Zeitschriftenartikel: „Pump parameters“

1

Othman, N., N. S. Mohd Shah, K. G. Tay, N. A. Cholan und R. Talib. „The effect of pump parameters on dual-pump fiber optical parametric amplifier“. MATEC Web of Conferences 150 (2018): 01010. http://dx.doi.org/10.1051/matecconf/201815001010.

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The impact of pump parameters on dual-pump (2-P) fiber optical parametric amplifier (FOPA) is investigated. The four-wave model of coupled amplitude equations with fiber losses and pump depletion are solved numerically for the calculation of the parametric gain. Simulation results indicate that an increase in pump powers does not only enhances the parametric gain but also flattening the amplification bandwidth. Moreover, separating the pumps wavelengths further from each other can also improve the flatness of the bandwidth. Besides that, the parametric gain flatness can be improved when the separation between the pump central wavelength and zero-dispersion wavelength is small. In essence, the optimal performance of 2-P FOPA can be achieved when the pump parameters are carefully tailored.

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Demikhov, K. E., und A. A. Ochkov. „On the Method of Calculating Diffusion Vacuum Pump Stage Pumping Parameters“. Herald of the Bauman Moscow State Technical University. Series Mechanical Engineering, Nr. 2 (137) (Juni 2021): 85–93. http://dx.doi.org/10.18698/0236-3941-2021-2-85-93.

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At present, steam jet vacuum pumps are widely used in various fields of science and technology due to a number of advantages, e.g., reliability, relative simplicity of design, and manufacturability, over other pumping means. The paper analyzes the existing mathematical models of working processes, methods for calculating the pumping parameters of steam-jet vacuum pumps. The problem of improving these methods, which are used in the design, is still urgent. The study attempts to further develop the models in order to increase their practical significance for the pumps design: in particular, the processes of pumping by the first stages of a diffusion pump are considered, since it is they that determine the efficiency of the pump as a whole. Analytical dependences for calculating the main pumping parameters of widely used diffusion vacuum pumps are presented. The obtained equations are a certain clarifying correction of the known provisions on this topic. Findings of research are of practical importance for the design of modern steam-jet vacuum pumps

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3

Zhang, Bowen, Li Cheng, Chunlei Xu und Mo Wang. „The Influence of Geometric Parameters of Pump Installation on the Hydraulic Performance of a Prefabricated Pumping Station“. Energies 14, Nr. 4 (16.02.2021): 1039. http://dx.doi.org/10.3390/en14041039.

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A prefabricated pumping station is a new type of pumping station that plays an important role in the construction of sponge cities in developing countries. It solves the problem of urban water-logging and makes great contributions to the sustainable development of water resources. In order to research the influence of different installation positions of pumps on the internal hydraulic performance of a prefabricated pumping station, based on ANSYS software, the computational fluid dynamics (CFD) numerical simulation method was used to analyze the internal flow state of the prefabricated pump station. In this research, the optimal geometric parameters of pump installation in a prefabricated pumping station are given. The results show that when the distance between the connecting line of two pumps and the center of the sump is L = 0.2 R, the distance between the two pumps is S = 0.6 R, and the suspension height of the two pumps is H = 0.6 D, the internal flow pattern of the prefabricated pump station is better. (R is the cross-sectional radius of the sump and D is the diameter of the nozzle of the pump horn.) These research results have certain guiding significance for improvement of the hydraulic performance and operation efficiency of prefabricated pump stations. They also provide a theoretical basis for parameter selection for prefabricated pumping stations.

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Dubei, O. Ya. „The Influence of the Jet Pump Geometry on its Main Technological Parameters“. Prospecting and Development of Oil and Gas Fields, Nr. 4(73) (30.12.2019): 24–34. http://dx.doi.org/10.31471/1993-9973-2019-4(73)-24-34.

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In order to test the operational efficiency of jet pumps which are installed at different depths in artificial lift-ed oil wells, it is necessary to establish the relation between their geometry and the maximum achievable operat-ing parameters. For this purpose, a series of experimental laboratory studies is conducted. Their main task is to identify the optimal parameters of a jet pump that works with gas-liquid flows. In the experimental setup, the fluid is supplied by an electric centrifugal pump and the air is injected by a compressor. The setup provides the possibility to regulate the fluid pressure before and after the jet pump, as well as the pressure and gas supply at its inlet. The basic parameters of the setup are calculated according to the criteria of the resemblance to real wells. The influ-ence of the jet pump geometry on its working parameters is estimated by replacing its main elements (nozzle, mix-ing chamber, diffuser). For each of the suggested designs of the jet pump, the pressure and the flow rates in its main cross-sections are measured and their measurement values are compared. On the basis of this comparison the author finds the main regularities for choosing optimal geometry which provides maximum gas offtaking or minimum pressure losses. The basic results of the experimental study are presented in the form of graphical dependencies which allow to make conclusions about the operational efficiency of jet pumps.

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Pourtaghi, Adel, und Heidar Pouladi. „Numerical Investigation of The Effect of The Number of Blades of The Impeller On The Performance of Centrifugal Pumps“. Mapta Journal of Mechanical and Industrial Engineering (MJMIE) 2, Nr. 1 (20.04.2018): 1–7. http://dx.doi.org/10.33544/mjmie.v2i1.41.

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A centrifugal pump is a pump which uses a rotating impeller for increasing the pressure of a fluid. Fluid flows to pump from the impellers hole and get accelerated by it and flows toward the volute fast from where enters to the outlet of the pump. Having enough knowledge in the field of geometrical parameters has a great effect on improving the designing and making this kind of pumps. The present study intends to take a small step in this field by evaluation of the effect of mentioned parameters and simulation of fluid current in inside the pumps. For reaching to this goal different number of blades in modelled in impellers and the performance of pump in simulated in Ansys CFX software and finally the results of CFD studies are presented as charts and curves.

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Kryzhanivskyy, Ye I., und D. O. Panevnyk. „Optimization of design and mode parameters of the well ejection system“. Oil and Gas Power Engineering, Nr. 1(33) (03.09.2020): 73–80. http://dx.doi.org/10.31471/1993-9868-2020-1(33)-73-80.

