrust bearings from axial force. The method can be applied in the entire range of liquid rocket engine calculations. The further development of this work will be mathematical modeling of the operation of the booster pump automatic axial force unloading.

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34

Harris, R. M., K. A. Edge, and D. G. Tilley. "Predicting the Behavior of Slipper Pads in Swashplate-Type Axial Piston Pumps." Journal of Dynamic Systems, Measurement, and Control 118, no. 1 (March 1, 1996): 41–47. http://dx.doi.org/10.1115/1.2801149.

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This paper describes a dynamic model for slipper-pads that allows lift and tilt behavior to be predicted, including the effects of possible contact with the swashplate or slipper retaining plate. This model has been incorporated in the Bathfp simulation package and used to examine the dynamic stability of slipper-pads over the pumping cycle, and to compare the behavior over a range of pump speeds. The centripetal tilting moments acting on the slipper-pad increase with speed and as a consequence can lead to contact between the slipper and the swashplate at high speed. This is particularly likely to occur as the piston makes the transition between suction and delivery, where the pressure forces acting on the piston-slipper assembly change abruptly. The predicted nature of the swashplate contacts at high speeds correspond closely with witness marks on a dismantled pump. The model presented may also be used for predicting slipper behavior in other types of pump, for example, wobble-plate type pumps, or in piston motors.

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35

Zhou, Yang, Shuanghui Hao, and Minghui Hao. "Design and performance analysis of a circular-arc gear pump operating at high pressure and high speed." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 2 (February 10, 2015): 189–205. http://dx.doi.org/10.1177/0954406215572435.

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This paper presents a high-pressure and high-speed gear pump for aerospace application and introduces a circular-arc tooth profile that has no trapping feature and whose gears are in continuous one-point contact in the plane of rotation. Basic dimensions are determined and performance parameters of the gear pump are obtained by structural design of the gear pump. The performance parameters are discussed for different tooth profiles. A disc tool and hob are designed to generate the circular-arc tooth profile. A computer-aided design (CAD) system for the design of the circular-arc gear pump is developed with features of tooth profile design, tool design, and numerical control. The test gears were processed to verify the correctness of CAD system. A study of the outlet pressure of the circular-arc gear pump reveals that the developed high-pressure and high-speed gear pump has low outlet pressure fluctuations.

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36

Yuan, Jian Ping, Yu Wen Zhu, and Ai Xiang Ge. "A CFD Study on Cavitating Flow in High-Speed Centrifugal Pumps under Low Flow Rates." Advanced Materials Research 945-949 (June 2014): 914–23. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.914.

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Cavitation is one of the most important aspects that need to be considered while designing centrifugal pumps, since it is a major contributor to failure and inefficiency. In order to study the cavitating performance in high-speed centrifugal pumps under low flow rates, the pump named IN-32-32-100 with two different impellers was investigated based on numerical and experimental methods. The impeller case 1 is the impeller with six blades. The impeller case 2 is the impeller with four long and four splitter blades. The research results show that the cavities of two impellers occur at the impeller inlet. The region of developed cavities extends and the volume fraction in the blade passages gradually increases with the decrease of inlet total pressure at the flow rate of 0.5Qd. The cavities distribute asymmetrically in each blade passage and the vapor fraction of one blade passage is significantly larger compared with them of blade passages. The inner flow of the pump can be effectively improved with more uniform pressure distribution by applying splitter blades. The critical cavitation number of the impeller case 1 and impeller case 2 corresponding to the sudden head-drop point are 3.2m and 3.55m, respectively. Compared with impeller case 2, cavitating performance of the pump with impeller case 1 is better. The numerical results agree well with the experimental data, which shows that the numerical method in the present study can to some extent accurately predict the cavitating development inside the high-speed centrifugal pump.

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37

Xue, Rong, Yijie Cai, Xufeng Fang, Liang Chen, Xingqun Zhang, and Yu Hou. "Optimization Study on a Novel High-Speed Oil-Free Centrifugal Water Pump with Hydrodynamic Bearings." Applied Sciences 9, no. 15 (July 29, 2019): 3050. http://dx.doi.org/10.3390/app9153050.

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In aerospace fields and industrial sectors, high-speed centrifugal pumps are prevalent and in increasingly strict demand regarding characteristics such as the long life, small volume, light weight, and low noise. In this study, we present a novel high-speed centrifugal water pump with hydrodynamic bearings used to employ work fluid as lubricant. A three-dimensional numerical study of the turbulent fluid flow was carried out to predict the performance of the pump. The computational model was validated against experimental results during hydraulic tests. Additionally, the effect of the blade number on the head and efficiency of the pump was researched. The blade number of the impeller was changed from 4 to 8 and that of the stay vane was from 3 to 14. The results indicate that the blade number and the matching characteristic of the impeller and the stay vane significantly influenced the performance of the pump. The structure based on the seven-blade impeller and the six-blade stay vane had the highest efficiency (30.8%). Numerical investigations of this study may help reduce the significant cost and time of experimental work for a particular design.

