不同空化模型对附着空化的数值模拟与评价

Numerical Simulation and Evaluation of Attached Cavitation with Different Cavitation Models

为了分析Singhal空化模型及Schnerr-Sauer空化模型在定常空化模拟中的应用,基于雷诺时均(RANS)法,采用Realizable k-ε湍流模型及Mixture多相流模型,通过Fluent 18.2软件,分别使用两种空化模型对攻角为2.5°、雷诺数为2×10^6时的二维Modified NACA0009水翼定常空化现象进行数值模拟,空化数范围为0.75~0.90.对Singhal及Schnerr-Sauer两种空化模型的计算结果进行分析评价,并与文献[9]的试验结果对比分析。结果表明:空穴长度随空化数的降低而增大;两种空化模型计算的水翼前缘附着空化的压力分布具有明显差别,采用Singhal空化模型计算出的空化范围较大;在近壁面和空腔尾流区,两种空化模型均无法精确捕捉复杂的流动现象。

In order to analyze a application of Singhal cavitation model and Schner-Sauer cavitation model in steady cavitation simulation,the steady cavitating flows over a 2D NACA0009(MOD)hydrofoil with angle of attack of 2.5°and Re=2×10^6 are numerically investigated based on RANS method by Fluent 18.2.The Realizable k-εturbenlence model and Mixture multiphase model are used for numerical simulation.The cavitation number is between 0.75 and 0.90.Simulated results of the two cavitation models were analyzed and compared with experimental data.The results show that the length of cavity increases as the cavitation number decreases,and the pressure distributions of hydrofoil leading edge simulated by the two cavitation models are significantly different.The cavitation range simulated by Singhal cavitation model is larger.On the near-wall surface and in cavity wake region,both cavitation models cannot be used to accurately capture complex flow phenomena.