某底排弹底排装置工作期间内部流场的数值模拟

基于均相流理论和固体火箭发动机原理建立了底排装置一维非定常内弹道模型。采用底排内弹道和修正质点外弹道耦合计算的方法对某155mm底排弹底排装置工作期间的内部流场和外弹道进行了数值模拟。得到了底排装置内压力、温度、密度和速度沿燃气通道轴向分布情况及喷口处的变化规律。计算结果表明,底排装置内的最高温度约为1944K,最大速度约65m.s-1;计算的底排工作时间为24s,增程率约为30%,与实际射击试验平均值吻合较好。

Numerical Simulation of Interior Flow Field in a Base Bleed Unit During Working

A one-dimensional unsteady flow calculation model of a base bleed unit interior ballistics was established based on the theory of homogeneous flow and solid rocket engine. The inner flow field of base bleed unit and exterior trajectory of a base bleed projectile were simulated via calculating interior and exterior equations of base bleed projectile. The distributions of pressure, temperature, density and velocity of gas and their changing laws at nozzle were investigated and obtained. The calculational results show that the highest temperature and velocity of the gas are 1944 K and 65 m·s^-1. The working time of base bleed unit is 24 s and increasing range rate is about 30%. Both of working time and increasing range rate are in good agreement with the results obtained from practical shooting tests.