结构参数耦合特性下的燃气弹射内弹道性能预示

现有文献分析结构参数对内弹道性能影响主要基于单一变量法,未从全局考虑参数的耦合特性。建立了从内弹道反向设计方程到正向计算方程的一体化模型,考虑结构参数耦合关系,提出了内弹道设计方程的修正方法,分析了以空间尺寸和时间2个维度为基准的内弹道性能变化规律。仿真结果表明:设计方程推导中的简化造成了较大的截断误差,对理想喉部截面积具有放大作用,且随着低压室直径的增加,放大作用越明显;在设计的出筒速度、高压室工作压强下,低压室直径和高度越小,喉部截面积越小,导弹受到的冲击荷载越大,出筒时间越短;通过选择合理的低压室尺寸能使低压室最大压强和导弹最大加速度任意可调。

Performance Prediction of Gas Ejection Interior Ballistic under Coupling Characteristic of Parameters

Aimed at the problem that the existing literature to analysis influence of structure parameters on the interior ballistic performance is based on the single variable method on no consideration of the coupling relationship between the structure parameters, an integrated simulation model from the opposite design of internal ballistic equation to the positive calculation of interior ballistic equations is established, the coupling relationship between the structure parameters is considered, the modification method of interior ballistic design equation is put forward, and the variation law of interior ballistic performance based on the two dimensions of space dimension and time is analyzed. The simulation results indicate that design equations are derived in simplification causing the truncation errors and magnifying ideal throat area, and with the increase of low pressure chamber diameter the amplification becomes obviously. In designing a particular cylinder velocity and working pressure of high pressure chamber, the smaller the initial diameter and the height of the lower pressure chamber is, and the smaller the throat area is, and the greater the impact load of the missile is, and the shorter the movement time of the missile is. Choosing a reasonable size of the low pressure chamber can make the maximum pressure of the low pressure chamber and the maximum acceleration missile arbitrarily adjustable.