Academic literature on the topic 'Centrifugal-vortex pump'
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Journal articles on the topic "Centrifugal-vortex pump"
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Makarov, V., V. Potapov, E. Churakov, and N. Makarov. "Ways to improve the energy efficiency of shaft centrifugal pumps." Transbaikal State University Journal 27, no. 5 (2021): 26–35. http://dx.doi.org/10.21209/2227-9245-2021-27-5-26-35.
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The increase in the efficiency and competitiveness of mining enterprises is limited by the insufficient efficiency and adaptability of the currently used centrifugal pumps. Using the vortex theory of turbomachines, Theorems Stokes’ and Helmholtz, the principles of hydrodynamic analogy and superpositions, a mathematical model of the hydrodynamic calculation of centrifugal pumps with adaptive vortex sources integrated into the impeller blades is obtained. A significant influence on the hydrodynamic parameters and adaptability of pumps of the energy characteristics of adaptive vortex sources has been proved. Criteria for the similarity of the hydrodynamic process of fluid flow in the interscapular channels of impellers and adaptive vortex sources and their influence on the hydrodynamic characteristics of pumps are obtained. Mathematical and experimental modeling uses a regression equation to calculate the parameters of vortex chambers and their impact on the efficiency and adaptability of pumps. The optimal geometric parameters of the vortex chambers, the diameter of which does not exceed 5…7 % of the impeller diameter, increase the hydrodynamic loading by at least 13 %, the nominal efficiency. not less than 6 %, adaptability not less than 8 %. On the basis of the proposed developed mathematical model, after the positive test results obtained on the laboratory pump K 20/30, tests were carried out on the CNS 300-300 pump
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Dickinson, Timothy A., Jack Prichard, and Faye Rieckens. "A Comparison of the Benefits of Roller Pump Versus Constrained Vortex Pump in Adult Open-Heart Operations Utilizing Outcomes Research." Journal of ExtraCorporeal Technology 26, no. 3 (1994): 108–13. http://dx.doi.org/10.1051/ject/1994263108.
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The purpose of this study was to compare roller pump and centrifugal pump technologies in routine adult open-heart operations to demonstrate the usefulness of applying a proven method of uniform risk stratification (outcomes research). Objective and readily available preoperative patient data was collected retrospectively on 102 non-randomized and consecutive adult openheart operations. Group 1 consisted of 51 adult open-heart operations utilizing a roller pump for arterial blood perfusion. Group 2 consisted of 51 adult open-heart procedures utilizing a constrained vortex pump for arterial blood perfusion. A comparison between the frequency of occurrence of 53 different preoperative risk factors in the roller pump group and the centrifugal pump group found no statistically significant differences (p < 0.05). Outcome data for the roller pump and centrifugal pump groups included such data comparisons as intensive care unit length of stay (LOS), post operative LOS, total LOS, total patient charge, reimbursement, morbidity, and mortality, which revealed no statistically significant differences (p < 0.05). Further comparison studies of roller pumps versus centrifugal pumps for arterial blood perfusion should incorporate this kind of comprehensive data comparison and analysis to reasonably assure that both pump groups are very similar before outcomes research is performed.
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Pochylý, František, Pavel Jandourek, Simona Fialová, and Pavel Rudolf. "Analysis of the inlet recirculation in centrifugal pumps." IOP Conference Series: Earth and Environmental Science 1483, no. 1 (2025): 012042. https://doi.org/10.1088/1755-1315/1483/1/012042.
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Abstract Conference article is focused on theoretical and practical deepening of knowledge associated with inlet recirculation in centrifugal pumps, especially with higher specific speed pumps. The conditions of instability of the vortex structures and the causes of recirculation are studied theoretically and experimentally. The methodology is based on the analysis of the Navier-Stokes equations for an incompressible fluid depending on the boundary conditions. The result of the theoretical analysis is the design of various types of dampers in the suction part of the pump, to limit the occurrence of recirculation. Their effect is demonstrated experimentally in laboratory conditions. An article presents individual types of the vortex structures depending on the operating parameters of the pump, including its characteristics. The interest of the research is a plastic model of the pump with specific speed nq = 90 rpm which is made by 3D printing technology.