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Insufficient energy performance of ejection equipment and a high probability of non-operating modes of its operation reduce the efficiency of downhole jet pumps. The method of determining the design and operating parameters of the well ejection system, which provide the maximum efficiency of the jet pump, is presented. The proposed algorithm for determining the optimal values of the geometric dimensions of the flowing part of the jet pump involves the construction of a series of pressure characteristics for different values of its geometric parameter, the calculation of the efficiency and the determination of the injection ratio and the relative pressure corresponding to its maximum values. During the studies, the main geometric parameter of the jet pump varied in the range from 2 to 6, given that these geometric dimensions are used in jet devices common in the oil industry. The optimal dimensions of the current part of the jet pump are obtained in the process of studying its pressure characteristics, and the optimal dimensions of the washing system of the bit - in the process of studying the characteristics of the hydraulic system. The design of an at-bit ejection system, which allows to increase the mechanical drilling speed, the passage of the bit, to stabilize the moment on the bit, to reduce its level of vibration and to control the antiaircraft angles of the well is considered. The efficiency of using at-bit jet pumps is in the following: an increase in the mechanical drilling speed up to 18.7%, the passage of the bit up to 50.8%. The research established the optimal diameters of the working nozzle, mixing chamber and bit nozzles, the distance between the working nozzle and the mixing chamber, the injection ratio and the relative pressure of the at-bit jet pump. The obtained values of design and mode parameters exclude the occurrence of cavitation modes of operation of the ejection system and allow the operation of jet pumps with maximum efficiency.

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Parolari, P., L. Marazzi, E. Rognoni und M. Martinelli. „Influence of pump parameters on two-pump optical parametric amplification“. Journal of Lightwave Technology 23, Nr. 8 (August 2005): 2524–30. http://dx.doi.org/10.1109/jlt.2005.850018.

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8

Bazhaykin, Stanislav G., Eugeny F. Denisov, Marat Z. Yamilev und Egor А. Tigulev. „Development of bench for investigation of hydraulic characteristics of flow part of shaftless combined pump-electric motor“. SCIENCE & TECHNOLOGIES OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION 10, Nr. 5 (31.10.2020): 550–57. http://dx.doi.org/10.28999/2541-9595-2020-10-5-550-557.

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The stages of creating a brand new shaftless pump unit are considered; including its flow part efficiency tests. The development is aimed at reducing losses caused by design features of existing pumps. A reliable and relatively inexpensive way to choose the optimal design of a pump unit is to perform large scale models tests. The key criterion of the test bench efficiency is the precise determination of the monitored parameters and their characteristics. The authors analyzed the structure of centrifugal pump losses and identified ways to improve the efficiency of pumping units. Principles of testing new pumps were formulated. The main components of the testing equipment are given. The main parameters that allow estimating the efficiency of the hydraulic part of a designed shaftless pump are defined, on the basis of which bench technical solutions are developed. A delivery component sketch is proposed, a flow diagram of a test bench is developed, and the criteria of measured parameters are defined.

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Bogdevičius, Paulius, Olegas Prentkovskis und Marijonas Bogdevičius. „Transmission with Cardan Joint Parametre Influence to Centrifugal Pump Characteristics“. Mokslas - Lietuvos ateitis 9, Nr. 5 (27.12.2017): 559–64. http://dx.doi.org/10.3846/mla.2017.1073.

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Transmission with cardan joints and nonlinear gearbox elements generates vibrations caused by spinning motion of transmission. This affects the pressure and productivity of centrifugal pump. The momentum of centrifugal pump in turn affects dynamic characteristics of transmission. In order to find the effect of transmission elements on centrifugal pump we investigate transmission composed of asynchronous electrical engine, gear box, cardan joint and Ziegler Ultra centrifugal pump. We create mathematical models of transmission and centrifugal pumps and investigate how the dynamic effects of transmission influence productivity centrifugal pump. This model can be applied to study the transmission parameters, effect of intake and outflow parameters on productivity of centrifugal pump and presence of cavitation. The paper includes results and conclusions of mathematical model.

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Mimmi, G., und P. Pennacchi. „INTERNAL LOBE PUMP DESIGN“. Transactions of the Canadian Society for Mechanical Engineering 21, Nr. 2 (Juni 1997): 109–21. http://dx.doi.org/10.1139/tcsme-1997-0008.

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The subject of this paper is the theoretical analysis of the internal lobe pump which is a particular type of positive displacement rotary pump. The main components of the pump are the rotors: usually the outer one is characterised by lobes with circular shape, while the inner rotor profile is determined as conjugate to the other. For this reason the first topic presented here is the definition of the geometry of the rotors starting from the design parameters. The choice of these parameters is subject to some limitations in order to avoid inner rotor undercutting and to limit the pressure angle between the rotors. Now we will consider the design optimisation. The first step is the determination of the instantaneous flow rate as a function of the design parameters. This allows us to calculate two performance indexes commonly used for the study of positive displacement pumps: the flow rate irregularity and the specific flow rate. These indexes are used to optimise the design of the pump and to obtain the sets of optimum design parameters. Finally further considerations are presented regarding the calculation and the use of other performance indexes, the specific slipping and the rotor curvature, which are particularly suitable for giving more elements for the analysis of this case.

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Jiang, Ben Chi, und Jian Bin Wang. „Research on Geometric Model for Solving the Displacement of Vane Pump“. Advanced Materials Research 655-657 (Januar 2013): 7–10. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.7.

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Displacement is one of the most important parameters of vane pump, but the physical meaning of the pumps’ displacement is relatively difficult to understand. A new approach is presented to simplify the calculation process. On the basis of analyzing the working principle of vane pumps, corresponding visual geometric models were separately built, and then the displacement of vane pump can be directly calculated by those models. This method is applicable not only to single-acting pump but to double-acting pump, it shows a novel vision and is easy to master.

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Zhao, Yuanyuan, Xiangyu Si, Xiuli Wang, Rongsheng Zhu, Qiang Fu und Huazhou Zhong. „The Influence and Optimization of Geometrical Parameters on Coast-Down Characteristics of Nuclear Reactor Coolant Pumps“. Processes 7, Nr. 6 (01.06.2019): 327. http://dx.doi.org/10.3390/pr7060327.

