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摘要: 高能炸药（HE）柱壳沿轴向传播的稳定态爆轰，在置于炸药柱壳内部的泡沫塑料（工作流体）中产生很强的轴向击波，达到极高的压力和能量密度。适当设计，可使工作流体的流动接近一稳定态，与炸药爆轰以相同的相速度前进。击波阵面后的工作流体可用Nozzle流动方程很好地描述[1]，Nozzle收缩段中的流动不受散开段流动的影响。利用这一性质，可以设计出达到极高压力和能量密度的超高速击波管，并且不受管壁物质强度的限制。数值模拟计算给出了上述稳定态物理图象，并显示出开始阶段轴向击波的形成过程及其后对稳定态的逼近，计算结果及物理图象与理论分析符合得很好。Abstract: A phased implosion in a cylindrically high explosive (HE) shell can form extremely high pressures and energy densities in a low-density foam core within shell. In a properly designed system, the flow of compressed foam approaches a steady state nozzle flow with the same velocity as that of detonation. The propagating wave decouples from the flow behind the sonic point. The flow can be used to produce shockless acceleration of masses to hypervelocities. The numerical simulations show the formation of the axial shock from the start to its approaching of its steady state, which is in good agreement with the theoretical analysis.
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Key words:
- phased velocity /
- steady state /
- Nozzle flow
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Menikoff R, Lackner K S. In: Schmidt S C, Dick R D, Forbes J W, et al, eds. Shock Compression of Condensed Matter-1991. Amsterdam: Elsevier Science. Publishers, 1992: 1041-1044; Menikoff R, Lackner K S, Johnson N L, et al. Phys Fluids, 1991, A3(1): 201-218. 刘尔岩, 王元书. 计算物理, 1991, 8(2): 211-215. Courant R, Friedrichs K. Supersonic Flow and Shock Wave. New York: Interscience, 1948. Schmalz R F. Phys Fluids, 1985, 28(9): 2923-2925. McCall G A. A Method for Producing Shockless Acceleration of Masses to Hypervelocity Using High Explosives. La Jolla, CA: La Jolla Institute, LjI-TM-106, 1984. Meier J K, Kerrisk J F. In: Schmidt S. C, Dick R D, Forbes J W, et al, eds. Shock Compression of Condensed Matter-1991. Amsterdam: Elsevier Science Publishers, 1992: 1045-1048. Marsh S P, Tan T H. In: Schmidt S C, Dick R D, Forbes J W, et al eds. Shock Compression of Condensed Matter-1991. Amsterdam: Elsevier Science Publishers, 1992: 1033-1039. -
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