一筒多航行体水下连续发射数值仿真研究

Numerical Simulation Study on Underwater Continuous Launch of the Multi-vehicles in Single Launching Tube

一筒多航行体水下连续垂直发射过程中,内置发射邻筒之间溢出的燃气与水交互形成复杂形态燃气泡,而燃气泡的膨胀-收缩特性会对水下连续发射流场产生影响。为了研究航行体连续发射过程中筒口压力场及其对弹体流体载荷特性影响变化规律,利用VOF多相流模型和用户自定义函数控制的动网格技术,取发射间隔为2 s,两发航行体连续发射过程进行数值模拟。仿真结果表明,首发航行体离筒后,经历1 s时间历程,筒口压力场的脉动明显减弱,次发航行体离筒后,筒口流场呈现明显的非对称分布;首发航行体离筒形成的筒口气泡为后续航行体发射通道上创造气幕环境,使得次发航行体轴向载荷Fx减小,以及对筒口的相邻设备亦起到了降载效果,但筒口气泡的不对称发展导致了航行受到的偏转力与偏转力矩出现剧烈震荡,从而将影响航行体初始弹道。该研究结果可以为一筒多航行体水下发射方案论证提供参考。

In the process of underwater continuous vertical launch of the multi-vehicles in single launching tube,the gas overflowing between the built-in neighbouring launch tube interacts with the water to form a complex form of gas bubbles,and the expansion-contraction characteristics of the gas bubbles affect the flow field of the underwater continuous launching.In order to investigate the variation laws of the pressure field near outlet and its impact on the fluid load characteristics during the continuous launching process of the vehicle,numerical simulations are conducted using the VOF multiphase flow model and dynamic mesh technology controlled by user-defined functions,with a launching interval of 2 seconds for the continuous launching process of two vehicles.The simulated results show that when the first vehicle leaves the launch-tube,going through 1s time course,the pulsation of the launch outlet pressure field is significantly weakened,and after the secondary vehicle leaves the cylinder,the launcher flow field shows an obvious asymmetric distribution;The outlet bubble formed when the first vehicle leaving the launcher,which creates an air curtain environment on the subsequent vehicle launch channel,it reduces the axial load Fx of the secondary vehicle and also reduces the load of the adjacent equipment of the barrel mouth,but the asymmetric development of the outlet bubble leads to violent oscillations in the deflection force and deflection moment of the voyage,which will affect the initial trajectory of the vehicle.The research results may provide reference in the field of demonstration of underwater common frame launch scheme for engineering application.