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Coast-down characteristics are the crucial safety evaluation factors of nuclear reactor coolant pumps. The energy stored at the highest moment of inertia of the reactor coolant pump unit is utilized to maintain a normal coolant supply to the core of the cooling loop system for a short period of time during the coast-down transition. As a result of the high inertia moment of the rotor system, the unit requires a high reliability of the nuclear reactor coolant pump and consumes considerable energy in the start-up and normal operation. This paper considers the operational characteristics of the coast-down transition process based on the existing hydraulic model of the nuclear reactor coolant pump. With the implementation of an orthogonal test, the hydraulic performance of the nuclear reactor coolant pump was optimized, and the optimal combination of impeller geometrical parameters was selected using multivariate linear regression to prolong the coast-down time of the reactor coolant pump and to avoid serious nuclear accidents.

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Shui, Qingjiao, Ting Jiang, Binghui Pan, Tianxing Yang und Wei Pan. „Numerical Research on Performance of High-Speed Partial Emission Pump“. Shock and Vibration 2021 (18.01.2021): 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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Altyntsev, Ievgenii, und Andrzej Korczak. „Dynamics of the Interaction between Human Circulatory System and Centrifugal Pump as a Left Ventricle Assist Device“. Applied Mechanics and Materials 630 (September 2014): 365–74. http://dx.doi.org/10.4028/www.scientific.net/amm.630.365.

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Mathematical modeling of the complex process in the human cardiovascular system is powerful tool to evaluate the dynamic system response for the parameters change. Widely used continuous flow pumps (Left Ventricle Assist Device - LVAD) interacting with the circulatory system and work parameters of the assist device are changing dynamically. Different parameters of the system affect the pump operating conditions and on the contrary. Mathematical modeling of interaction between the cardiovascular system and mechanical assist device allows to identify the dangerous effects in the pump and system operation, and to eliminate such situations in the practical using of such pumps.

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Lea, J. F., und J. F. Bowen. „Dynamic Measurements of Beam-Pump Parameters“. SPE Production Engineering 7, Nr. 01 (01.02.1992): 113–20. http://dx.doi.org/10.2118/18187-pa.

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Iliasova, NV, SV Nedosekova, AK Rebrov, PA Skovorodko und JJ Roig. „Computational optimization of diffusion pump parameters“. Vacuum 44, Nr. 5-7 (Mai 1993): 745–47. http://dx.doi.org/10.1016/0042-207x(93)90139-2.

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17

Fecser, Nikolett. „Examining Fire Pump Nocchi CB8038T on Cavitation“. Periodica Polytechnica Transportation Engineering 47, Nr. 3 (12.09.2018): 220–24. http://dx.doi.org/10.3311/pptr.12960.

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For the safe operation of pumps, it is essential to examine the operation parameters. Operation deviating from the operational parameters defined by the manufacturers would damage the pumps. The majority of specialists who are experts at pump technology and fluid mechanics are familiar with cavitation and aware of its detrimental effects. Firstly, in my study I will briefly present the cavitation as a phenomenon taking place during operation and its counting method. Then I state the results of our measurements carried out during the operation of a pump built in a system type Nocchi CB8038T. My goal is to call the attention to the proper way of the operation of centrifugal pumps, the cavitation generated during operation as a harmful phenomenon and its development examined in practice by us.

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Shi, Yi, und Hongwu Zhu. „Proposal of a stage-by-stage design method and its application on a multi-stage multiphase pump based on numerical simulations“. Advances in Mechanical Engineering 13, Nr. 1 (Januar 2021): 168781402098731. http://dx.doi.org/10.1177/1687814020987317.

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Rotodynamic multiphase pumps are usually equipped with many compression units to provide sufficient boosting pressure for the transportation of production fluid in gas oil field. It is a challenge to maintain pump performance while flow parameters in each stage vary due to the compressibility of gas-liquid phase. In this article, a stage-by-stage design method is proposed to improve the boosting capability of a multiphase pump. Variations of flow parameters in each stage are investigated based on computational fluid dynamics (CFD) numerical simulation. Available methods to determinate main impeller geometry parameters of impeller are discussed. The stage-by-stage design method is applied on a five-stage multiphase pump when the inlet gas volume fraction (GVF) are 30% and 50% separately. The second stage is modified base on its corresponding inlet flow parameters when inlet GVF is 30% while the second and third stage are modified when inlet GVF is 50%. Flow parameters, pressure distribution and velocity distribution are compared between the original pump and modified pump. Differential pressure of the modified pump increases by 53.72 kPa and 58.57 kPa respectively when inlet GVFs are 30% and 50%. The feasibility of the stage-by-stage design method is verified through the comparison results.

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Tran, Van-The, Bui Trung Thanh, Banh Tien Long, Hoang Quoc Tuan und Duc Toan Nguyen. „Study on the effects of tooth profile design parameters of rotor to performance of vacuum pump“. International Journal of Modern Physics B 34, Nr. 22n24 (25.08.2020): 2040141. http://dx.doi.org/10.1142/s0217979220401414.

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The vacuum pump usually used traditional curves such as the circular, cycloidal curves and their combinations to construct tooth profile. However, to increase efficiency and design flexibility for the vacuum pump, a novel rotor tooth profile for Roots rotor of vacuum pumps is proposed. Which is named “CEIEC” tooth profile and orderly composed of five significant segments, a circular arc for tooth tip, an epicycloid curve with variable extension, an involute, an enveloped epicycloid curve and a conjugated circular arc for tooth root. A numerical example is presented to evaluate the performance indices for proposed vacuum pump, including the hermeticity coefficients of the rotor mesh gap and tip gap.

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Huang, Si, Jing He, Xueqian Wang und Guangqi Qiu. „Theoretical Model for the Performance of Liquid Ring Pump Based on the Actual Operating Cycle“. International Journal of Rotating Machinery 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/3617321.

