Numerical simulation for the tip leakage vortex cavitation

被引:60
|
作者
Guo, Qiang [1 ,2 ]
Zhou, Lingjiu [1 ,3 ]
Wang, Zhengwei [4 ]
Liu, Meng [1 ]
Cheng, Huan [1 ]
机构
[1] China Agr Univ, Coll Water Resources & Civil Engn, Beijing, Peoples R China
[2] Yangzhou Univ, Sch Hydraul Energy & Power Engn, Yangzhou, Jiangsu, Peoples R China
[3] Beijing Engn Res Ctr, Safety & Energy Saving Technol Water Supply Netwo, Beijing, Peoples R China
[4] Tsinghua Univ, Dept Energy & Power Engn, Beijing, Peoples R China
基金
中国国家自然科学基金;
关键词
Tip leakage vortex; Cavitation; Eddy-viscosity model; Rotation-curvature correction; TURBULENCE MODELS; FLOW; CLEARANCE; IDENTIFICATION; VORTICES; FIELD;
D O I
10.1016/j.oceaneng.2017.12.057
中图分类号
U6 [水路运输]; P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
The tip leakage vortex (TLV) cavitation is investigated by a commercial Reynolds averaged Navier-Stokes (BANS) solver. A referenced test on a NACA0009 hydrofoil is used to validate the numerical simulation. Considering the local rotation characteristics of the vortical flow, a rotation-curvature corrected Shear-Stress-Transport model (SST-CC model) is applied to simulate the time-averaged turbulent flow. Compared to the original SST model, the SST-CC model improves the prediction of the velocity in TLV on the measured sections in downstream, and the vorticity and pressure features along the TLV trajectory are analysed numerically. In order to increase the prediction accuracy for the TLV cavitation, the empirical condensation coefficient (F-c) in Zwart's cavitation model is calibrated based on the referenced experiment. By introducing a vortex identification parameter (f*) related to the strain rate tensor and the vorticity tensor, a relationship between the F-c and f* is built, and the effects of the rotational motion of the vortex on the cavity are embodied in a modified Zwart's cavitation model. Compared to the conventional Zwart's cavitation model, the modified cavitation model significantly improves the prediction of the TLV cavitation and gets a better agreement with the referenced test on different conditions with various gap widths.
引用
收藏
页码:71 / 81
页数:11
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