带凹槽和带凸起的圆盘空化器超空泡流数值研究

Numerical study of supercavity flow of disk cavitator with grooves or convexes

该文基于雷诺平均N-S方程和均质平衡流理论对带凹槽和凸起的圆盘空化器进行了数值模拟,分析了所形成的三维超空泡的形态特征。通过计算圆盘空化器超空泡流并与经验公式对比,验证了数值计算的准确性。分析了空泡面凹凸变化的原因,并给出了空化数对空泡凹凸形态和阻力系数的影响。结果表明,对于带凹槽或凸起的圆盘空化器,空泡面的凹凸分布沿轴向会发生变化。

Based on Reynolds-Averaged Navier-Stokes equations and Mixture-multiphase model, the numerical study of disk cavitators with grooves or convexes is presented to analyze three-dimensional supercavity flow. The numerical simulation is proved to be efficient and accurate by numerically simulating disk supercavity flow and comparing with experiential formula. The results indicate that the shape of cavitator has important influence on supercavity. The shape of supercavity changes along the axis. Analyses of cavitators with grooves or convexes are focus on the reasons of supercavity shape change. The impact of cavitation number on the cavity shape and drag properties are probed.