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LES method of the tip clearance vortex cavitation in a propelling pump with special emphasis on the cavitation-vortex interaction
Journal of Hydrodynamics ( IF 2.5 ) Pub Date : 2020-11-23 , DOI: 10.1007/s42241-020-0070-9
Cheng-zao Han , Shun Xu , Huai-yu Cheng , Bin Ji , Zhi-yuan Zhang

The turbulent cavitating flow around the propelling pump tip clearance is numerically simulated using the large eddy simulation (LES) method coupled with the Zwart-Gerber-Belamri (ZGB) cavitation model to investigate the cavitation-vortex interaction mechanism. The calculated cavitation structures around the blades are in a remarkable agreement with the experimental results. The distributions of the tip clearance vortex under two cavitation conditions are obtained and compared. The results show that the cavitation development enhances the vorticity generation and the flow unsteadiness around the tip clearance of a propelling pump. Vortices are basically located around the cavitation areas, particularly in the tip clearance region, during the cavitation. The relative vorticity transport equation is applied for the cavitating turbulent flows and it is further indicated that the vortex stretching term makes the main contribution in the vortex production, and the baroclinic torque and dilation terms are important source terms for the vorticity generation in the cavitating flow. In addition, the viscous diffusion term and the Coriolis force term are significant in modifying the vorticity field inside the blade tip clearance.



中文翻译:

LES方法对推进泵中的尖端间隙涡流空化进行了研究,特别强调了空化-涡流相互作用

利用大涡模拟(LES)方法和Zwart-Gerber-Belamri(ZGB)空化模型,对推进泵尖端间隙周围的湍流空化流进行了数值模拟,以研究空化-涡旋相互作用的机理。计算得出的叶片周围的气穴结构与实验结果非常吻合。得到并比较了两种空化条件下叶尖间隙涡的分布。结果表明,气蚀现象的发展增强了推进泵尖端间隙周围的涡流产生和流动不稳定。在空化过程中,涡流基本上位于空化区域周围,特别是在尖端间隙区域中。将相对涡度输运方程应用于空化湍流,并进一步表明,涡旋拉伸项是产生涡流的主要因素,斜压转矩和膨胀项是空化流中产生涡度的重要来源项。 。另外,粘性扩散项和科里奥利力项在修改叶尖间隙内部的涡旋场方面很重要。

更新日期:2020-12-01
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