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Liquid ring pump is widely applied in many industry fields due to the advantages of isothermal compression process, simple structure, and liquid-sealing. Based on the actual operating cycle of “suction-compression-discharge-expansion,” a universal theoretical model for performance of liquid ring pump was established in this study, to solve the problem that the theoretical models deviated from the actual performance in operating cycle. With the major geometric parameters and operating conditions of a liquid ring pump, the performance parameters such as the actual capacity for suction and discharge, shaft power, and global efficiency can be conveniently predicted by the proposed theoretical model, without the limitation of empiric range, performance data, or the detailed 3D geometry of pumps. The proposed theoretical model was verified by experimental performances of liquid ring pumps and could provide a feasible tool for the application of liquid ring pump.

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Ahniar, Nur Hasanah, Hendra Marwazi und Rismarini Yufita. „Comparison of Flowrate and Occlusion in a Vertical Infusion Pump and Horizontal Infusion Pump“. Journal of Electronics, Electromedical Engineering, and Medical Informatics 2, Nr. 1 (05.01.2020): 1–6. http://dx.doi.org/10.35882/jeeemi.v2i1.1.

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Infusion pump is a device used to enter fluid into the patient's body through a continuous. At present there are two types of infusion pumps namely vertical infusion pumps and horizontal infusion pumps. Both infusion pumps have different technologies. The aim of this study is to compare the performance results of the two infusion pumps. Infusion Pump is given 3 different liquid infusions, use 3 parameters flowrate setting (50 ml / h; 100 ml / h; 200 ml / h) and the data collection repeated for 5 times, with 3 minutes time for each parameter. The results of data collection will be tested using the normality test and difference test. Infusion Pump was calibrated first by using the Infusion Device Analyzer to check the condition of the tool. Based on the results of the T-test where the significant value is greater than 0.05, which means that the null hypothesis is accepted while the alternative hypothesis is rejected

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Tyurin, A. V., A. V. Burmistrov, A. A. Raykov und S. I. Salikeev. „Experimental Study of Pumping Condensable Vapors by Oil Free Vacuum Scroll Pumps“. Proceedings of Higher Educational Institutions. Маchine Building, Nr. 2 (731) (Februar 2021): 34–40. http://dx.doi.org/10.18698/0536-1044-2021-2-34-40.

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When operating a vacuum pump, it is often necessary to pump out liquid vapors or vapor-gas media that can condense in its working cavities. To prevent condensation in displacement pumps including scroll pumps, gas ballast device is used. The maximum tolerable water vapor pressure at the inlet and maximum pump capacity by water vapor are the main parameters of a pump with gas ballast device. The highest water vapor pressure at the inlet and the maximum capacity of the oil-free scroll vacuum pump by water vapor were determined experimentally. For this purpose pumping speed, gas flow through the gas ballast device, and gas temperature at the scroll vacuum pump outlet were measured on a specially designed stand. A method for calculating the partial pressure of water vapor in scroll vacuum pumps using a mathematical model of pumping process is proposed. Experimental and calculated results are in good agreement.

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Zhou, Hua, und Wei Song. „Theoretical flowrate characteristics of the conjugated involute internal gear pump“. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, Nr. 4 (11.07.2012): 730–43. http://dx.doi.org/10.1177/0954406212454390.

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The aim of this article is to study the theoretical flowrate characteristics of the conjugated involute internal gear pump. The conjugated involute internal gear pump has a different internal gear, the profile of which is completely conjugated to that of pinion, from the conventional involute internal gear pump. To describe briefly, the former pump is called ‘conjugated pump’ while the latter pump ‘conventional pump’. This structure makes the conjugated pump have smaller volumes of trapped fluid than the conventional pump, which indicates the conjugated pump has a better flowrate performance. Although there have been numerous investigations into gear pumps, none of them have dealt with the conjugated pumps yet. This article presents a systematic study on the theoretical flowrate characteristics of the conjugated pumps. It is expected to obtain some generalized conclusions to guide the design of internal gear pumps. Firstly, a double envelope concept is applied to derive the mathematical models of the conjugated involute internal gear couple. Next, mesh characteristics of the gear couple, which mainly decide the fluid delivery performance of the pumps, are analyzed. Finally, using a control volume approach, the theoretical flowrate characteristics of the pump under different design parameters of gears are investigated. Results show the conjugated pump has a better performance than the conventional one. To design a conjugated pump with good flowrate characteristics, it’s feasible to choose a proper shifting coefficient, a larger tooth number of the pinion, a smaller tooth number of the internal gear, a larger pressure angle and a larger fillet radius, under the condition that no tooth interference occurs.

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Thanapandi, P., und R. Prasad. „A Quasi-Steady Performance Prediction Model for Dynamic Characteristics of a Volute Pump“. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 208, Nr. 1 (Februar 1994): 47–58. http://dx.doi.org/10.1243/pime_proc_1994_208_008_02.

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A performance prediction model generally applicable for volute-type centrifugal pumps has been extended to predict the dynamic characteristics of a pump during its normal starting and stopping periods. Experiments have been conducted on a volute pump with different valve openings to study the dynamic behaviour of the pump during normal start-up and stopping, when a small length of discharge pipeline is connected to the discharge flange of the pump. Such experiments have also been conducted when the test pump was part of a hydraulic system, an experimental rig, where it is pumping against three similar pumps, known as supply pumps, connected in series, with the supply pumps kept idle or running. Instantaneous rotational speed, flowrate, and delivery and suction pressures of the pump were recorded and it was observed in all the tested cases that the change of pump behaviour during the transient period was quasi-steady, which validates the quasi-steady approach presented in this paper. The nature of variation of parameters during the transients has been discussed. The model-predicted dynamic head-capacity curves agree well with the experimental data for almost all the tested cases.

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Zhang, Yu, Sanbao Hu, Yunqing Zhang und Liping Chen. „Optimization and Analysis of Centrifugal Pump considering Fluid-Structure Interaction“. Scientific World Journal 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/131802.

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This paper presents the optimization of vibrations of centrifugal pump considering fluid-structure interaction (FSI). A set of centrifugal pumps with various blade shapes were studied using FSI method, in order to investigate the transient vibration performance. The Kriging model, based on the results of the FSI simulations, was established to approximate the relationship between the geometrical parameters of pump impeller and the root mean square (RMS) values of the displacement response at the pump bearing block. Hence, multi-island genetic algorithm (MIGA) has been implemented to minimize the RMS value of the impeller displacement. A prototype of centrifugal pump has been manufactured and an experimental validation of the optimization results has been carried out. The comparison among results of Kriging surrogate model, FSI simulation, and experimental test showed a good consistency of the three approaches. Finally, the transient mechanical behavior of pump impeller has been investigated using FSI method based on the optimized geometry parameters of pump impeller.

