水下航行体垂直发射尾空泡生成演化过程三维数值研究

Three-dimensional numerical study on the evolution process of tail bubble of underwater vehicle vertical launching

为研究水下航行体垂直发射尾空泡生成演化过程,采用Mixture多相流模型、标准k-ε湍流模型和动网格方法求解RANS方程,建立了三维三自由度计算模型,对航行体垂直发射过程进行了数值模拟,计算结果与试验结果吻合较好,获得了尾空泡生成演化的周期性特征。研究了牵连速度和发射水深对尾空泡生成演化的影响,结果表明,牵连速度增大导致拉断后回射流上升斜切尾空泡的角度增大;发射水深增加导致尾空泡压力增大,振荡周期缩短。

To study the evolution process of tail bubble of underwater vehicle vertical launching, Mixture model, standard k-ε turbulence model and dynamic mesh method were adopted to establish 3DOF model to carry out numerical simulation of the vertical launching process, the calculation results agreed well with experimental results, the cyclical characteristics of the evolution process of tail bubble was acquired. The influences of transport velocity and launch water depth on the tail bubble evolution process were researched, the results show that the bigger transport velocity, the bigger re-entrant jet flow angle after tail bubble fractures;the bigger launch water depth, the bigger pressure magnitude of tail bubble and the shorter pressure oscillation period.