某突击炮炮口流场数值模拟研究

为研究突击炮发射时对炮口周边远、近场响应的影响,进行了某突击炮炮口流场数值模拟与分析。针对突击炮发射穿甲弹的高初速、高炮口压力特点,采用可压气体黏性流动的Navier-Stokes方程,建立炮口流场模型,采用Spalart-Allmaras湍流模型,应用Roe-FDS格式,结合动网格技术,在内弹道参数求解的基础上,进行突击炮炮口流场数值模拟。数值模拟结果得到了突击炮炮口冲击波超压分布与扩展特性,及炮口流场温度分布情况。炮口冲击波在远场的传播主要呈现衰减趋势; 在近炮口区域,受到膛内喷出射流的能量补充及强烈的相互作用,形成超压值较高的近场特性。研究结果对揭示突击炮炮口流场特性,预测炮口冲击波对装备与作战人员的危害具有参考价值。

Numerical Study of Muzzle Flow Field of Assault Gun

To study the effect of muzzle flow field on vehicle body and fighters during the launching course of assault gun,numerical simulation and analysis of muzzle flow field were carried out. Considering the characteristics of high muzzle-velocity and muzzle pressure of assault artillery launching armor-piercing projectiles,the Navier-Stokes equations of viscous flow of compressible gas and the Spalart-Allmaras turbulence model were adopted to establish the muzzle flow-field model. The Roe-FDS scheme and dynamic mesh technique were used to numerically simulate the muzzle flow-field by calculating the interior ballistic parameters. The numerical results show the distribution and expansion characteristics of the muzzle shock wave of assault gun. The propagation of muzzle shock-wave in the far field is mainly attenuated. In the near field,the near field characteristics with high overpressure can form because of the energy supplement and strong interaction of the ejected jet. This work is beneficial for revealing the characteristics of muzzle flow-field of assault guns and predicting the hazard of muzzle shock wave to armament and fighters.