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Pan, Chong Chao, Zheng Qian Feng, Peng Cheng Li, and Hai Hong Chen. "The Research on Energy Saving of Pump Fluid Conveying System." Advanced Materials Research 860-863 (December 2013): 704–8. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.704.
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In order to determine the energy saving effect of the pump system after the energy saving technical reconstruction project implementation, this paper mainly researches on how to measure and verify the pump system energy saving after the energy saving technical reconstruction project implementation for AC drive (drag) centrifugal, mixed flow, axial flow, vortex pumps and reciprocating pumps. This paper also puts forward the related definitions, boundaries, methods, technical requirements of measurement and verification, etc.
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Tu, Yongsha, Xueying Zhao, Lifeng Lu, et al. "Flow Characteristics and Pressure Pulsation Analysis of Cavitation Induced in a Double-Volute Centrifugal Pump." Water 17, no. 3 (2025): 445. https://doi.org/10.3390/w17030445.
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Cavitation is a complex multiphase flow phenomenon, and the generation of transient phase transitions between liquid and vapor during cavitation development leads to multi-scale vortex motion. The transient cavitation dynamics and centrifugal pump’s rotor–stator interaction will induce pressure fluctuations in the impeller and the volute fluid of the centrifugal pump, resulting in a complex flow field structure. Based on the Schnerr–Sauer cavitation model and SST k-ω turbulence model, this paper studies the transient characteristics of the cavitation-induced unsteady flow in the centrifugal pump and the excitation response to the pressure pulsation in the volute under different flow conditions, taking the large vertical double-volute centrifugal pump as the research object. The results indicate the following: As the impeller rotates, in the external excitation response, the jet-wake flow structure at the centrifugal pump blade outlet shows an increase in the blade frequency signal. This is evident near the measurement points of the volute tongue and separator. When severe cavitation occurs, the maximum amplitude at the blade frequency in the volute shifts from the pump tongue (30°) to the downstream of the tongue (45°). The value of fpmax is 3.1 times that when NPSHa = 8.88 m. By applying the Omega vortex identification method, it can be seen that the interaction between the vortices at the blade trailing edge and the stable vortex in the volute tongue undergoes a process of elongation, fusion, separation, and recovery. This represents the downstream influence of the impeller on the volute. When Q = 0.9Qd, the process of the blade passage vortex tail detaching and dissipating in the impeller flow path can be observed, demonstrating the upstream influence of the volute on the impeller.
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Великанов, Н. Л., and В. А. Наумов. "The criterion of energy efficiency in the design of the ship's water supply system." MORSKIE INTELLEKTUAL`NYE TEHNOLOGII)</msg> 1, no. 4(62) (2023): 271–76. http://dx.doi.org/10.37220/mit.2023.62.4.032.
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Рассмотрено судно проекта RDB 63.01, разработанного проектно-конструкторским бюро «Стапель». Тип судна – самоходное сухогрузное судно. Назначение судна – перевозка минерально-строительных материалов, тарно-штучных, навалочных и генеральных грузов, включая зерно и опасные грузы (уголь и сера). В системе водоснабжения судна использован вихревой насос. Вихревые насосы имеют ряд выгодных преимуществ, по сравнению с центробежными насосами. Среди них меньшая масса и размеры, при одинаковых с центробежными насосами величинах подачи и напора. Долгое время именно это преимущество способствовало использованию в судовых условиях применению вихревых насосов. Представлены нагрузочные характеристики вихревого насоса 1.5CWX-2A, центробежного насоса ЦН СМ-3-6, полученные по экспериментальным данным производителя и по эмпирическим зависимостям. Для этих же насосов рассчитаны показатели энергетической эффективности и удельной энергетической эффективности. Приведена диаграмма энергетических затрат на перекачивание воды за рейс судна. Показано, что при проектировании судовых насосных систем целесообразно также принять во внимание показатели энергетической эффективности. The vessel of the RDB 63.01 project, developed by the design bureau "Stapel", is considered. The type of vessel is a self–propelled dry cargo vessel. The purpose of the vessel is the transportation of mineral and construction materials, bulk, bulk and general cargo, including grain and dangerous goods (coal and sulfur). A vortex pump is used in the ship's water supply system. Vortex pumps have a number of advantageous advantages compared to centrifugal pumps. Among them are smaller weight and dimensions, with the same values of supply and pressure with centrifugal pumps. For a long time, it was this advantage that contributed to the use of vortex pumps in ship conditions. The load characteristics of the 1.5CWX-2A vortex pump and the CM-3-6 centrifugal pump obtained from the manufacturer's experimental data and empirical dependences are presented, energy efficiency and specific energy efficiency indicators are calculated for the same pumps. The diagram of energy costs for pumping water during the voyage of the vessel is given. It is shown that when designing marine pumping systems, it is also advisable to take into account energy efficiency indicators.
