【作者】 周后村； 向敏； 武泽平； 张为华；

【Author】 ZHOU Hou-cun;XIANG Min;WU Ze-ping;ZHANG Wei-hua;National University of Defense Technology;

【机构】 国防科学技术大学；

【摘要】 空化现象广泛存在于水翼、螺旋桨、涡轮泵等水力机械中,准确预示空化现象对水力机械性能分析具有重要的意义。空化模型是描述自然空化过程质量传输的重要模型,对空化数值计算结果具有较大影响。本研究基于OpenFOAM开源软件平台,以二维翼型为对象,开展Kunz空化模型中汽化、凝结经验常数取值对空化流场数值模拟结果影响分析,并采用序列近似优化方法对空化模型参数开展优化研究。利用二维翼型不同工况下水洞试验结果对优化结果进行对比,验证优化后的模型参数的合理性。更多还原

【Abstract】 Cavitation is widely observed in hydraulic machineries,such as hydrofoils,propellers and turbines etc.It is important to accurately predict the cavitation phenomenon.Cavitation model is the basic model that describes the mass transfer between the liquid phase and vapor,it has a profound impact on the numerical simulation of the cavitating flow.In this paper,some numerical cases were carried out to investigate the effect of cavitation model parameters on the flow based on OpenFOAM software.The sequential approximate optimization method was used to get the optimal condensation and evaporation coefficients of the cavitation model.Finally,some validation cases based on the 2 D NACA66(MOD) hydrofoil under different conditions were also carried out for the optimized coefficients.更多还原