水下航行体垂直发射环境流场与弹道耦合数值模拟研究

Investigation on the Vertical Launching Process of the Underwater Vehicle by Couple the Flow Field and the Hydro-ballistics

本文采用Mixture多相流模型、标准 k-ε湍流模型和动网格技术对水下航行体发射过程进行了三维非定常求解。通过对航行体水下发射过程多相流场及弹道耦合计算,获得了航行体表面压力以及流场三维特性分布,探讨了发射平台运动速度以及发射水深变化对航行体受力和运动特性的影响。研究结果表明,发射平台运动速度的增加会引起航行体所受环境法向力和俯仰力矩的增加,直接导致其出水过程横向速度和俯仰角速度的变化量线性增加;发射水深的增大会影响航行体的出水时刻,但其对航行体所受水动力及运动特定的变化影响较小。

Three-dimensional (3D) numerical simulation of underwater vehicle vertical launching process was carried out by solving the unsteady RANS equation with a Mixture model, the standard k-ε model, and dynamic mesh technique. The multiphase flow field was solved by coupling with the vehicle hydro-ballistics. The characteristics of 3D vehicle surface pressure and hydro-dynamical forces were acquired. The influences of launch platform speed and launch water depth on fluid dynamics and movement velocity were researched. Results show that the growth of movement velocity would lead to the bigger normal component of fluid dynamics and pitching moment which cause the increase of the lateral velocity and pitching angular velocity;the increasing launch water depth would delay the water-exit of vehicle, but has little effect on the characteristics of vehicle fluid dynamics and movement velocity.