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Ali-Hikmat Ahmadov, Ali-Hikmat Ahmadov, and Musayev Anar Musayev Anar. "INVESTIGATION OF THE ENERGY CHARACTERISTICS OF CENTRIFUGAL PUMPS." ETM - Equipment, Technologies, Materials 14, no. 02 (2023): 77–83. http://dx.doi.org/10.36962/etm14022023-77.
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A hydraulic device that is used to suck up liquid, move it under pressure or pump it, is called a pump. As a rule, any movement of a liquid by similar aggregates is carried out due to the transfer of potential or kinetic energy to it. Depending on the technical indicators, different types of pumps are used. At the same time, they differ in efficiency, power, volumes of fluid pumped per unit time, maximum head and resulting pressure. The most used group of pumps are vane pumps. Their distinctive feature is the impeller rotating in a fixed housing, equipped with blades. Depending on the warehouse of the impeller and the conditions for moving fluid through it, vane pumps are divided into centrifugal and vortex. With a centrifugal pump, liquid is supplied due to the centrifugal force that appears when the impeller rotates. She is carried away by the blades and, under the action of centrifugal force, moves from the middle of the wheel to the edges along the blades. The blades of the impellers are bent in the direction of rotation backwards. The number of blades is usually from 6 to 8 pieces. But special pumps for impure liquids, in order to increase the cross section of the channels in the wheel, are installed with a smaller number of blades from 2 to 4 pieces. Centrifugal pumps are usually installed above the liquid level in the receiving tank, so they must be filled before use. The pump is filled with a check valve on the suction line through the filling funnel until the gas is completely expelled from the suction pipeline and the pump housing. In the absence of a check valve, for filling, air is forced out of the pump housing with the valve closed by a special vacuum pump. The same is done when filling large pumps. Centrifugal pumps are characterized by a rather high efficiency, compactness and durability of use. Based on the numerical modeling of hydrodynamic processes, a substantiation of adjustment of the design of the working wheels of centrifugal pumps is given. Mathematical modeling of the fluid flow in the running part of the centrifugal pump is performed. The results of the CFD calculation are analyzed, after which an experimental work wheel is created, and its tests are carried out. There is a process of comparing a serial and experimental pump. Keywords: Centrifugal pumps, numerical modeling, mathematical model, energy characteristics, hydrodynamic processes, dynamic characteristics, power engineering, working wheel, working fluid, working wheel vanes.
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Dong, Wei, Diyi Chen, Jian Sun, Yan Dong, Zhenbiao Yang, and Junle Yan. "Influence of Balance Hole Diameter on Leakage Flow of the Balance Chamber in a Centrifugal Pump." Shock and Vibration 2021 (February 5, 2021): 1–11. http://dx.doi.org/10.1155/2021/8860493.
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The balancing holes in centrifugal pumps with seals mounted in both suction and discharge sides are one of the approaches used by pump manufacturers to reduce the axial thrust. The balance hole diameter directly affects the axial force of the centrifugal pump. The flow characteristics in the balance chamber are closely related to the balance hole diameter. However, research is not very clear on the internal flow of the balanced chamber, due to the small axial and radial sizes and the complicated flow conditions in the chamber. In this paper, we analyzed the influence of the balance hole diameter on the liquid leakage rate, flow velocity, and vortex motion in the balance chamber. The results indicated that when the balance hole diameter was lower than the design value, the volume flow rate of leakage flow was proportional to the diameter. The liquid flow rate and vortex distribution rules in the balance chamber were mainly associated with the coeffect of radial leakage flow in the rear sealing ring interval and the axial balance hole leakage flow. The research has revealed the mechanisms of leakage flow of the balance chamber in the centrifugal pump and that this is of great significance for accurate calculation and balancing of the axial force.
