加速膛孔径对冲击片换能元换能特性的影响

加速膛在冲击片换能元中起着剪切飞片和提供飞片加速通道的功能，其孔径对飞片速度形态有重要的影响。本文中，研究不同加速膛孔径对冲击片换能元在不同回路参数条件下的爆发电流和飞片速度的影响规律，并且与数值模拟计算结果进行对比。结果表明，在相同的短路电流峰值和桥箔条件下，加速膛孔径对桥箔的爆发电流没有明显影响，但是对飞片速度有较大影响。加速膛孔径增加，飞片面积增加，飞片速度相应减小；但是飞片面积存在着一个最大值S_max，当加速膛孔的面积大于S_max时，飞片的面积会保持为一定值，不再随着加速膛孔径的增加而变化，此时加速膛失去剪切飞片的功能，只是保留了提供飞片加速通道的功能，从而导致飞片速度不再发生变化。对于文中的起爆回路和桥区尺寸为0.3 mm×0.3 mm×0.005 mm的铜桥箔来讲，可以近似认为S_max=0.3²πmm²，对应的加速膛孔径约为0.60 mm。研究结果为加速膛的孔径设计范围提供依据。

Influence of Barrel Diameter on Energy Conversion Characteristics of Exploding Foil Transduction Unit

The flyer plate is sheared off and accelerates through the barrel to the explosive pellet in the exploding foil initiators. So,the flyer shape is related to barrel diameter. Effect of barrel diameter on exploding current and flyer velocity of exploding foil transduction unit was investigated by experiment and simulation. The results show that exploding current is dependent upon barrel diameters under the same discharging and exploding foil parameters. But the flyer velocity decreases as increasing the barrel diameter because of the increased flyer area. Finally, the shearing function of barrel is eliminated, resulting of maximum flyer area (S_max).So,when the barrel diameter increases into a certain extent, the flyer velocity maintains. For the copper exploding foil with the dimension of 0.3 mm×0.3 mm×0.005 mm,S_max would be 0.3²πmm² corresponding to 0.60 mm barrel diameter.The investigating results provide design qualification for barrel diameters.