射流对间隙靶板屏蔽炸药的冲击起爆

为得到射流对野战弹药的冲击起爆规律,以间隙靶板屏蔽炸药模拟具有一定防护的野战弹药,应用冲击波传递的阻抗匹配技术、聚能射流的准定常侵彻理论以及开放炸药冲击起爆的Held准则,构建了射流前驱波与击穿间隙靶板后剩余射流起爆炸药的工程分析模型,并结合算例对模型进行了系统的分析。结果表明:射流侵彻起爆野战弹药过程中,射流直径变化可达到22.2%,对起爆能力的影响不可忽略;弹药壳体对射流起爆能力影响较防护层(包装/方舱)强;前驱波的最大起爆能力约为2.75×104m3·s-2,而剩余射流的最大起爆能力约为1.55×105m3·s-2,二者相差近一个数量级,所以野战弹药应以防射流击穿为主。

Jet Impact Initiation of the Charge Covered with Spaced Target

To get the explosion rule of field ammunition detonated by jet, the explosive with various spaced targets was used as field ammunition simplified model. The jet initiation models of shield explosive were established and calculated by impedance match technology, theory of penetration by quasi-steady fluid dynamics and Held criterion. Results show that the biggest detonating abilities of shock wave and remainder jet are about 2.75×10⁴ m³·s^-2 and 1.55×10⁵ m³·s^-2, respectively, which prove that the primary influence factor of detonating ability is the bomb case comparing with protective coating. During the field ammunition detonated by jet, the changing of jet diameter would be to 22.2% and its influence could not be ignored. Furthermore, preventing the penetration of jet is the first focus of field ammunition, for the detonating ability of remainder jet is more than the shock wave.