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Cui, Baoling, Chenliang Zhang, Yuliang Zhang, and Zuchao Zhu. "Influence of Cutting Angle of Blade Trailing Edge on Unsteady Flow in a Centrifugal Pump Under Off-Design Conditions." Applied Sciences 10, no. 2 (2020): 580. http://dx.doi.org/10.3390/app10020580.
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The parameters of blade trailing edge have an important influence on the performance of centrifugal pump and internal unstable flow. In this study, the influences of cutting angles of blade trailing edge on unstable pressure pulsation and unstable flow structure are investigated using a centrifugal pump under off-design conditions through large eddy simulation. Three typical blade trailing edges, namely, original trailing edge (OTE), 15° cutting angle of blade trailing edge (OBS15) and 30° cutting angle of blade trailing edge (OBS30), are analysed. Results show that the cutting angle of blade trailing edge has a certain effect on the performance of the centrifugal pump. Under part-load conditions, the OBS30 impeller evidently contributes to the reduction in pressure pulsation intensity. By contrast, the OBS15 impeller has opposite effect because of the increase in wake vortex intensity. The OBS30 impeller can effectively improve the unstable vortex structure caused by backflow at the centrifugal pump tongue using a new Ω method. Consequently, reduction in the unstable flow structure mainly contributes to the reduction in pressure pulsation used by the proper cutting angle of blade trailing edge.
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Si, Qiaorui, Gérard Bois, Minquan Liao, Haoyang Zhang, Qianglei Cui, and Shouqi Yuan. "A Comparative Study on Centrifugal Pump Designs and Two-Phase Flow Characteristic under Inlet Gas Entrainment Conditions." Energies 13, no. 1 (2019): 65. http://dx.doi.org/10.3390/en13010065.
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Capability for handling entrained gas is an important design consideration for centrifugal pumps used in petroleum, chemistry, nuclear applications. An experimental evaluation on their two phase performance is presented for two centrifugal pumps working under air-water mixture fluid conditions. The geometries of the two pumps are designed for the same flow rate and shut off head coefficient with the same impeller rotational speed. Overal pump performance and unsteady pressure pulsation information are obtained at different rotational speeds combined with various inlet air void fractions (α0) up to pump stop condition. As seen from the test results, pump 2 is able to deliver up to 10% two-phase mixtures before pump shut-off, whereas pump 1 is limited to 8%. In order to understand the physics of this flow phenomenon, a full three-dimensional unsteady Reynolds Average Navier-Stokes (3D-URANS) calculation using the Euler–Euler inhomogeneous method are carried out to study the two phase flow characteristics of the model pump after corresponding experimental verification. The internal flow characteristics inside the impeller and volute are physically described using the obtained air distribution, velocity streamline, vortex pattern and pressure pulsation results under different flow rates and inlet void fractions. Pump performances would deteriorate during pumping two-phase mixture fluid compared with single flow conditions due to the phase separating effect. Some physical explanation about performance improvements on handing maximum acceptable inlet two phase void fractions capability of centrifugal pumps are given.
Dissertations / Theses on the topic "Centrifugal-vortex pump"
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MIORINI, Rinaldo Luigi. "Investigations on the flow inside pumps by means of 2D particle image velocimetry." Doctoral thesis, Università degli studi di Bergamo, 2010. http://hdl.handle.net/10446/615.
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This work is concerned with the sampling, evaluating and critically interpreting of fuid dynamics phenomena inside two radically different pumps. Large scale flow structures are investigated in the vaned diffuser of a centrifugal pump and in the rotor passage of a water jet axial pump by means of two-dimensional particle image velocimetry (2DPIV).
