火炮内弹道出口速度优化控制仿真研究

Simulation Research on Outlet Velocity Optimal Control of Gun Interior Ballistic

火炮内弹道的分析和研究一直以来是火炮技术的关键领域,而火炮内弹道出口速度则是其重要分析参数之一。通过对电热化学炮出口速度进行优化控制的研究,可以为实际试验与火炮安全性设计提供更良好的安全性设计方案。在建立仿真模型中,对等离子体射流的处理则是其关键与难点。通过ANSYS FLUENT计算平台,采用湍流模型,将等离子体射流加入到气相源项中,通过改变源项,实现了不同等离子体的射流功率和作用范围下的内弹道二维非稳态仿真,获得了膛底压力和弹丸初速的分布。计算结果表明:最大膛压和弹丸到达炮口时的初速会随着等离子体射流功率的升高而增大,最大膛压和弹丸到达炮口时的初速都会随着等离子体作用范围的增加而增大,其中最大膛压增长的幅值会随着等离子体作用范围的增加越来越大,而弹丸到达炮口时的初速增长的幅值则会随着等离子体作用范围的增加慢慢减小。因此,在火炮设计时可以考虑采用较高的等离子体射流功率来实现对弹丸出口速度的增加,同时也可以适当增加等离子体射流的作用范围,但不宜过大。

Gun interior ballistic outlet velocity is one of the important analysis parameters of gun interior ballistic analysis and research,which is the crucial area of gun technology. The research on the optimization control of the electrothermal chemical gun outlet velocity can provide better security design scheme for practical experiment and gun safety design. The disposition of plasma jet is the key and difficult issue in building simulation model. Internal ballistic two-dimensional unsteady simulation with different plasma jet flow power and range of action is realized by ANSYS FLUENT on the basis of using turbulence model,adding plasma jet into gas source term and changing source term.The distribution of gun pressure and projectile velocity were obtained. The results show that the maximum gun pressure and projectile velocity increase with the increase of the plasma jet power and action range. The growth amplitude of the maximum gun pressure increases with the increase of the plasma action range,and the growth amplitude of projectile velocity decreases with the increase of the plasma action range. Therefore,it can be considered to use higher plasma jet power to increase the projectile exit velocity and increase the action range of plasma jet appropriately,but cannot be too oversized.