Investigation of unsteady cavitation around hydrofoil based on PANS model

被引：0

作者：

机构：

[1] Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, Jiangsu

来源：

Shi, W. (wdshi@ujs.edu.cn) | 1600年 / Huazhong University of Science and Technology卷 / 42期

关键词：

Cavitating flow; Cavitation model; Hydrofoil; Reentrant jet; Turbulence model; Vortex pair;

D O I：

10.13245/j.hust.140401

中图分类号：

学科分类号：

摘要：

Cavitating turbulent flow around a 2D Clark-y hydrofoil was simulated using the Partially-Averaged Navier-Stokes (PANS) method. The effect of a maximum density ratio between the liquid and the vapor on cavitating simulation, and the influence of control parameter fk in PANS model on the cloud cavitation instability and the evolution of cavity shape and lift coefficient during cloud cavitation were investigated. The results show that the maximum density ratio influences mass transfer rate between the liquid and the vapor. The accuracy of numerical prediction can be greatly improved by increasing the maximum density ratio. With decreasing fk, the predicted cavitating flow by PANS model becomes unsteady due to resolving more of the turbulent scales. The evolution of the lift coefficient during the cloud cavitation is very complicated and dramatic, because that the shedding cloud cavity is very unsteady. The calculated time averaged lift coefficient is 0.708, which is about 7% lower than the experimentally measured value of 0.760. The vortex pair with the opposite rotation direction caused by interaction between the reentrant and main flow is the main trigger of cloud cavity.

引用

页码：1 / 5+10

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