In the first part of the work, a centrifugal pump is run at various capacities to derive information about the flow around the diffuser vanes. Preliminarily, time resolved pressure measurements have indicated the presence of very large scale non-periodic flow instability at very low flow-rates. Phase-averaged PIV measurements are performed at midspan over the blade to blade plane in the diffuser to describe both the channel flow and the wakes, which indeed dominate the flow in the diffuser. The flow is separated at the convex side of the diffuser vanes at reduced capacities, i.e. below the best effciency point
(BEP). Wakes shed from the impeller are convected in the di user passages and distorted because of the different transport velocity at the convex and concave sides of the vane. The measurements have been performed at Laboratorio di Fluidodinamica delle Macchine (LFM) at Politecnico di Milano, Milan, Italy.
In the second part, the tip leakage flow (TLF), tip leakage vortex (TLV) and the vorticity shed by the blade tip are investigated in the meridional plane of an axial pump to shed light over the inner structure of the vortices that develop in the passage, as well as the production of vorticity at the casing end-wall, induced by the presence of the TLV. Turbulence inside the TLV is also investigated. The rolling up of the TLV induces the detachment of the end-wall boundary layer vorticity, the detached flow rearranges in vortices - counter rotating respect with the TLV - that orbit around the TLV centerline and are interlaced with the TLV vorticity until its bursting. The detachment of the end-wall vorticity is unsteady and high level of in plane production of turbulent kinetic energy is found there. The vorticity layer that connects the blade and the TLV is also unsteady and source of large scale unsteadiness; the core of the TLV is unsteady but in plane production of turbulence is almost absent there. The experiments have been
performed at the Department of Mechanical Engineering, The Johns Hopkins University (JHU), Baltimore, MD, USA.
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Салтанова, Л. М., та Є. О. Пархоменко. "Удосконалення конструкції самовсмоктувального відцентрово-вихрового насоса для перекачування легколетких рідин". Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/40395.
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Насосне обладнання широко застосовується у всіх галузях народного
господарства. В умовах експлуатації насоси використовуються для
перекачування рідин, рідин з включеннями, а також газорідинних сумішей.
Особливе значення приділяється насосам для перекачування газорідинних
сумішей з можливістю видалення повітря із всмоктувального трубопроводу
самостійно без будь-яких додаткових зовнішніх пристроїв. Такі насоси
називаються самовсмоктувальними.
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Ткачук, Юрій Якович, Юрий Яковлевич Ткачук, Yurii Yakovych Tkachuk, Максим Васильович Найда, Максим Васильевич Найда, and Maksym Vasylovych Naida. "Graphic-analytical method of defining pressure characteristics of centrifugal-vortex pumps." Thesis, Sumy State University, 2014. http://essuir.sumdu.edu.ua/handle/123456789/40478.
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Centrifugal-vortex pumps are usually adopted for a small boiler feeding of a
hot-water heating system and also in the water-supply system, in the food and oil
industry.
Centrifugal-vortex pumps have rather good operating showings in the
results of successful using of the positive qualities if the centrifugal working wheel
and vortex one. They are fixed on the common shaft.
Book chapters on the topic "Centrifugal-vortex pump"
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Kamemoto, K., H. Kurasawa, H. Matsumoto, and Y. Yokoi. "Analysis of Unsteady Characteristics of Flows Through a Centrifugal-Pump Impeller by an Advanced Vortex Method." In Hydraulic Machinery and Cavitation. Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-010-9385-9_74.
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Li, Chenhao, Chi Gao, Xitong Wu, Xingqi Luo, Guojun Zhu, and Like Wang. "Numerical Investigation of Internal Energy Characteristics and Flow Field of Double Suction Pump." In Advances in Transdisciplinary Engineering. IOS Press, 2023. http://dx.doi.org/10.3233/atde230864.