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Matoušek, David, Jiří Hospodka und Ondřej Šubrt. „New Discrete Fibonacci Charge Pump Design, Evaluation and Measurement“. Measurement Science Review 17, Nr. 3 (01.06.2017): 100–107. http://dx.doi.org/10.1515/msr-2017-0013.

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AbstractThis paper focuses on the practical aspects of the realisation of Dickson and Fibonacci charge pumps. Standard Dickson charge pump circuit solution and new Fibonacci charge pump implementation are compared. Both charge pumps were designed and then evaluated by LTspice XVII simulations and realised in a discrete form on printed circuit board (PCB). Finally, the key parameters as the output voltage, efficiency, rise time, variable power supply and clock frequency effects were measured.

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Hou, Ming Wei. „Optimal Design and Experimental Study on 500SM35 Type Centrifugal Pump“. Applied Mechanics and Materials 29-32 (August 2010): 1003–7. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.1003.

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To make the high efficiency and energy-saving centrifugal pump, using multi-objective optimization design to make hydraulic design of the 500SM35 centrifugal pumps, using CFD technology to simulate the three-dimensional turbulence flow in pump, also make performance experiment and cavitation experiment of the 500SM35 centrifugal pump that have been self-developed. Experimental studies have shown that: the 500SM35 centrifugal pump’s prototype performance parameters all beyond design specification.

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Stoliński, J., C. Rosenbaum, W. Flameng und B. Meyns. „The Heart-Pump Interaction: Effects of a Microaxial Blood Pump“. International Journal of Artificial Organs 25, Nr. 11 (November 2002): 1082–88. http://dx.doi.org/10.1177/039139880202501107.

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Background: When we use rotary blood pumps as an assist device, an interaction takes place between the pump performance and the native heart function (native heart influences pump performance and vice versa). The interaction between native heart and rotary blood pump can be useful to predict recovery of the failing heart. Methods: The rotary blood pumps used were microaxial catheter-mounted pumps with an external diameter of 6.4mm (Impella, Aachen, Germany). The pump-heart interaction was studied in five juvenile sheep with a mean body weight of 68.5 ± 8.7 kg. The pumps were introduced via the left carotid artery and placed in transvalvular aortic position. Recorded parameters were pump speed (rpm), generated flow (L/min) and differential pressure (mm Hg) obtained at high frequency rate of data recordings (25 sets of data per second). This allowed continuous analysis of the pump performance during cardiac cycle. Under clinical conditions the interaction was studied in a 60-year-old male, in whom the device was applied due to postcardiotomy heart failure after myocardial infarction. Results: Heart-pump interaction was analyzed based on pump flow differential pressure. This relationship, analyzed continuously during cardiac cycle, presents as a loop. The dynamic contribution of the heart to the flow generated by the pump leads to continuous fluctuation in the pressure head and the creation of hysteresis. The improved function of the failing heart under clinical conditions after seven days of mechanical support was expressed by: increased hysteresis of the loop caused by increased gradient of flow generated during cardiac cycle, a more pronounced ventricular ejection phase that indicates more dynamic heart contribution to the generated flow, and finally increased gradient of the differential pressure during cardiac cycle, caused predominantly by increased aortic pressure and decreased left ventricle pressure during diastolic phase. Conclusions: The heart-pump interaction based on the pump flow-differential pressure relationship can be useful in predicting the possibility to wean the patient from the device.

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Szwemin, Paulina, und Wieslaw Fiebig. „The Influence of Radial and Axial Gaps on Volumetric Efficiency of External Gear Pumps“. Energies 14, Nr. 15 (23.07.2021): 4468. http://dx.doi.org/10.3390/en14154468.

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The design of gear pumps and motors is focused on more efficient units which are possible to achieve using advanced numerical simulation techniques. The flow that appears inside the gear pump is very complex, despite the simple design of the pump itself. The identification of fluid flow phenomena in areas inside the pump, considering the entire range of operating parameters, is a major challenge. This paper presents the results of simulation studies of leakages in axial and radial gaps in an external gear pump carried out for different gap shapes and sizes, as well as various operating parameters. To investigate the processes that affect pump efficiency and visualize the fluid flow phenomena during the pump’s operation, a CFD model was built. It allows for a detailed analysis of the impact of the gears’ eccentricity on leakages and pressure build-up on the circumference. Performed simulations made it possible to indicate the relationship between leakages resulting from the axial and radial gap, which has not been presented so far. To verify the CFD model, experimental investigations on the volumetric efficiency of the external gear pump were carried out. Good convergence of results was obtained; therefore, the presented CFD model is a universal tool in the study of flow inside external gear pumps.

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Wibbels, M., und K. Den Braven. „The Effect of Cyclic Operation of a Horizontal Ground Loop on Ground Coupled Heat Pump Performance“. Journal of Solar Energy Engineering 119, Nr. 1 (01.02.1997): 13–18. http://dx.doi.org/10.1115/1.2871801.

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When the required load for single-speed heat pump is a fraction of its capacity, the heat pump must cycle. Multispeed heat pumps are able to vary their speed, and so cycle much less than single-speed heat pumps. The effect of cyclic operation on the heat pump ground loop and the consequent effect on heat pump performance have been examined. To analyze the effect of cyclic operation on heat transfer within the ground, separate finite element models were written for the ground loop and the surrounding soil. The models were used to compare the operation of the ground loop for single-speed and multispeed systems. Results were used to explore the effects of the pipe length, and to examine parameters which alter the effects of cycling. Parameters included pipe size and percent capacity. Results show that cyclic operation will decrease the performance of the heat pump, based solely on the performance of the ground loop (i.e., the total load remains fixed). It is also shown that as the pipe radius is increased, the effect of cyclic operation decreases, again due to the fluid capacity, and that as percent capacity decreases the cycling penalty increases.

