双锥罩射流侵彻钢靶侵深计算模型

Penetration Depth Calculation Model for Biconical Liner Jet Penetrating into Steel Target

为了完整地描述双锥罩聚能射流侵彻钢靶的全过程,利用冲击波Hugoniot关系修正伯努利方程,结合改进的PER理论推导双虚拟原点,建立了考虑冲击波、射流速度分布及射流状态等影响因素的侵深计算模型。通过试验验证了考虑冲击波、双虚拟原点及射流断裂影响的计算模型能够提高预测侵深的准确性,比较了各分界点因素对射流侵深的影响,获得了炸高及双锥罩结构参数对射流侵深的影响规律。研究结果表明:随着炸高的增大,连续射流与断裂射流分界点的出现将早于冲击波影响分界点;头部速度、拐点速度和侵彻深度均随上锥角的增大而减小;随着上锥高占罩高比例的增大,射流头部速度、侵彻深度逐渐增大,而射流拐点速度呈下降趋势。

In order to describe the whole process of biconical liner jet penetrating into steel target, Bernoulli equation is modified by using shock wave Hugoniot relationship. Double virtual origin is deduced by combining the improved PER theory, and then a penetration depth theoretical model is established by considering the factors of shock wave, jet velocity distribution and jet state. The accuracy of forecasting the penetration depth is improved using the calculation models of shock wave, double virtual origin and jet fracture effect. The influences of demarcation points on penetration depth are compared, and the rules of stand-off distance and bieonical liner structural parameters influencing the penetration depth are obtained. The results show that the demarcation point of continuous and break-up jets occurs earlier than the demarcation point of shock wave effect with the increase in stand-off distance. Moreover, the tip velocity, inflection velocity and penetration depth decrease with the increase in top cone angle. But with the increase in height radio of top cone, the tip velocity and penetration depth increase gradually, and the inflection velocity exhibits a descendant trend.