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In order to research the flow characteristics within the double-suction centrifugal pump, 650SY80-HY type pump is used to research, and the RNG k-ε turbulence model is selected to research and analyze the flow field within the double-suction pump under different working conditions. The results show that: the error between the results of the simulation and experimental is within an acceptable range, which verifies the precision of the numerical simulation; Under different conditions, the pressure distribution of the blade is uniform, and there is less pressure on the blade head; Under the 0.8Qd condition, due to the impact of water flow on the initial end of the partition, there is a large area of low velocity zone outside the partition, resulting in a large energy loss; The turbulent kinetic energy (TKE) mainly exists in the outside of the partition under the 0.8Qd condition, while the TKE mainly exists in the tongue under the 1.2Qd condition. Under the design condition, the vortex in the impeller channel is obviously less than that under the off-design condition. This study provides a basis for further optimization of the design of double suction pump.
Conference papers on the topic "Centrifugal-vortex pump"
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Timushev, Sergey. "Development and Experimental Validation of 3D Acoustic-Vortex Numerical Procedure for Centrifugal Pump Noise Prediction." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78400.
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Numerical procedure of 3D flow induced noise modeling in centrifugal pumps is developed by linking the acoustic-vortex computational method of pseudo-sound and noise prediction that earlier was implemented in two dimensional prediction of pressure pulsations and noise and CFD code FlowVision. The 3D CFD–CAA acoustic-vortex method is validated by experiments on axial and centrifugal ventilators. Measurements of pressure pulsations and noise are completed for a wide range of rotation speeds. Further computational tests are made for a centrifugal boiler feed pump stage with and without vane diffuser.
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Wu, Yulin, Naixiang Chen, Zhaohui Xu, and Shuhong Liu. "Unsteady Flow Simulation Through a Centrifugal Pump." In ASME 2005 Fluids Engineering Division Summer Meeting. ASMEDC, 2005. http://dx.doi.org/10.1115/fedsm2005-77012.
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Flow in a typical centrifugal pump is known to be unsteady due to flow instabilities and mutual interactions between the rotating part and the stationary parts. Flow instabilities are mostly viscous phenomena such as boundary layer separation and vortex shedding that produces relatively low frequency and small amplitude pressure fluctuations. Mutual interaction between the impeller blades and the guide vane diffuser produces relatively high frequency and large amplitude pressure fluctuations. This phenomenon is more closely related to compressibility than viscosity. It is important because it may cause structural vibration and noise. In this paper, the steady and unsteady turbulent flow through the whole flow passage of an entire centrifugal pump, has been computed to predict the pressure fluctuation of flow in the pump.
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Zhao, J. L., H. J. Wang, X. Y. Li, R. Z. Gong, and T. Xuan. "Vortex structure research method based on Q-criterion in a high-speed centrifugal pump." In 2014 ISFMFE - 6th International Symposium on Fluid Machinery and Fluid Engineering. Institution of Engineering and Technology, 2014. http://dx.doi.org/10.1049/cp.2014.1160.
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Lomakin, Vladimir, Vyacheslav Cheremushkin, and Pavel Chaburko. "Investigation of vortex and hysteresis effects in the inlet device of a centrifugal pump." In 2018 Global Fluid Power Society PhD Symposium (GFPS). IEEE, 2018. http://dx.doi.org/10.1109/gfps.2018.8472374.
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Gao, Bo, Ning Zhang, Zhong Li, and Minguan Yang. "The Unsteady Flow in a Centrifugal Pump With Special Slope Volute." In ASME 2013 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fedsm2013-16292.
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Conventional single stage centrifugal pumps are mostly designed with a spiral volute. Due to relative movement between impeller and the asymmetric volute the flow at the outlet of the impeller is strongly interacting with the volute flow. The unsteady phenomenon leads to unbalanced radial dynamic forces as well, especially at off-design points, giving rise to pump vibration and hydraulic noises. In order to weaken the unsteady phenomenon, a special kind of slope volute is designed. Different from the spiral one, it keeps the radial size of the volute casing unchanged, but increasing the axial size to make sure the sectional area changing regularly from the tongue to pump outlet. CFD analysis has used to solve the unsteady 3D viscous flow in both conventional and special designed centrifugal pumps with the same impeller for several flow rates. Compared to the spiral volute pump, there’s secondary flow with only one vortex existing in the slope volute. The average pressure and amplitudes of pressure fluctuations keep nearly unchanged along the slope volute wall due to the symmetrical shape in the radial direction. The pressure distributions for both pumps at fBPF are also very different. Interaction of the impeller flow with the tongue is weaken due to the different kind of tongue shape. It has little influence on the interaction flow field in the pump with slope volute. The radial load component always reaches a minimun magnitude at nominal conditions for both pumps. But the traces calculated for the pump with slope vloute are less stretched in the radial direction than those computed for the pump with spiral volute. Results indicate that a lower pulsation of the radial force is expected, and hardly affected by the flow rate for the pump with slope volute.