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OPRAN, Constantin Gheorghe, Mircea Pricop und Constantin Teodoru. „Research Regarding Adaptive Design of Gear Pumps Used for Polymeric Products Engineering“. Applied Mechanics and Materials 760 (Mai 2015): 601–6. http://dx.doi.org/10.4028/www.scientific.net/amm.760.601.

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This paper present the results of the researches regarding innovative and adaptive design of gear pumps for engineering of polymeric products with application in production of injection molding machine. It shows the description of gear pump with innovative design and double gear pump – innovative design, highlighting innovative design feature through constructive adaptation depending on requirements, having (30 – 40) % smaller at the axial size, compared to the classic pumps. They highlight the competitive advantages of innovative pumps with superior technological parameters. The paper also shows numerical simulation of technological parameters for pumps in innovative and adaptive variant proving the correctness and the advantages of new variants. Using the innovative variant allows the development a family of gear pumps, single and double, extremely compact, robust, reliable and with low manufacturing costs.

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Xu, Yun, Lei Tan, Shuliang Cao und Wanshi Qu. „Multiparameter and multiobjective optimization design of centrifugal pump based on orthogonal method“. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, Nr. 14 (22.03.2016): 2569–79. http://dx.doi.org/10.1177/0954406216640303.

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Optimization design of centrifugal pumps involving multiple parameters and objectives is a complicated research topic. The orthogonal method is introduced in the present study to find a high efficiency and low cost way in the optimization process of a centrifugal pump. A orthogonal table designation L16(45) is established, in which 16 individuals of impellers are generated with five design parameters: blade wrap angle, blade angles at impeller inlet and outlet, blade leading edge position, and blade trailing edge lean varying at four levels for each parameter. To realize the multiobjective optimization of both pump efficiency and cavitation performance, an integrated factor considering the weight of two objectives is introduced. On the basis of validated computational fluid dynamics (CFD) technique, the range analysis gives the influence order of five parameters and also determines the value of each parameter. Finally, the optimal centrifugal pump is obtained with remarkable superiority on the efficiency of 3.09% rise and cavitation performance of 1.45 m promotion in comparison with the original pump.

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Sato, Yuichi, und J. D. Knight. „Performance Characteristics of Shrouded Rayleigh-Step and Spiral Groove Viscous Pumps“. Journal of Tribology 114, Nr. 3 (01.07.1992): 499–503. http://dx.doi.org/10.1115/1.2920911.

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In this paper the optimum geometrical configurations of a shrouded Rayleigh-step and a spiral groove viscous pump are analyzed. Then their performance characteristics are compared. The geometries and film shapes of these viscous pumps are optimized with respect to flow rate and the design parameters are summarized graphically. The flow rate of the optimized spiral groove viscous pump is approximately 5–10 percent greater than that of the optimized shrouded Rayleigh-step viscous pump.

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Chayka, Denys, Inga Emeljanova, Alexsander Grigoryev und Pavel Andrenko. „Modeling of the Supplying Process of Building Mixture by Using of Peristaltic Concrete Pump“. International Journal of Engineering Research in Africa 38 (September 2018): 46–59. http://dx.doi.org/10.4028/www.scientific.net/jera.38.46.

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Presently constructors use peristaltic concrete pumps for wet shotcreting processes or for transferring the building mixes to the place of their deposit. Fitting the flexible-hose concrete pump with a hydraulic drive allows both making the range of its operating modes much broader and enhancing its reliability. Numerically simulated models of the building mixes feeding processes were developed to design a hydraulic drive to fit the general-service flexible-hose concrete pump and to calculate its basic parameters. Simulation of the building mixes feeding processes gave the characteristic curves of the concrete pump operating parameters, determined the time of ramping the concrete pump up to the steady running mode, and estimated the impact of the transferred mix density and viscosity to the maximal system pressure, supplied power and torque values.

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Rundo, Massimo, und Alessandro Corvaglia. „Lumped Parameters Model of a Crescent Pump“. Energies 9, Nr. 11 (26.10.2016): 876. http://dx.doi.org/10.3390/en9110876.

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Hoffmann, C., R. Walsh, E. Karrer-Mueller und D. Pooke. „Design Parameters for an HTS Flux Pump“. Physics Procedia 36 (2012): 1324–29. http://dx.doi.org/10.1016/j.phpro.2012.06.299.

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Mazanov, Ruslan, und Sergey Tarasyants. „CALCULATION OF PUMP AND PIPE NETWORK PARAMETERS“. Scientific Life 14, Nr. 9 (2019): 1362–74. http://dx.doi.org/10.35679/1991-9476-2019-14-9-1362-1374.

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Markučič, V., S. Krizmanić und F. Volarić. „Optimization parameters of the heart pump design“. IOP Conference Series: Materials Science and Engineering 393 (10.08.2018): 012125. http://dx.doi.org/10.1088/1757-899x/393/1/012125.

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Terebnev, V. V., und T. V. Atamanov. „Calculation of Parameters of Pump Hose Systems“. Пожаровзрывобезопасность 20, Nr. 10 (August 2012): 48–56. http://dx.doi.org/10.18322/pvb.2011.20.10.48-56.

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Tverdokhleb, Igor, Aleksandr Kostyuk und Sergey Sokolov. „Influence of Operation Mode on Efficiency and Life Cycle Cost of Double Suction Pump“. Applied Mechanics and Materials 630 (September 2014): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amm.630.147.

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The widely known fact that the parameters of many pumps are not correspond to systems characteristics which either changed in time or initially were evaluated incorrectly. In this report the main reasons of pumps operation beyond the operation range are presented. Influence of such operation on Life cycle cost. The real cases of inefficient and unreliable pump operation are presented in report. Also the results of retrofitting of pump station are presented.

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Liu, Lei, Fang Qun Wang, Qin Lin Wu, Wen Jue Wu, Kun Xi Qian, Jing Hua Ji, Wen Xiang Zhao, Wei Xing He und Tian Bo Li. „Influence of Impeller Design on Hemolysis of an Axial Blood Pump“. Applied Mechanics and Materials 140 (November 2011): 162–66. http://dx.doi.org/10.4028/www.scientific.net/amm.140.162.

