Optimization of a Screw Centrifugal Blood Pump Based on Random Forest and Multi-Objective Gray Wolf Optimization Algorithm DOI Creative Commons
Jing Teng, Haoran Sun, Jianan Cheng

et al.

Micromachines, Journal Year: 2023, Volume and Issue: 14(2), P. 406 - 406

Published: Feb. 8, 2023

The centrifugal blood pump is a commonly used ventricular assist device. It can replace part of the heart function, pumping throughout body in order to maintain normal function. However, high shear stress caused by impeller rotating at speeds lead hemolysis and, as consequence, stroke and other syndromes. Therefore, reducing level while ensuring adequate pressure generation key optimization pumps. In this study, screw was research object. addition, were optimized simultaneously using coupled algorithm composed random forest (RF) multi-objective gray wolf (MOGWO). After verifying prediction accuracy algorithm, three models selected compared with baseline model terms cloud, 2D streamline, SSS distribution, HI vortex distribution. Finally, via comprehensive evaluation, final design, which increased 24% value decreased 48%.

Language: Английский

Towards the pumped-hydro energy storage: improvement on the flow instability and cavitation performance with application-oriented forward skew angle of impeller blades DOI
Weixiang Ye, Huan Liu, Hong Wang

et al.

Energy, Journal Year: 2025, Volume and Issue: unknown, P. 134565 - 134565

Published: Jan. 1, 2025

Language: Английский

Citations

3
Vortex and energy characteristics in the hump region of pump-turbines based on the rigid vorticity and local hydraulic loss method DOI
Lianchen Xu, Yuquan Zhang, Junhui Xu

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(3)

Published: March 1, 2025

With the climate change hazards and implementation of pumped-storage hydropower units in power grid increases, maintaining hydraulic stability hump region is primordial for energy transition yet presents a significant challenge. This study investigates loss characteristics instability pump-turbine during operation using both model testing computational fluid dynamics methods. The results indicate that predominantly occurs guide vane (GV) passage draft tube (DT), more with flow reduction. Specifically, vaneless space linked to shear vorticity, while rigid vorticity plays prominent role GV DT. Analysis Rortex enstrophy transport equation shows pseudo-Lamb term dominant factor influencing vortex evolution. Additionally, combining Reynolds-averaged Navier–Stokes equations particle image velocimetry experiments reveals near zero-velocity gradient region, effects are concentrated core on runner side, primarily wake direction motion.

Language: Английский

Citations

1
Investigation on the unstable flow characteristic and its alleviation methods by modifying the impeller blade tailing edge in a centrifugal pump DOI
Weixiang Ye,

Baotang Zhuang,

Yuliang Wei

et al.

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 86, P. 111358 - 111358

Published: March 26, 2024

Language: Английский

Citations

8
Enhancing operational stability of a reversible pump-turbine through blade lean design DOI Creative Commons
Giacomo Zanetti, Giovanna Cavazzini, Alberto Santolin

et al.

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 92, P. 112218 - 112218

Published: May 30, 2024

To provide the flexibility required by evolving electrical grid, reversible pump-turbines (RPT) nowadays are to rapidly switch operating mode and operate at deep partial loads currently affected strong fluid-dynamic instabilities. Despite these urgent needs, design strategy of RPTs is still lacking an effective way mitigate unstable behaviour in zones, which avoided for negative influence on machine operability longevity. This paper aimed defining guidelines facing this challenge it presents in-depth investigation blades lean angle RPT behaviour. Considering performances, pressure force pulsations, five runners with different blade leaning distribution (high negative, positive, curved positive) were numerically analysed compared original geometry (no lean) during transition from a load zero-discharge condition. As results, close relation between hydrodynamic instability runner demonstrate. All configurations showed development rotating stall certain point but highlighted intensities phenomenon onset points. In particular, among geometries, positive proved be particularly resilient perturbations associated full stall, significantly improving region characteristic curve.

Language: Английский

Citations

7
Research on wake and potential flow effects of rotor–stator interaction in a centrifugal pump with guided vanes DOI Open Access
Tao Yu, Zhi-Jun Shuai, Xi Wang

et al.

