水下炮弹前激波特性分析

针对水下炮炮口打开时海水倒灌进入身管的问题,提出增加炮口密封装置,提高弹前激波压力并利用该激波短时间排水的方法.首先根据两相流理论建立数学模型,计算得到激波达到排水能力的时候所需要的压强;再建立弹丸在膛内运动的2维模型,并利用CFD动网格进行仿真分析得到了弹前激波压强变化及发展规律;最终综合各种影响因素确定合理的密封装置打开时间.结果表明:当t=3.673 ms,炮口激波压强达到10 MPa时,打开炮口装置较合适,既可以在打开前保证激波压力适当增大,又可以保证打开后形成的炮口流场有较好的排水效果.

Characteristic Analysis of Shock Wave Before Underwater Gun

To solve the problem of underwater gun that keeping the sea water from flowing back into the barrel, a sealing device is added to enhance the pressure of the shock wave before the projectile, so the shock wave is strong enough to drainage water in short time. Firstly, a mathematical model is built based on the two-phase flow theory, the pressure which is strong enough to prevent the water is calculated by the model; then a two-dimensional model about the projectile moving in the barrel is built, through the CFD dynamic mesh simulation analysis, the changes and development law of the shock wave is obtained and finally the right time open the sealing device is obtained based on varied influence factors. The results shows that when the time ist=3.673 ms and the pressure is 10 MPa is the right time opening the sealing device thus it can make sure the shock wave is strong enough and the muzzle flow field formed by the shock wave and the water has good drainage effect.