小孔漏气燃气弹射内弹道模型研究

Internal Ballistic Model of Small Hole Leakage Gas Ejection Device

关键词:  燃气弹射  变深度弹射  内弹道调能  小孔漏气  水下发射

Key words:  Gas ejection  Variable depth ejection  Internal ballistic energy modulation  Small hole leak  Underwater launch

摘要:

针对水下变深度导弹发射问题，提出了通过调节小孔漏气量进而调节发射能量的水下变深度燃气弹射方案。针对该方案的内弹道计算问题：通过三维模型数值仿真与零维模型理论计算的结果比对获取了燃气通过小孔的流量系数；基于小孔流量系数和传统燃气弹射内弹道模型，形成了小孔流动控制模型、低压室零维内弹道模型，最终建立了小孔漏气燃气弹射装置内弹道模型。内弹道模型仿真与实验结果的比对结果表明，该内弹道模型在上下低压室压强峰最大误差小于5%，能满足工程计算精度要求；同时基于该模型进行了内弹道调能研究，结果表明通过调节小孔截面积可以有效的实现导弹变深度发射。

Abstract:

Aiming at the underwater changeable-depth missile launch problem， an underwater variable depth gas ejection scheme by adjusting the air leakage of small hole and then adjusting the launch energy is proposed. Aiming at the problem of interior ballistic calculation of the scheme， the flux coefficient of gas passing through the small hole is obtained by comparing the results between three-dimensional model numerical simulation and zero dimensional model theoretical calculation. Based on the small hole flux coefficient and the traditional gas ejection interior ballistic model， the small hole flux control model and the zero dimensional interior ballistic model of the low pressure chamber are formed. Finally， the interior ballistic model of the small hole leakage gas ejection device is established. The comparison between the simulation and experiment results show that the maximum error of the interior ballistic model in the pressure peak of the low pressure chambers is less than 5%， which can meet the accuracy requirements of engineering calculation. At the same time， the internal ballistic energy regulation is studied based on the model. The results also show that the changeable-depth missile launch can be achieved effectively by adjusting the cross-sectional area of the small hole.