埋头弹装药药粒破碎模型研究

Study on model of grain fracture in charge structureof cased telescoped ammunition

基于埋头弹特殊的装药结构及二次点火程序,结合点传火异常导致的火药颗粒破碎特征,提供了一种理想的破碎模型,通过改变形状特征量参数模拟药粒破碎,建立考虑破碎的零维内弹道模型,预测发射药粒破碎对埋头弹火炮内弹道性能的影响。数值结果表明:火药药粒若发生破碎,埋头弹最大膛压P_(m)和弹丸初速v都会增加,P_(m)提高15.7%,v提高3.4%,破碎增压特性尤为突出;火药颗粒破碎越厉害,越早破碎,P_(m)和v增加得越多,膛内变化越剧烈。

Based on the special charge structure and secondary ignition program of CTA,combining characteristics of powder particle breakage caused by abnormal ignition transfer,an ideal broken model was provided.The particle breakage was simulated by changing the shape characteristic parameters.A zero-dimensional interior ballistic model considering fragmentation was established,which predicts effect of projectile breakage on interior ballistic performance of CTA.The numerical results show that the maximum bore pressure and muzzle velocity of projectile will increase to a certain extent if the powder particle is broken.When severe crushing occurred,they increased by 15.7% and 3.4%respectively.The more severe the particle breakage of gunpowder is,the earlier it is broken,the more the maximum bore pressure and the muzzle velocity of projectile increase,and the more dramatic the changes in the chamber.