内弹道计算对炮弹发射有重要意义。文中研究了迫榴炮发射迫弹时的内弹道模型,将膛内气体流出过程类比喷管气体流动过程,针对气体流出量的计算进行了详细的讨论。然后在Matlab软件中运用四阶Runge-Kutta法对某型120mm自行迫榴炮发射迫击炮弹内弹道过程进行插值求解,并用CFD++软件对发射过程进行仿真。利用该模型计算所得膛压及出炮口速度与实验所测基本一致,火药气体流动状态与仿真结果相符,仿真与实验结果均证明了该模型的正确性、可靠性。

Interior ballistics calculation had significant value to the projectile launching. In this paper, the interior ballistic model of the howitzer projectile was studied, and the process of the gas flow in the nozzle was compared with that of the process of the gas flow in the chamber. The calculation of gas outflow was discussed in detail. Then, the Matlab software was used to solve the interpolation of interior ballistic process of a 120 mm self-propelled howitzer fired mortar projectile by using the fourth-order Runge-Kutta method, and the launching process was simulated by CFD + + software. The chamber pressure and the muzzle velocity calcalated by using the model were consistent with the experimental measurement results, and the propellant gas flow state and the simulation results were consistent. Thus, the model in this study was proved to be accurate and reliable.