摘要
应用二维不可压缩N-S方程结合改进VOF空化模型模拟了NACA66二维翼的空化流动。数值计算中采用SSTk-ω湍流模型计算了不同空泡数下定常稳态空化发生时水翼吸力面的压力分布,并与实验结果进行对比,发现空化末端压力梯度计算值明显大于实验值,而且压力有明显突增,通过修正空化模型中的经验参数较好地解决了这个问题。应用SST-SAS湍流模型及修正的经验参数较好地模拟了低空泡数时非定常云空泡的脱落现象,该数值方法对非稳态空化的发展,脱落过程及其频率的预报结果与实验结果吻合良好。
Cavitating flow around a 2-dimentional NACA 66 hydrofoil was simulated using 2D incompressible Navier-Stokes equation with modified VOF cavitation model. In the numerical modeling, the pressure distribution on the suction side was calculated for different cavitation numbers using SST k-ε turbulence model. The calculated pressure gradient is quite steep and the pressure has an obvious peak in the closure region of the cavity, which does not well agree with experimental results. The problem was solved by modifying the empirical parameters of the cavitation model. Then, the unstable cavity shedding at lower cavitation numbers can be well predicted using SST-SAS turbulence model and the modified empirical parameters. The calculated results show that the predicted cavity growth and shedding process and its frequency agree well with experimental data.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2009年第6期740-746,共7页
Chinese Journal of Hydrodynamics
基金
海洋工程国家重点实验室研究基金资助项目(0719)
海洋工程国家重点实验室研究基金资助项目(0811)
关键词
VOF空化模型
湍流模型
空泡脱落
VOF cavitation model
turbulence model
cavity shedding