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38

Xu, Zhaohui. "UNSTEADY BLADE-ROW INTERACTION CALCULATION IN HIGH SPEED PUMP." Chinese Journal of Mechanical Engineering 40, no. 03 (2004): 1. http://dx.doi.org/10.3901/jme.2004.03.001.

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39

MARUTA, Yoshiyuki, and Hirofumi NAKANIWA. "Noise Quality Control of Small High Speed Water Pump." Proceedings of the Symposium on Environmental Engineering 2001.11 (2001): 135–38. http://dx.doi.org/10.1299/jsmeenv.2001.11.135.

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40

IWASA, Hiroyuki, Jyunichiro FUKUTOMI, Toru SHIGEMITU, and Yasuyuki Nishi. "602 Study of High Specific Speed Mixed Flow Pump." Proceedings of Conference of Chugoku-Shikoku Branch 2009.47 (2009): 185–86. http://dx.doi.org/10.1299/jsmecs.2009.47.185.

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41

Zhang, Chi, Kim K. Y. Cheung, P. C. Chui, Kevin K. Tsia, and Kenneth K. Y. Wong. "Fiber-Optical Parametric Amplifier With High-Speed Swept Pump." IEEE Photonics Technology Letters 23, no. 14 (July 2011): 1022–24. http://dx.doi.org/10.1109/lpt.2011.2151852.

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42

Protopopov, A., and V. Vigovskij. "Development of methods for high-speed centrifugal pump analysis." IOP Conference Series: Materials Science and Engineering 492 (March 13, 2019): 012003. http://dx.doi.org/10.1088/1757-899x/492/1/012003.

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43

Giblin, S. P., S. J. Wright, J. D. Fletcher, M. Kataoka, M. Pepper, T. J. B. M. Janssen, D. A. Ritchie, C. A. Nicoll, D. Anderson, and G. A. C. Jones. "An accurate high-speed single-electron quantum dot pump." New Journal of Physics 12, no. 7 (July 12, 2010): 073013. http://dx.doi.org/10.1088/1367-2630/12/7/073013.

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44

Lin, Yao Lin, Wei Yang, and Ming Sheng Liu. "Central Plant Control Optimization with a Thermal Chilled Water Energy Storage System: A Case Study in a High-Tech Building." Advanced Materials Research 1070-1072 (December 2014): 1989–93. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1989.

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The paper presents the study on the control optimization of the central cooling plant system including thermal chilled water energy storage (TES) tank in a high-tech building consists of office area, clean room and lab space. The optimized control sequences were implemented on the cooling tower staging, cooling tower fan/condenser water pump/primary chilled water pump staging and speed control, chiller staging, TES pump speed and TES modulation valves control, and secondary chilled water loop differential pressure control. The proposed control effectively resolved the problem of fluctuation in the secondary chilled water supply temperature during charging cycle and temperature increase during the discharging cycle. The number of primary chilled water pumps, condenser water pumps and cooling tower fans were also reduced to minimum after the optimization. Implementation of optimized control sequences is predicted to have an annual electricity savings of 856,125 kWh, which is about 20% of the total central plant energy consumption.

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45

Flack, Ronald D., Steven B. Ainley, Klaus Brun, and Leonard Whitehead. "Laser Velocimeter Measurements in the Pump of an Automotive Torque Converter Part II – Effect of Pump Speed and Oil Viscosity." International Journal of Rotating Machinery 6, no. 3 (2000): 181–90. http://dx.doi.org/10.1155/s1023621x00000178.

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The velocity field inside a torque converter pump was studied for two separate effects: variable pump rotational speed and variable oil viscosity. Three-dimensional velocity measurements were taken using a laser velocimeter for both the pump mid- and exit planes. The effect ofvariable pump rotational speed was studied by running the pump at two different speeds and holding speed ratio (pump rotational speed]turbine rotational speed) constant. Similarly, the effect of viscosity on the pump flow field was studied by varying the temperature and]or using two different viscosity oils as the working fluid in the pump. Threedimensional velocity vector plots, through-flow contour plots, and secondary flow profiles were obtained for both pump planes and all test conditions. Results showed that torque converter mass flows increased approximately linearly with increasing pump rotational speed (and fixed speed ratio) but that the flow was not directly proportional to pump rotational speed. However, mass flows were seen to decrease as the oil viscosity was decreased with a resulting increased Reynolds number; for these conditions the high velocity regions were seen to decrease in size and low velocity regions were seen to increase in size. In the pump mid-plane strong counter-clockwise secondary flows and in the exit plane strong clockwise secondary flows were observed. The vorticities and slip factors were calculated from the experimental results and are presented. The torque core-to-shell and blade-to-blade torque distributions were calculated for both planes. Finally, the flow fields were seen to demonstrate similitude when Reynolds numbers were matched.

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46

Tao, Ran, Ruofu Xiao, and Fujun Wang. "Detached eddy simulations for high speed axial flow fuel pumps with swept and straight blade impellers." Engineering Computations 33, no. 8 (November 7, 2016): 2530–45. http://dx.doi.org/10.1108/ec-06-2015-0165.

