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《Explosion and Shock Waves》 2004-04
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An optimal analysis of multi-stage explosive acceleratedhigh velocity flyers with the improved Gurney model

SUN Cheng-wei, WEN Shang-gang, ZHAO Feng(Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics,China Academy of Engineering Physics, Mianyang 621900, Sichuan, China)  
Using the multi-stage devices of explosive slab-flyer configuration, a final stage flyer of several centimeters in diameter and at a velocity over 10km/s can be feasibly achieved, which is promising for applications in experiments of high pressure equations of state (EOS), high velocity impacts and so on. The Gurney model for explosive acceleration has been improved in this paper, and employed to analyze the typical two stage device (last flyer-explosive slab-next flyer). A set of equations based on the Gurney model to calculate final velocities of the two flyers has been deduced and agrees well with the experimental data. From the discussion of calculations of the optimal explosive slab thickness, it is concluded that the next flyer's final velocity favorable to full exploit both the last flyer's initial kinetic energy and the slab's explosive energy ranges 2~3 times of the Gurney velocity, and it approaches to the direct elastic impact result with the last flyer as the velocity of which goes rather high.
【Fund】: 国家自然科学基金项目(19882003)
【CateGory Index】: TJ410
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