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利用动网格技术对导弹从点火到出箱整个发射过程的非定常流场进行了仿真,重点分析了导弹发射时弹体受到的温度和压力载荷特性。计算结果表明,燃气流对导弹的载荷主要呈现三个特征:导弹点火后燃气对弹体有一个瞬间温度和压力冲击;导弹出箱后,由于箱内燃气流的溢出和箱口结构对燃气流的阻挡作用,高温燃气冲击导弹,使得导弹受到第二个温度冲击;在点火后约0.3~0.4 s,由于核心段冲击到箱壁形成反射,箱内燃气流场出现较大的波动现象。
The unsteady flow field of the missile from ignition to the entire launching of the delivery box was simulated by moving grid technology. The temperature and pressure load characteristics of the missile body were analyzed emphatically. The calculation results show that the gas flow has three main characteristics on the load of the missile: once the missile ignites, the gas has an instantaneous temperature and pressure impact on the projectile; after the missile is discharged from the tank, due to the overflow of the gas flow inside the tank and the influence of the structure of the tank mouth on the gas flow After the ignition, about 0.3 ~ 0.4 s, due to the impact of the core section to the tank wall to form a reflection, the gas flow field inside the box appeared larger fluctuations.