Comparative research on various turbulence closure models for unsteady cavitation flows in the ultra-low specific speed centrifugal pump

Wang, C; Zhang, Y X; Zhang, J Y; Li, Z W; Xu, Ao

doi:10.1088/1755-1315/240/6/062038

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…[6][7][8] Many scholars have done a lot of numerical research on the external characteristics and internal flow of blood pumps. 9 In order to reveal the interaction between the centrifugal blood pump and blood during the operation, Feng et al 10 adopted the standard k-v turbulence model to simulate the flow in the pump and analyzed the influence of the changes in blade height, rotating speed, and other factors on the flow field and dynamic performance of the pump. The results show that the rotating speed of the impeller has the greatest influence on the performance.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the flow field characteristics of a centrifugal blood pump in a heartbeat cycle

Zhang,

Yang,

Shao

2024

Advances in Mechanical Engineering

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Blood pumps are medical devices that can temporarily or permanently replace the heart to perform the job of blood pumping. To study the internal flow field characteristics of the centrifugal blood pump, high-speed photography (HSP) images of the internal flow in the centrifugal blood pump were taken, and the internal flow field was numerically simulated. According to the heartbeat rule, the visualization experiment method and numerical simulation method for the internal flow of the centrifugal blood pump were developed. The internal flow rule of the centrifugal blood pump during a heartbeat cycle was revealed, as well as the influence of pump construction, flow rate, and other factors on the pump’s flow field. The results indicate that the flow rate and the rotor/stator interference of the blade and volute tongue cause two periodic changes in the pump pressure and velocity. One is the cycle of the heartbeat, and the other is the cycle of the blade’s rotation. The research results are of great significance in reducing the mechanical damage of blood, optimizing the structure of the pump and improving the stability of the centrifugal blood pump.

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Section: Introductionmentioning

confidence: 99%

Analysis of the flow field characteristics of a centrifugal blood pump in a heartbeat cycle

Zhang,

Yang,

Shao

2024

Advances in Mechanical Engineering

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“…Inlet recirculation has various consequences, including cavitation [11] and rotating stall [12], which can occur regardless of favorable standard cavitation characteristics. Input recirculation analysis in most cases requires the selection of a suitable turbulent model for nonstationary calculations, which is presented in [13].…”

Section: Introductionmentioning

confidence: 99%

Challenges in the Numerical Analysis of Centrifugal Pumps¨: Energetic, Cavitation and Dynamic Characteristics

Lipej¹

2022

Eng. Technol. Appl. Sci. Res.

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Pumps are energetic devices that are present in a wide range of industries. Their installed power varies from a few tens of watts up to hundreds of megawatts. As the energy consumption is connected with global warming and climate change, the development of pumps that have good characteristics is very important. Theoretical and experimental methods have long been utilized in the development of pumps, but recently much research has been carried out with the help of Computational Fluid Dynamics (CFD) analysis. Certain numerical analyses can be of high quality and accurate, but special operational phenomena still occur, where special attention is required when performing analysis. This category includes operating regimes outside the Best Efficiency Point (BEP), the formation of inlet recirculation, cavitation, and the influence of wall roughness on all the above characteristics. The current paper presents the main problems that developers face when numerically analyzing the above-mentioned special operating regimes. Both numerical and experimental results are considered.

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Effects of Coolant and Working Temperature on the Cavitation in an Aeronautic Cooling Pump with High Rotation Speed

Zhao

Wang³

et al. 2022

Machines

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The centrifugal pump with high rotation speed is the key component in the cooling system of an aircraft. Because of the high rotation speed, the impeller inlet is very prone to cavitation. Two impellers with different types of blades (cylindrical and splitter) are designed, and the numerical models of the pumps are built. The authenticity of the numerical models is validated with the corresponding experiments in terms of both the hydraulic and cavitation characteristics. Then, the effects of different coolants and working temperatures on the hydraulic and cavitation performances of the prototype models are studied based on the numerical simulations. The results show that the head and efficiency of the pump for conveying water are higher than those for conveying ethylene glycol (EG) aqueous solution and propylene glycol (PG) aqueous solution (EGaq and PGaq are defined to represent the EG aqueous solution and the PG aqueous solution, respectively). The hydraulic performance in the EGaq is slightly better than that in the PGaq. The cavitation performance of water is far less than that of the EGaq and PGaq under high working temperature. The volume of cavitation in EGaq is smaller than that in PGaq, and the volume of cavitation in the splitter blades is slightly smaller than that in the cylindrical blades. It is suggested that EGaq be used as the first option. The splitter blades can improve the cavitation performance somehow while the improvement by using the splitter blades is very limited at high rotation speeds, and the design of the short blades should be careful in order to obtain a smooth internal flow field.

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Comparative research on various turbulence closure models for unsteady cavitation flows in the ultra-low specific speed centrifugal pump

Cited by 3 publications

References 11 publications

Analysis of the flow field characteristics of a centrifugal blood pump in a heartbeat cycle

Analysis of the flow field characteristics of a centrifugal blood pump in a heartbeat cycle

Challenges in the Numerical Analysis of Centrifugal Pumps¨: Energetic, Cavitation and Dynamic Characteristics

Effects of Coolant and Working Temperature on the Cavitation in an Aeronautic Cooling Pump with High Rotation Speed

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