Physics of Fluids, Journal Year: 2023, Volume and Issue: 35(3)

Published: Feb. 13, 2023

In this paper, the wake and potential flow effects of rotor–stator interaction in a centrifugal pump with guide vanes are investigated from view separation turbulent acoustic pressure fluctuations. The highest vibration levels pumps are, general, originated effects. However, it is challenging to distinguish their on evolution. pellicular mode decomposition method applied innovatively separate disturbances pump. By pellicular, we mean an infinitely thin layer air located monitoring surface. modes set modes, which normalized orthogonal basis can be constructed. impacts visualized evaluated quantitatively. results show that only very limited region where disturbance works. higher harmonics, smaller range. responsible for modal field. Modal fields low diametrical nodes decay more slowly than those harmonics. addition, special attention paid impact geometric asymmetry volute impeller force. circular two-stage drop improves radial force impeller. More deep understandings mechanism reached by decoupling disturbances. This work serves as further research fault diagnosis control pumps.

Language: Английский

Citations

14
Research on pressure pulsation characteristics of a pump-turbine in pump mode with rotating stall: Focus on the broadband frequency DOI Creative Commons
Yongshun Zeng, Zhaohui Qian, Weixiang Ye

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(4)

Published: April 1, 2024

To investigate the adverse effects of rotating stalls on pressure pulsation characteristics a pump-turbine in pump mode, an unsteady numerical simulation was carried out by applying partially averaged Navier–Stokes turbulence model. The methods were carefully verified, and onset flow rate hump at performance curve heads good agreement with experimental data. stall appeared guide vane when ranged from 0.514 to 0.887 times best efficiency point (QBEP), frequency 11.7% rotational frequency. In period stall, sudden intensive channel observed named as component broadband frequency, its corresponding mechanism explained vortex evolution between adjacent blades based dynamic mode decomposition technology. There three distinct frequency: (i) intermittent occurrence cell propagated current channel, (ii) wide range varying rate, (iii) considerable amplitude, e.g., reaching 21.1%–42.2% that addition, both amplitude gradually decreased increased 0.887QBEP. This study clarified internal behaviors if occurred, which important assess stability units.

Language: Английский

Citations

5
Investigation of internal flow characteristics by a Thoma number in the turbine mode of a Pump–Turbine model under high flow rate DOI
Seung-Jun Kim,

Hyeon-Mo Yang,

Jungwan Park

et al.

Renewable Energy, Journal Year: 2022, Volume and Issue: 199, P. 445 - 461

Published: Sept. 9, 2022

Language: Английский

Citations

20
Blade redesign based on secondary flow suppression to improve the dynamic performance of a centrifugal pump DOI

Chengshuo Wu,

Kexin Pu,

Peili Shi

et al.

Journal of Sound and Vibration, Journal Year: 2023, Volume and Issue: 554, P. 117689 - 117689

Published: March 30, 2023

Language: Английский

Citations

13
Evolution mechanism of unsteady internal flow of an ultra-high head pump-turbine in pump mode DOI

Jinhong Hu,

Xianwu Luo, Yongzhi Zhao

et al.

Journal of Energy Storage, Journal Year: 2023, Volume and Issue: 74, P. 109309 - 109309

Published: Oct. 18, 2023

Language: Английский

Citations

12
Effect of single blade trailing edge side fracture on flow characteristics of centrifugal pump DOI
Huairui Li, Rongyong Zhang, Huazheng Chen

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(10)

Published: Oct. 1, 2024

Centrifugal pumps are essential components in various industrial applications, where their stable and efficient operation is critical. The impeller, a key part of these pumps, plays pivotal role energy conversion; thus, any fracture its blades can significantly impact the pump's performance. This study investigates effects single-blade trailing edge on flow characteristics centrifugal pump, aiming to provide insights into fault diagnosis performance optimization. By employing combination experimental analysis numerical simulation, analyzes changes pump performance, pressure distribution, vortex structures, entropy production, blade loading, transient radial force, pulsation. results indicate that minor fractures have minimal head efficiency, while severe cause noticeable decrease across all rates, with efficiency remaining relatively at low-flow rates. Transient analyses reveal alter distribution magnitude forces, leading pulsation characteristics, shaft passing frequency amplitude increasing gradually surpassing amplitude. These findings important references for diagnosing fluid-induced failures, effectively enabling extraction hydraulic features optimize process.

Language: Английский

Citations

4