Investigation on the mechanism between vortex and cavitation in an axial waterjet pump

被引：0
|
作者：
Xu S. [1 ]
Long X. [1 ]
Ji B. [1 ]
Li G. [2 ]
机构：
[1] State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan
[2] State Key Laboratory of Waterjet Propulsion Technology, Marine Design and Research Institute of China, Shanghai
来源：
Ji, Bin (jibin@whu.edu.cn) | 1600年 / Editorial Board of Journal of Harbin Engineering卷 / 41期
关键词：
Cavitation; Critical cavitation; Cylindrical coordinate system; Hydraulic performance; Numerical simulation; Vorticity transport; Waterjet pump;
D O I：
10.11990/jheu.201907002
中图分类号：
学科分类号：
摘要：
Cavitation in a waterjet pump directly affects the propulsion efficiency, especially in the case of a hydraulic performance breakdown. At present, due to the fact that the interaction between vortex and cavitation in waterjet pumps is not fully understood under such working conditions, an in-depth research on this specific mechanism must be carried out. In this study, the detached eddy simulation (DES) turbulence model and the Zwart-Gerber-Belamri (ZGB) cavitation model were used in order to simulate the cavitating flow in the waterjet pump under the critical working conditions, when the performance drops sharply. The vorticity transport equation with a cylindrical coordinate system is employed in order to study the vortex-cavitation interaction in waterjet pumps. The results show that the cavitation performance curve of the numerical calculation agrees quite well with the available experimental results. The Vortex stretching term is closely related with the distribution of vorticity. The vortex dilation term and the baroclinic torque term appear mainly at the vapor liquid interface, which causes the redistribution of vorticity. The magnitude of the vortex dilation term is larger than that of the baroclinic torque term. In the blade tip region, the magnitude of the viscous dissipation term is larger and the effect of this term cannot be neglected. © 2020, Editorial Department of Journal of HEU. All right reserved.
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页码：951 / 957
页数：6
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