空化模型在非定常空化流动计算的应用评价与分析

摘要

To investigate the application of the Kubota and Singhal cavitation models for unsteady cavitat-ing flows, the cloud cavitating flow around a Clark-Y foil is numerically simulated by using the two cavitation models, respectively. The predictive capability of the two cavitation models is assessed with experimental results of the cavity flow structure, including the average velocity and vorticity. It is shown that the results based on the Singhal model are more accordant with the experimental phenomenon. The Singhal model can capture the detailed process of the vortex shedding in the rear part of the cavitation region, which is observed in the experiment.%文章基于试验观测数据评价了Kubota与Singhal两种空化模型在非定常云状空化流动数值模拟中的应用.采用商业软件的二次开发技术将两种空化模型引入了计算软件,针对绕Clark-Y水翼的云状空化流动进行数值计算,并与水洞试验结果进行了对比.结果表明,两种空化模型计算的云状空化阶段的流场时均速度分布以及涡量分布具有明显的不同.采用Singhal空化模型可以得到和试验观测更加相近的空化旋涡区与空泡云的旋涡分离的脱落形式.