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本文采用特征线法和有限差分的数值计算方法,对平面炸药在不同端面起爆和不同边界条件下(正向与反向)驱动刚性飞片的问题进行了研究。所得结论是:为要提高炸药能量的利用效率,惰性炮塞的存在是个关键。在一定条件下,反向驱动比正向驱动可使飞片更快加速,以致在爆炸初期,在飞片运动的一定距离内,反向驱动可使飞片速度提高约15—20％。飞片的极限速度与Gurney理论进行了比较,二者符合一致。
In this paper, the characteristic line method and the finite difference numerical method are used to study the problem that a planar explosive can drive a rigid flyer under different end detonations and different boundary conditions (forward and reverse). The conclusion is: In order to improve the utilization efficiency of the explosive energy, the existence of inert plug is the key. Under certain conditions, the reverse drive can accelerate the flyer more rapidly than the forward flyer, so that the reverse flyer can increase the flyer speed by about 15-20% at a certain distance from the flyer during the initial stage of the explosion. The flying speed limit is compared with Gurney’s theory, and the two are consistent.