等体积比水雾对冲击波衰减规律研究

为分析水雾对爆炸冲击波的耗散与衰减作用,通过有限元分析方法,在单层网格内建立冲击波作用于同体积比不同尺寸分布的液滴模型,对液滴阻碍冲击波作用的规律进行分析总结,得到结论如下:液滴的存在对冲击波有一定的削弱作用,且在液滴总体积比相同条件下,液滴数目多的工况比冲量衰减更大,可知分散的小液滴对冲击波的衰减作用强于集中的大液滴.0.1 kgTNT在0.2 m爆距产生的冲击波在二维模型中,液滴体积比为2.21×10–3时液滴直径为0.866 mm时冲击波衰减2.06%,液滴直径为0.500 mm时冲击波衰减3.14%,液滴直径为0.354 mm时衰减3.39%.

Attenuation of a shock wave interacting with same volume ratio of water droplets

In order to analyse function of water droplets using for restraint and attenuation of explosive shock wave, a method using numerical simulation, setting several models of single layer in z-axis with equal fiuld volume but different droplets number, analyzing interaction between shock wave and droplets, obtaining some conclusions. Consequently, the ex-istence of droplets actually attenuate explosive shock wave. In the condition of equal droplets volume, a model within more droplets has a higher attenuation ratio, which shows that decentralized samll droplets present better than centralized droplets in defending shock wave. Three droplets in a model with volume ratio of 2.21×10–3 attacked by explosive source of 0.1 kg TNT at 0.2 m, the attenuation ratio of shock wave is 2.06%, it's 3.14% of 9 droplets and 3.39% of 18 droplets.