基于滤波器湍流模型的水翼空化数值模拟  

Numerical simulation of hydrofoil cavitation based on filter-based model

作　　者：谭磊[1] 曹树良[1] 

机构地区：[1]清华大学热能工程系水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《江苏大学学报（自然科学版）》2010年第6期683-686,共4页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50776052);国家"863"计划项目(2008AA05Z201)

摘　　要：采用界面捕获法,在均相流模型假设下,引入滤波函数修正了RNGk-ε湍流模型,基于正压流体假设的状态方程空化模型.采用SMPLEC算法,数值求解雷诺平均的Navier-Stokes方程,模拟了二维NACA66(Mod)翼型的定常、非定常空化流动.计算得到的翼型表面压力分布与试验结果基本一致,较好地模拟了非定常空化云的初生、发展、断裂和脱落的周期性过程,非定常流动的斯特劳哈数与试验结果相吻合.给出了2个时刻的翼型表面速度矢量场,分析了空泡内部流动结构,结果发现翼型空泡尾部的反向射流是引起翼型表面局部压力升高,进而导致空泡发生断裂及空化云脱落的重要原因.Based on the cavitation model of state equation with the barotropic fluid assumption,and by introducing the filter function to modify the RNG k-ε turbulence model,the Navier-Stokes equation is solved with SIMPLEC algorithm to simulate both steady and unsteady cavitating flow around a hydrofoil.The calculated pressure distributions on foil section agree well with the experimental results.The periodic and the complex phenomenon of evolution of unsteady cavitating flow is well simulated.The strouhal number coincides with the experiment results.The velocity vector distribution around the foil and the internal flow structure of the cavity are analyzed.The local pressure rise on hydrofoil surface and the break-off process are mainly caused by the re-entrant jet.

关 键 词：空化模型 滤波器湍流模型 状态方程 反向射流 数值模拟 

分 类 号：TH312[机械工程—机械制造及自动化]