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Baum, Andreas, and Martin Böhle. "Numerical Investigation of the Performance Curve Instability of a Centrifugal Pump With Vaned Diffusers." In ASME 2024 Fluids Engineering Division Summer Meeting collocated with the ASME 2024 Heat Transfer Summer Conference and the ASME 2024 18th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/fedsm2024-131065.
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Abstract Centrifugal pumps equipped with vaned diffusers of specific speed nq ≥ 30 ([min−1, m3 s−1, m]) are prone to performance curve instability at part-load. The present paper deals with the numerical comparison between a middle stage of a multi stage centrifugal pump equiped with a vaned diffuser (nq ≈ 35 ([min−1, m3 s−1, m]) and a vaneless diffuser respectively. For the simulations the SAS-SST turbulence model has been used. While in the vaneless case a distinct head drop does not exist, a local dent appears for the vaned diffuser at approximately 60% of the design flow rate. With the onset of the instability, pressure generation shows extensive fluctuations between different revolutions. Besides classic performance evaluation, static pressure generation is analysed at the diffuser to characterize responsible sections for the head drop. Furthermore, the progression of the axial force shows distinct differences among both configurations. The results show, that highly transient flow detachment and vortex structures in the inlet triangle section at the diffuser vane suction side and the hub occur. These vortex structures lead to increased losses in the inlet trianglular section and induce recirculation zones at the impeller outlet. Thus, inferences can be drawn between pattern switching phenomenon and axial force of the pump.
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Zhang, Ning, Minguan Yang, Bo Gao, Zhong Li, and Dan Ni. "Investigation on Rotor-Stator Interaction in a Low Specific Speed Centrifugal Pump." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-33495.
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In centrifugal pump, due to intense rotor-stator interaction, high amplitude pressure pulsating would be induced, and it has a crucial influence on the stable operating of the pump. In this paper, a low specific speed centrifugal pump is investigated to illustrate unsteady flow within the centrifugal pump. Pressure pulsation signals are attained by mounting 20 monitoring points along the spiral volute, covering all the interested region of the model pump. FFT (Fast Fourier Transform algorithm) is applied to analyze the time-domain pressure signals. Results show that in pressure spectra, evident peaks at blade passing frequency fBPF together with its high harmonics can be identified, and the amplitudes are closely associated with operating conditions of the model pump and the positions of the monitoring points. At nominal flow rate, four vortical regions with high amplitude are captured inside the model pump. And the unsteady vortical structure at the near tongue region is related to the relative position of the impeller with respect to the tongue, and the upstream effect of the volute tongue significantly affects the vorticity distribution on the blade pressure side. At off-design conditions, the interaction pattern between the vortical structure and the volute tongue is significantly affected compared with that at the rated condition, as to the upstream effect of the tongue. At high flow rate, partial vortex would separate from the main vortex, but at low flow rate, the cutting and impingement effects of the tongue are much weaker due to almost all the vortex moving to the narrow side of the tongue. Based on the analysis of rotor-stator interaction in the model pump, some conclusions could be obtained. Pressure amplitudes at fBPF are associated with the positions of monitoring points and operating conditions of the model pump. Vorticity magnitude at blade exit increases as the impeller passes the volute tongue. And the fluid-dynamic blade-volute interaction is dominated by the vorticity shedding from blade trailing edge and their impingement on the volute tongue with subsequent cutting and distortion. And high pressure amplitude is generated with the corresponding high vorticity magnitude observed. So the intense interaction between flow structures (jet-wake pattern) and volute tongue is crucial to unsteady pressure pulsation. Thus, to lower pressure pulsation amplitude and fluid dynamic forces, controlling the vortical structure at blade trailing edge is an effective method.
