Numerical Analysis of the Effect of Cavitation on the Tip Leakage Vortex in an Axial-Flow Pump
To understand the effect of cavitation on the tip leakage vortex (TLV), turbulent cavitating flows were numerically investigated using the shear-stress transport (SST) k–ω turbulence model and the Zwart–Gerber–Belamri cavitation model. In this work, two computations were performed—one without cavita...
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doaj-972fdba6c1bc41f0947f7b1dceff43012021-07-23T13:48:55ZengMDPI AGJournal of Marine Science and Engineering2077-13122021-07-01977577510.3390/jmse9070775Numerical Analysis of the Effect of Cavitation on the Tip Leakage Vortex in an Axial-Flow PumpHu Zhang0Jun Wang1Desheng Zhang2Weidong Shi3Jianbo Zang4Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, ChinaSchool of Mechanical Technology, Wuxi Institute of Technology, Wuxi 214121, ChinaResearch Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, ChinaSchool of Mechanical Engineering, Nantong University, Nantong 226019, ChinaSchool of Mechanical Technology, Wuxi Institute of Technology, Wuxi 214121, ChinaTo understand the effect of cavitation on the tip leakage vortex (TLV), turbulent cavitating flows were numerically investigated using the shear-stress transport (SST) k–ω turbulence model and the Zwart–Gerber–Belamri cavitation model. In this work, two computations were performed—one without cavitation and the other with cavitation—by changing the inlet pressure of the pump. The results showed that cavitation had little effect on the pressure difference between the blade surfaces for a certain cavitation number. Instead, it changed the clearance flow and TLV vortex structure. Cavitation caused the TLV core trajectory to be farther from the suction surface and closer to the endwall upstream of the blade. Cavitation also changed the vortex strength distribution, making the vortex more dispersed. The vortex flow velocity and turbulent kinetic energy were lower, and the pressure pulsation was more intense in the cavitating case. The vorticity transport equation was used to further analyze the influence of cavitation on the evolution of vortices. Cavitation could change the vortex stretching term and delay the vortex bending term. In addition, the vortex dilation term was drastically changed at the vapor–liquid interface.https://www.mdpi.com/2077-1312/9/7/775tip leakage vortex (TLV)cavitationaxial-flow pumpvortex strengthvortex characteristic |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hu Zhang Jun Wang Desheng Zhang Weidong Shi Jianbo Zang |
spellingShingle |
Hu Zhang Jun Wang Desheng Zhang Weidong Shi Jianbo Zang Numerical Analysis of the Effect of Cavitation on the Tip Leakage Vortex in an Axial-Flow Pump Journal of Marine Science and Engineering tip leakage vortex (TLV) cavitation axial-flow pump vortex strength vortex characteristic |
author_facet |
Hu Zhang Jun Wang Desheng Zhang Weidong Shi Jianbo Zang |
author_sort |
Hu Zhang |
title |
Numerical Analysis of the Effect of Cavitation on the Tip Leakage Vortex in an Axial-Flow Pump |
title_short |
Numerical Analysis of the Effect of Cavitation on the Tip Leakage Vortex in an Axial-Flow Pump |
title_full |
Numerical Analysis of the Effect of Cavitation on the Tip Leakage Vortex in an Axial-Flow Pump |
title_fullStr |
Numerical Analysis of the Effect of Cavitation on the Tip Leakage Vortex in an Axial-Flow Pump |
title_full_unstemmed |
Numerical Analysis of the Effect of Cavitation on the Tip Leakage Vortex in an Axial-Flow Pump |
title_sort |
numerical analysis of the effect of cavitation on the tip leakage vortex in an axial-flow pump |
publisher |
MDPI AG |
series |
Journal of Marine Science and Engineering |
issn |
2077-1312 |
publishDate |
2021-07-01 |
description |
To understand the effect of cavitation on the tip leakage vortex (TLV), turbulent cavitating flows were numerically investigated using the shear-stress transport (SST) k–ω turbulence model and the Zwart–Gerber–Belamri cavitation model. In this work, two computations were performed—one without cavitation and the other with cavitation—by changing the inlet pressure of the pump. The results showed that cavitation had little effect on the pressure difference between the blade surfaces for a certain cavitation number. Instead, it changed the clearance flow and TLV vortex structure. Cavitation caused the TLV core trajectory to be farther from the suction surface and closer to the endwall upstream of the blade. Cavitation also changed the vortex strength distribution, making the vortex more dispersed. The vortex flow velocity and turbulent kinetic energy were lower, and the pressure pulsation was more intense in the cavitating case. The vorticity transport equation was used to further analyze the influence of cavitation on the evolution of vortices. Cavitation could change the vortex stretching term and delay the vortex bending term. In addition, the vortex dilation term was drastically changed at the vapor–liquid interface. |
topic |
tip leakage vortex (TLV) cavitation axial-flow pump vortex strength vortex characteristic |
url |
https://www.mdpi.com/2077-1312/9/7/775 |
work_keys_str_mv |
AT huzhang numericalanalysisoftheeffectofcavitationonthetipleakagevortexinanaxialflowpump AT junwang numericalanalysisoftheeffectofcavitationonthetipleakagevortexinanaxialflowpump AT deshengzhang numericalanalysisoftheeffectofcavitationonthetipleakagevortexinanaxialflowpump AT weidongshi numericalanalysisoftheeffectofcavitationonthetipleakagevortexinanaxialflowpump AT jianbozang numericalanalysisoftheeffectofcavitationonthetipleakagevortexinanaxialflowpump |
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