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Purpose High speed axial flow pumps are widely used in aircraft fuel systems. Conventional axial flow pumps often generate radial secondary flows at partial-load conditions which influence the flow structure and form a “saddle-shaped” region in the Q-H curve that can destabilize the operation. Thus, the “saddle-shaped” Q-H region must be eliminated. The paper aims to discuss these issues. Design/methodology/approach The swept stacking method is often used for radial flow control in turbo-machinery impeller blade design. Hence, this study uses the swept stacking method to design a high speed axial flow pump. The detached eddy simulation method and experiments are used to compare the performance of a swept blade impeller in a high speed axial fuel pump with the original straight blade impeller. Both the pump performance and internal flow characteristics are studied. Findings The results show separation vortices in the impeller with the straight blade design at partial-load conditions that are driven by the rotating centrifugal force to gather near the shroud. The swept geometry provides an extra force which is opposite to the rotating centrifugal force that creates a new radial equilibrium which turns the flow back towards the middle of the blade which eliminates the vortices and the “saddle-shaped” Q-H region. The swept blade impeller also improves the critical cavitation performance. Analysis of the pressure pulsations shows that the swept blade design does not affect the stability. Originality/value This study is the initial application of swept blades for axial flow liquid pumps. The results show how the swept stacking changes the radial equilibrium of the high density, high viscosity flow and the effects on the mass transfer and pressure pulsations. The swept blade effectively improves the operating stability of high speed fuel pumps.

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Chung, Tien Tung, Chih Kang Lu, and Yi Ting Tu. "Design, Manufacturing and Pump-down Curve Simulation of High Vacuum Systems." Applied Mechanics and Materials 220-223 (November 2012): 575–79. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.575.

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This paper presents a vacuum system design for extreme ultraviolet lithography (EUV) and studies the prediction of pump-down curves for vacuum chambers. Related basic theories include gas laws, conductance for several kinds of flow regimes, equivalent length for pipes, outgassing, diffusion, and permeation etc. The simulation program consists of a MFC module and a MATLAB module. The MFC module is used to input necessary parameters, including start and target pressure for pumping, volume and inner surface area of vacuum chambers, configuration of pumping lines, performance of vacuum pumps, and gas loads. The MATLAB module deals with the pump-down curve calculation based on related theories. The governing equation of the conservation of mass in a pumped vacuum chamber is derived from extended Temkin isotherm. The pump-down curve of vacuum chamber is predicted by four steps, including calculation of equivalent length for pipes, conductance of pipes, and effective pumping speed of pumps, and pump-down time. An empty vacuum chamber is used to test the developed program. The pump-down curve reaches 6.5E-8 torr with 42 hours pump-down time in experiment measurement, and the simulated curve reaches 5.79E-8 torr at the same time point. The developed program can predict pump-down curve with a good accuracy in the range from low vacuum pressure to high vacuum pressure.

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Li, Zheng Guo, Qiang Zhang, and Fang Lai Zhu. "The Application Research of Pumps Operation Optimal Control Arithmetic for Saving Energy in SZWG." Applied Mechanics and Materials 278-280 (January 2013): 1627–30. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.1627.

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In order to solve the problem that how to adjust the operation of all units of the pump station and control the speed of pumps on time, in the changing condition of manufacture procedure, to optimize the pumps combination and adjusting-speed strategy, this paper builds a mathematic model of pumps operation control system, adopts the method of system identification to calculate system parameters on-line, and brings forward a optimal control arithmetic for saving energy. The data analysis of running spot indicates that the arithmetic can save energy of pump station obviously, and also has the good function of equipment maintenance, so it has the high engineering application value.

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Li, Ding, Shen, and Jiang. "Performance Optimization of High Specific Speed Centrifugal Pump Based on Orthogonal Experiment Design Method." Processes 7, no. 10 (October 11, 2019): 728. http://dx.doi.org/10.3390/pr7100728.

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A high specific speed centrifugal pump is used in the situation of large flow and low head. Centrifugal pump parameters need to be optimized in order to raise its head and efficiency under off-design conditions. In this study, the orthogonal experiment design method is adopted to optimize the performance of centrifugal pump basing on three parameters, namely, blade outlet width b2, blade outlet angle β2 and blade wrap angle φ. First, the three-dimensional model of the centrifugal pump is established by CFturbo and SolidWorks. Then nine different schemes are designed by using orthogonal table, and numerical simulation is carried out in CFX15.0. The final optimized combination of parameters is b2 = 24 mm, β2 = 24°, φ = 112°. Under the design condition, the head and efficiency of the optimized centrifugal pump are appropriately improved, the increments of which are 0.74 m and 0.48%, respectively. However, the efficiency considerably increases at high flow rates, with an increase of 6.9% at 1.5 Qd. The anti-cavitation performance of the optimized centrifugal pump is also better than the original pump. The results in this paper can provide references for parameter selection (b2, β2, φ) in the centrifugal pump design.

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Lad Kirankumar, H., S. Rekha, and Tonse Laxminidhi. "Low mismatch high-speed charge pump for high bandwidth phase locked loops." Microelectronics Journal 114 (August 2021): 105156. http://dx.doi.org/10.1016/j.mejo.2021.105156.

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Journal articles on the topic 'High speed pump'

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