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Compared to centrifugal blood pumps, the high rotating speed of axial blood pumps lead to blood damage more easily. In order to improve blood compatibility of the axial blood pump developed by the authors, traditional method and three-dimensional streamlined method are used for axial impeller design, and rapid prototyping with ABS organic materials are adopted. Finally, hydraulic experiments and hemolysis tests have been conducted. The results reveal that the impeller design and the design parameters (diameter and length) affect the hydraulic performance and hemolysis of the axial pump obviously. The hemolysis index in axial flow impeller pump using traditional method is 0.12, while the minimum value of hemolysis index in the streamlined axial blood pump is 0.06, below the permitted hemolysis value of 0.1.

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Mimmi, G. C., und P. E. Pennacchi. „Involute Gear Pumps Versus Lobe Pumps: A Comparison“. Journal of Mechanical Design 119, Nr. 4 (01.12.1997): 458–65. http://dx.doi.org/10.1115/1.2826390.

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In previous studies we have considered several types of positive displacement rotary pumps and deeply analyzed the generation of the flow rate and the design limits. This has been done in order to evaluate the main performance indexes; one of which, the flow rate irregularity, is related to the possibility that the pump becomes a source of vibration and noise. A second index is the specific flow rate, related to the delivery capacity of the pump. In this paper, following our previous researches, we analyzed internal involute gear pumps and internal lobe pumps, that have similar operations but different performances. The design parameters and the way to optimize the performances are proposed for both cases. Finally a comparison is made between the two types of pumps with optimum design parameters.

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Li, Yan Zhi, Li Huan Gao und Xiao Yang Tang. „The Flow Pulsation Analysis of an External Gear Pump“. Advanced Materials Research 236-238 (Mai 2011): 2327–31. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.2327.

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In this paper, the theoretical flow ripple of an external gear pump is studied for pumps of similar size using different numbers of teeth on the driving and driven gears. External gear pumps with three different types of tooth profiles are studied. Nondimensional flowrates and fluctuation coefficients of gear pumps are discussed. By using the formula, flowrates can be calculated accurately and efficiently. Results indicate that: in the case of the same displacement (except teeth number and tooth width, other parameters of the gear pump are the same) the gear pump flow pulsation decreases with the increasing of the teeth number. We also concluded that changing tooth profiles on the driving and driven gear can get different pulse amplitude of the flow ripple.

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Itkin, G. P., A. A. Drobyshev, O. Yu Dmitrieva, A. S. Buchnev und A. A. Sysoev. „TESTING THE INTERACTION OF HEART LEFT VENTRICLE AND CONTINUOUS-FLOW PUMP ON A MOCK CIRCULATION MODEL UNDER NORMAL AND PATHOLOGICAL CONDITIONS“. Russian Journal of Transplantology and Artificial Organs 17, Nr. 3 (09.10.2015): 43–49. http://dx.doi.org/10.15825/1995-1191-2015-3-43-49.

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Introduction. The preliminary study of new developed pumps for circulatory support on the hydrodynamic circulation model is an important step in the process of their designing. Hydrodynamic circulation models that can closely imitate cardio – vascular system are important to defi ne the range of effective functioning of the pumps under normal and heart disease conditions which is of great importance for defi ning the mode of these pumps in real clinical conditions.The aim of study is to create a new hydrodynamic circulation model of the systemic circulation to study the processes of interaction of heart left ventricle and continuous – fl ow pumps.Materials and methods. The main components of the mock circulation model (arterial and venous blocks) are designed as closed reservoirs with an air bag providing the necessary elasticity value of these reservoirs. The heart left ventricle was simulated with an artifi cial heart ventricle with a pneumatic drive Sinus-IS which allows to change its options in a wide range. As a test pump we used the fi rst native implantable axial pump VISH – 1. In the course of research we made the registration and recording of the basic hemodynamic parameters (pressure, fl ow) with a multichannel module Pumpax for the measurement of pressure parameters.Results. The designed circulation model allows to adequately reproduce the main hemodynamic parameters of the circulatory system in normal (arterial pressure – 110/77 mmHg, left atrium pressure – 7 mmHg and cardiac output – 4.2 l/min) and heart failure conditions (arterial pressure – 79/53 mmHg, left atrium pressure – 15 mmHg and cardiac output – 3.1 l/min). On the circulation model the interaction of heart left ventricle and continuous-fl ow pump in heart failure simulation was studied. The dynamics of the main circulation fi gures is shown under conditions of changing of the pump rotor speed. Meanwhile, the conditions of the closing of aortic valve are identifi ed which is important for theclinical use of this pump. Using a special separately fl exible camera on the pump inlet we modeled phenomena of negative pressure leading to unstable pump operation and reduction of pump fl ow.Conclusion. Characteristics of the developed hydrodynamic circulation model allow us to reproduce parameters of systemic circulation in a wide range and to use it in designing of new pumps for circulatory support.

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Power, Erica, Liang Zhang und David Daniels. „DDEL-16. UNDERSTANDING OPTIMAL CONVECTION-ENHANCED DELIVERY PHYSICO-CHEMICAL INFUSION PARAMETERS: THE ROLE OF BBB EFFLUX PUMPS IN DRUG DISTRIBUTION AND CLEARANCE“. Neuro-Oncology 22, Supplement_3 (01.12.2020): iii286—iii287. http://dx.doi.org/10.1093/neuonc/noaa222.051.

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Abstract BACKGROUND Diffuse midline gliomas harboring the H3K27M mutation are aggressive and universally fatal brain tumors that primarily occur in children. The blood-brain barrier (BBB) prevents many drugs from reaching the tumor at cytotoxic concentrations and efflux pumps found on the epithelial cells of the BBB rapidly pump drugs out of the brain. Convection enhanced delivery (CED) is a drug delivery technique that bypasses the BBB by directly injecting the drug into the tumor site under a pressure gradient. Further clinical implementation of CED requires understanding drug distribution, as optimal drug physico-chemical properties have never been evaluated. METHODS Sprague Dawley rats underwent a single injection of drug by CED to the brainstem with and without an efflux pump inhibitor. Animals were euthanized at 0, 2, 4, 8, 12 and 24 hours. Their brain drug concentration/distribution was analyzed by MALDI-MSI and plasma drug concentration was measured by LC-MS/MS. RESULTS Drug distribution and brainstem concentration were increased following BBB efflux pump inhibition compared to no pump inhibition controls. Additionally, efflux pump inhibition resulted in slower drug clearance for those drugs that are known pump substrates. CONCLUSIONS BBB efflux pump inhibition resulted in a larger volume of distribution, increased drug concentration and slower drug clearance following CED to the brainstem of known efflux substrates.

