Design Improvement for Interventional Blood Pumps Based on Flow Analysis DOI Open Access
Zhenyang Cai, Jian Meng, Zhonghua Xu

et al.

Journal of Physics Conference Series, Journal Year: 2024, Volume and Issue: 2854(1), P. 012026 - 012026

Published: Oct. 1, 2024

Abstract Interventional blood pumps serve as a crucial component for temporary mechanical circulatory support in the treatment of heart failure, specifically designed to improve circulation recovery and survival rate patients undergoing acute cardiovascular diseases. This study aims design novel interventional pump with focus on achieving exceptional hydraulic performance superior compatibility based numerical simulation, which considers interactions between upstream (drainage cannula) downstream (aorta) flow fields, establishing full-scale field analysis. For method, Reynolds-Averaged Navier-Stokes (RANS) equations coupling k-ɛ turbulence model are solved. The result indicates that high shear stress exists around leading trailing edges impeller blades there is jet at outlet impeller, blade edge, dominant regions higher hemolysis occurrence. It also noted presence an generates significant vortex structures within aorta. To effectively reduce index, back-sweep concept applied this optimize impeller’s edge. analysis confirms back swept edge helps pumps.

Language: Английский

Improvement of energy performance of the axial-flow pump by groove flow control technology based on the entropy theory DOI
Tong Mu, Rui Zhang, Hui Xu

et al.

Energy, Journal Year: 2023, Volume and Issue: 274, P. 127380 - 127380

Published: March 31, 2023

Language: Английский

Citations

25

The vortex dynamics characteristics in a pump-turbine: A rigid vorticity analysis while varying guide vane openings in turbine mode DOI
Xiaotong Yan, Kan Kan, Yuan Zheng

et al.

Energy, Journal Year: 2023, Volume and Issue: 289, P. 130086 - 130086

Published: Dec. 20, 2023

Language: Английский

Citations

20

Research on the mechanism of the effect of vortex on the hydraulic loss of pump as turbine units based on entropy production theory DOI
Xijie Song, Zhengwei Wang, Yan Jin

et al.

Renewable Energy, Journal Year: 2024, Volume and Issue: unknown, P. 122048 - 122048

Published: Nov. 1, 2024

Language: Английский

Citations

4

Experimental and numerical analysis of hydraulic performance in an axial-flow pump under diverse inflow conditions DOI

Dongsheng Wang,

通俊 高木,

Jiangang Feng

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(1)

Published: Jan. 1, 2025

Axial-flow pumps have complex hydraulic performance under diverse conditions, especially low-flow which may occur rotational stall and brings serious system vibration. By combining experiments numerical simulation analysis, the fine features of local internal flow field in multi-flow rate conditions are accurately reflected, revealing mechanism changes axial-flow different at conditions. As decreased, backflow velocity near wall area inlet pipe circumferential swirl increased gradually, tip leakage vortex (TLV) pressure surface also gradually. Based on average axial V0 design rate, was −1.18 −3.53 deep condition. The maximum vorticity TLV, secondary 5 × 106 S−2, intensity largest. interaction between vortices mainstream intensifies formation development passage blocks pipe. Under influence comprehensive factors, entropy production channel impeller region reached condition, both were above 22 10−2 kg m2 s−3 K−1, more than twice that outside saddle zone. This study analyzed instability biased from multiple levels perspectives, providing a basis for improving future.

Language: Английский

Citations

0

Applications of different vortex identification methods in cavitation of a self-priming pump DOI Creative Commons

Hai‐Bing Jiang,

Shao‐Han Zheng,

Yuliang Zhang

et al.

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: March 3, 2025

To investigate the internal flow mechanisms during cavitation in self-priming pumps, this study employs numerical simulations based on RNG k-ε turbulence model coupled with Schnerr–Sauer model. The vapor–liquid two-phase characteristics at critical condition are analyzed under various rates and rotational speeds. Based vorticity method, Q criterion, λ2 Δ λci Ω predictions comparative analyses of vortex structures pumps have been conducted. Additionally, energy loss regions pump before after onset has using theory entropy production. results demonstrate that criterion yield consistent identification outcomes across different regions. In contrast, produce more fragmented vortices, most notably gas–liquid separation chamber area, whereas method is susceptible to disturbances from strong shear layers; Energy losses not directly related but show a significant correlation intensity; Changes rate greatest impact average production reflux hole region, particularly high conditions; difference impeller largest occurs; When coefficient constant, vapor volume fraction region exhibits positive both speed.

Language: Английский

Citations

0

Study on the dynamic characteristics of sand-laden suction vortex in the hydraulic machinery based on experimental test DOI
Xijie Song, Alexandre Presas, Zhengwei Wang

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(5)

Published: May 1, 2025

Sediment-laden surface vortices in pump sump represent a three-phase flow, comprising gas, liquid, and solid phases, surpassing the complexity of clear water vortices, which has also more serious effect on hydraulic machinery. In this paper, focusing sediment-laden free model experiment was employed to investigate their motion characteristics. The spatiotemporal evolution been captured through three-dimensional velocity testing, revealing particle aggregation dispersion patterns within vortex cores at various stages. Radial core accelerates inward movement particles, while axial enhances vertical transport. scale sandy is larger than that approximately 1.2 times size, rotational lower for with maximum velocities 1.04 0.5 m/s, respectively. suction speed 6.1 initial stage, sediment-carrying capacity 21 greater. Finally, mechanism characteristics transporting sand air are discussed, along detrimental effects sediment erosion research findings paper have significant theoretical engineering values.

Language: Английский

Citations

0

Evolution of vortex structure around a wall-mounted rough hemisphere DOI
Xiang Qiu, Haoxuan Liu, Jiahua Li

et al.

Journal of Hydrodynamics, Journal Year: 2023, Volume and Issue: 35(3), P. 467 - 481

Published: June 1, 2023

Language: Английский

Citations

4

Advances in Flow Control Methods for Pump-Stall Suppression: Passive and Active Approaches DOI Creative Commons

Hongbo Zhao,

Xinxin Zhou, Long Meng

et al.

Energies, Journal Year: 2024, Volume and Issue: 17(23), P. 6157 - 6157

Published: Dec. 6, 2024

This article provides a comprehensive review of key approaches to suppressing stall flow in pumps, offering insights enhance pump performance and reliability. It begins by outlining the formation mechanisms characteristics stalls, followed an in-depth analysis various types. The discussion highlights passive active control methods, emphasizing their roles phenomena. Passive flow-control strategies, including surface roughness, grooves, obstacles, fixed guide vanes, vortex generators, are examined with focus on effectiveness stall. Similarly, techniques, such as jets adjustable explored for capacity regulate field suppress novelty this lies its exploration methods stall, action underlying principles formation. findings reveal that appropriate measures can mitigate laminar separation reduce losses associated However, careful attention must be given optimal arrangement devices. Finally, limitations current implementations combined while into future potential advanced technologies regard

Language: Английский

Citations

1

A decomposition method of vortex identification and its application in side channel pumps DOI
Ke Chen, Fan Zhang, Yujian Fang

et al.

Journal of Hydrodynamics, Journal Year: 2022, Volume and Issue: 34(6), P. 1106 - 1120

Published: Dec. 1, 2022

Language: Английский

Citations

6

Evaluation of vortex evolution and energy loss within the impeller of a side channel pump DOI
Ke Chen, Fan Zhang, Yujian Fang

et al.

Journal of Hydrodynamics, Journal Year: 2023, Volume and Issue: 35(2), P. 240 - 251

Published: April 1, 2023

Language: Английский

Citations

3