Numerical analysis of cavitation cloud shedding in a submerged water jet

查看全文 作　　者：Guoyi [1]PENG;[2]杨从新;Yasuyuki [1]OGUMA;Seiji [1]SHIMIZU

机构地区：[1]Department of Mechanical Engineering, College of Engineering, Nihon University;[2]School of Energy and Power Engineering, Lanzhou University of Technology

出　　处：《Journal of Hydrodynamics》索引2016年第28卷第6期,共8页

基　　金：supported by JSPS, Grantin-Aid for Scientific Research (C) (Grant No. 26420124) 摘　　要：Focused on the unsteady behavior of high-speed water jets with intensive cavitation a numerical analysis is performed by applying a practical compressible mixture flow bubble cavitation model with a simplified estimation of bubble radius. The mean flow of two-phase mixture is calculated by unsteady Reynolds averaged Navier-Stokes(URANS) for compressible flow and the intensity of cavitation in a local field is evaluated by the volume fraction of gas bubbles whose radius is estimated with a simplified RayleighPlesset equation according to pressure variation of the mean flow field. High-speed submerged water jet issuing from a sheathed sharp-edge orifice nozzle is treated. The periodically shedding of cavitation clouds is captured in a certain reliability compared to experiment data of visualization observation and the capability to capture the unsteadily shedding of cavitation clouds is demonstrated. The results demonstrate that cavitation takes place near the entrance of nozzle throat and cavitation cloud expands consequentially while flowing downstream. Developed bubble clouds break up near the nozzle exit and shed downstream periodically along the shear layer. Under the effect of cavitation bubbles the decay of core velocity is delayed compared to the case of no-cavitation jet. 关键词：空化模型数值分析水下射流空泡率气泡半径平均流场 STOKES 可压缩流

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Numerical analysis of cavitation cloud shedding in a submerged water jet

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