垂直发射水下航行体的通气空化数值模拟研究

基于均相流模型对垂直发射水下航行体周围的通气空化流动进行了三维数值模拟,通过与试验得到的压力数据比较验证了数值方法的可靠性,并讨论了通气时序对通气空化流场的影响。结果表明:计算结果与试验吻合较好,通气能提高空泡内压力且不同位置压力一致,空泡末端存在回射高压;随着通气时刻提前,泡内压力和回射高压增大;空泡的发展过程伴随着旋涡的形成与演变,通入空泡的气体有3种流向,气体的运动导致空泡内产生多个旋涡,旋涡的种类可以分为3类。

Numerical Investigation of Ventilated Cavitating Flows around a Vertical Underwater-launched Projectile

The numerical simulation of ventilated cavitating flow around an underwater-launched projectile is performed based on a homogeneous model. The simulated results are compared with experimental results in terms of the pressure. The influence of the timing variation of ventilation rate on ventilated cavity development and flow characteristics is analyzed. The research results show that the numerical results are consistent with the experimental results.Ventilation can improve the pressure inside the cavity and the pressure of different locations tends to be same. With the ventilation time earlier, the pressure inside the cavity and the high pressure of re-entrant jet increase gradually. In addition, the formation and evolution of vortex are captured in the process of cavity development. For gas flow characteristics, the gas injection moves towards three directions. The motion of gas leads to the formation of vortex and the vortex can be catalogued into three types.