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Ivanyushin, Arkadiy, Andriy Rudenko und Igor Tverdokhleb. „Replaceable Hydraulic Parts in Spiral Volute Pumps“. Applied Mechanics and Materials 630 (September 2014): 143–46. http://dx.doi.org/10.4028/www.scientific.net/amm.630.143.

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Zhang, Tianxiao, und Nong Zhang. „Vibration Modes and the Dynamic Behaviour of a Hydraulic Plunger Pump“. Shock and Vibration 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/9679542.

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Mechanical vibrations and flow fluctuation give rise to complex interactive vibration mechanisms in hydraulic pumps. The working conditions for a hydraulic pump are therefore required to be improved in the design stage or as early as possible. Considering the structural features, parameters, and operating environment of a hydraulic plunger pump, the vibration modes for two-degree-of-freedom system were established by using vibration theory and hydraulic technology. Afterwards, the analytical form of the natural frequency and the numerical solution of the steady-state response were deduced for a hydraulic plunger pump. Then, a method for the vibration analysis of a hydraulic pump was proposed. Finally, the dynamic responses of a hydraulic plunger pump are obtained through numerical simulation.

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Gavade, Ramesh S., und Suresh M. Sawant. „Parametric Study and Simulation of Horizontal Split Casing Pump by using Computational Fluid Dynamics“. International Journal of Engineering and Advanced Technology 10, Nr. 2 (30.12.2020): 288–92. http://dx.doi.org/10.35940/ijeat.b2000.1210220.

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The pump requirement is required to meet the specified performance parameters means the required pressure (head) and flow, using less power. For water pump applications, periodic maintenance is required to check worn parts such as wear ring, shaft sleeves. In such a case the direct separation case pumps are reliable. If a given work point can meet the range of pumps of the available separate cases, it is necessary to develop a new pump and the upgraded pump should be more efficient with the considered power problems. With the help of computational fluid dynamics, the complex internal flow of the pump in the case of equilibrium separation can be accurately predicted, thus facilitating the construction of the pump. Simulation provides the most complete performance testing and important diagnostic details that help the engineer quickly and increase composition. As a result, the company is able to quickly create new designs such as a fully patented water pump with a patent. Pressure suction can be problematic during operation and operation of centrifugal pumps. Such pressure stimulants are traditionally investigated but quantitative analysis techniques allow these effects to be tested. Numerical analysis is done with a multi-reference framework to predict the flow field within the entire pipeline and impeller.

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Meng, Xian Jun, Tie Xin Hou und Hai Qing Cui. „Optimization Design Method for Production Parameters of Submersible Pump Well of Polymer Flooding“. Advanced Materials Research 997 (August 2014): 69–72. http://dx.doi.org/10.4028/www.scientific.net/amr.997.69.

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Aiming at the design goal of the highest efficiency of the electric submersible pump of polymer flooding and basing on the coordination of the production system of the electric submersible pump well of polymer flooding and taking oil well productivity and parameters of electric submersible pump (displacement, lift, power) of the electric submersible pump as the design parameters, a mathematical model of the optimization design method for the production parameters of the electric submersible pump well of polymer flooding using the nodal system analysis method was established, and through the mathematical model mentioned above, the optimization design method for the production parameters of the electric submersible pump well of polymer flooding was given. The optimization design method mentioned above, taking the electric submersible pump well B1-D4-71 of Daqing Oilfield as an example, was applied. The results indicate that the method mentioned above can make the electric submersible pump work in the high efficiency area after the electric submersible pump well B1-D4-71’s being put into production.

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Jalikop, Shreyas V., Bernhard Scheichl, Stefan J. Eder und Stefan Hönig. „A New Computational Fluid Dynamics Model To Optimize Sucker Rod Pump Operation and Design“. SPE Production & Operations 36, Nr. 02 (11.03.2021): 359–67. http://dx.doi.org/10.2118/201285-pa.

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Summary Artificial lift systems are widely used in oil production, of which sucker rod pumps are conceptually among the simpler ones. The reciprocating movement of the plunger triggers the opening and closing of two ball valves, allowing fluid to be pumped to the surface. Their built-in ball valves are subject to long-time erosion and fail as a consequence of this damage mechanism. Understanding the principal damage mechanisms requires a thorough examination of the fluid dynamics during the opening and closing action of these valves. In this article, we present a fluid-structure interaction model that simultaneously computes the fluid flow in the traveling valve (TV), the standing valve (SV), and the chamber of sucker rod pumps during a full pump cycle. The simulations shed light on the causes of valve damage for standard and nonideal operating conditions of the pump. In particular, our simulations based on real pump operating envelopes reveal that the so-called “midcycle valve closure” is likely to occur. Such additional closing and opening events of the valves multiply situations in which the flow conditions are harmful to the individual pump components, leading to efficiency reduction and pump failure. This mechanism, hitherto unreported in the literature, is believed to constitute the primary cause of long-term valve damage. Our finite element method-based computational-fluid-dynamics model can accurately describe the opening and closing cycles of the two valves. For the first time, this approach allows an analysis of real TV speed versus position plots, usually called pump cards. The effects of stroke length, plunger speed, and fluid parameters on the velocity and pressure at any point and time inside the pump can thus be investigated. Identifying the damage-critical flow parameters can help suggest measures to avoid unfavorable operating envelopes in future pump designs. Our flow model may support field operations throughout the entire well life, ranging from improved downhole pump design to optimized pump operation or material selections. It can aid the creation of an ideal interaction between the valves, thus avoiding midcycle valve closure to drastically extend the mean time between failures of sucker rod pumps. Finally, our simulation approach will speed up new pump component development while greatly reducing the necessity for costly laboratory testing.

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