埋头弹药膛内压力波传播模拟研究

Simulation Study on Pressure Wave Propagation in Cased Telescoped Ammunition

建立了中口径埋头弹火炮膛内一维两相流模型,得到了击发底火后弹丸在膛内运动过程气相流和固相流的两相物理参数分布,分析了膛内压力波传播特性。从计算结果看出在该装药条件下第一个正波值最大,为9. 3 MPa,第一个负波值最小,为-10 MPa,波值与两相流速度、空隙率以及颗粒密度在膛内分布有关。点火后压力波幅很快达到最大值,在经过第一个正波和第一个负波后快速衰减,从2 ms开始逐渐缓慢衰减为零。

One-dimensional two-phase flow model of CTA was established.The distribution of two-phase physical parameters during the movement of the projectile in the gun inside after the fire was fired,on this basis,the characteristics of pressure wave propagation in the gun inside were analyzed.It can be seen from the calculation results under the charge condition.The first positive wave value is about 9.3 Mpa,the first negative wave value is about 10 Mpa,the positive and negative values of the wave value are related to the two-phase velocity,void ratio and particle density distribution in the crucible.After ignition,the pressure amplitude quickly reaches its maximum value,and after a first positive wave and a first negative wave,it rapidly decays,and gradually stabilizes from 2 ms until the attenuation is zero.