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Kagawa, Shusaku, and Junichi Kurokawa. "New Centrifugal Pump in Very Low Specific Speed Range." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-06018.
Full textAbstract:
In the range of very low specific speed, such as ns < 80 [min.−1, m3/min., m], or Ns < 533 [min.−1, USGPM, ft.], stable head-capacity curve is one of the most important issues. The head-capacity curve of a conventional closed impeller tends to be unstable with a positive slope characteristic in such a very low ns range. To solve this problem, a new type of centrifugal pump “J-groove pump” is proposed and tested in this study. The J-groove pump is composed of a rotating disk mounted with many shallow radial grooves and a circular casing. The experimental results reveal that the proposed J-groove pump is quite effective in the very low specific speed range. The pump head is about 1.2 times higher than that of a conventional centrifugal pump and the head-capacity curve is almost stable, though the efficiency becomes a little lower because of a large friction power of the stationary wall. The cavitation performance is also measured and is shown to be almost same as that of a conventional centrifugal pump. This pump is applicable to high speed pump, as it has no small clearance, high strength due to simple impeller configuration, and easy to assemble. In order to determine the internal flow characteristics of the J-groove pump, CFD simulation is carried out. It is revealed that the high head of the J-groove pump is caused by a strong vortex flow existing in both clearances near the impeller tip over the whole flow range.
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Hou, Hucan, Yongxue Zhang, Zhenlin Li, Xin Zhou, and Zizhe Wang. "Hydraulic Design of Inlet Guide Vane and its Full Flow Passage Numerical Simulation on Centrifugal Pump." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36209.
Full textAbstract:
In order to effectively improve hydraulic performance of centrifugal pump on off-conditions, the hydraulic design of inlet guide vane (IGV) was completed by adopting two dimensional theory in-house code based on one kind of IS series of centrifugal pump, which can achieve pre-whirl regulation of centrifugal pump. During design process the trailing edge of vane is assumed as equal velocity moment condition, and the distribution of vane setting angle along meridional streamline is also given as a quartic function firstly, the camber line is then drawn by point-by-point integration method and thickened at both sides along circumferential direction. With local vortex dynamics diagnosis theory, the optimal improvement of vane space shape can be finished by adjusting the design parameters of vane setting angle distribution coefficient ap. The full flow passage numerical simulations of centrifugal pump with IGV device are completed to analyze the influence of pre-whirl regulation on hydraulic performance of centrifugal pump under various pre-whirl angles. The results show that the pre-whirl regulation can improve the hydraulic performance of centrifugal pump on off-conditions. Under the positive pre-whirl regulation conditions, the best efficient point shift to small flow rate zone, and under the negative pre-whirl regulation conditions it moves to large flow rate zone. Compared with the pump without IGV device at the same flow rate condition of 0.8Q (Q the design flow rate), the hydraulic efficiency of centrifugal pump with IGV device improves obviously and reaches up to 1.43%. Meanwhile compared with that installed with the straight vanes designed based on the traditional theory, the inner flow field of centrifugal pump with the designed vanes improves and the overall hydraulic efficiency of centrifugal pump is somewhat increased.
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Jiang, Chen-Xing, Xi Wang, Na-Xin Kang, Xiang-Yuan Zhang, Zhi-Jun Shuai, and Wan-You Li. "Numerical Study on Transient Dynamics in a Centrifugal Pump Considering Clearance Flow." In ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83525.
Full textAbstract:
This paper investigates the transient flow characteristics and the forces on the impeller in a single-stage centrifugal pump considering the clearance flow. The finite volume method is employed to simulate the dynamics process. First, Numerical simulation is carried out in a commercial code CFX. The external performance characteristics, internal flow structure and pressure fluctuation in the two different models, with clearance and without clearance, are compared. It is found that the existence of the clearance flow can generate more vortex and hydraulic loss, which makes the flow state more complicated. Besides, the transient radial and axial forces on the impeller are analyzed. And an optimized model with modified chamber flow field is proposed, which can provide a theoretical foundation on the structure design of the centrifugal pump.