孔状通气条件下潜射航行体流体动力特性研究

Research on Hydrodynamic Characteristics of Submarine Launched Vehicle with Ventilation Holes

基于均质平衡流理论,通过求解混合介质的RANS方程、SST湍流输运方程和各相之间的质量输运方程,开展了孔状通气条件下气—水—汽三相潜射航行体流体动力特性的三维数值模拟研究,对比分析了不同通气孔数量条件下空泡形态、航行体周向压力分布以及阻力变化情况。结果表明:随着通气孔数量的增加,单个孔形成的空泡尺度减小,空泡整体形态由离散分布逐渐融为一体;迎流面最大压力随通气孔数量增加基本呈减小趋势变化,表面压力沿牵连速度方向分布存在波动现象,并且具有一定的周期性;总阻力系数随通气孔数量增加而减小,通过增加通气孔数量有利于改善航行体的流体动力。

Based on the theory of homogeneous equilibrium flow, the three-dimensional numerical simulation research on the hydrodynamic characteristics of submarine-launched vehicle with ventilation holes of gas-water-vapor three-phase is conducted by solving the RANS equations of mixture media, SST turbulence transport equations and the mass transport equations among phases. The cavity shape, pressure dis- tribution and change of drag force in the case of different numbers of ventilation holes are compared and analyzed. The results show that the cavity dimension formed by a single hole decreases, and the whole cavity shape is integrated gradually from discrete distribution with the increase in the numbers of ventilation holes; the maximum pressure of the upwind surface decreases with the increase in the numbers of ventilation holes, and the surface pressure fluctuates along the velocity direction; the total drag coefficient decreases with the increase in the numbers of ventilation holes, and the hydrodynamic characteristics of submarine-launched vehicle could be improved by increasing the numbers of ventilation holes.