BLAST PRESSURE MITIGATION USING PERFORATED PLATES

I. S. Sandhu, Rahul Mankotia, M. B. Kala, A. Agarwal, D. R. Saroha
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Abstract

The detonation of an explosive system creates high-pressure blast wave in the adjoining media. The interaction of blast wave can inflict severe injuries to humans and catastrophic damage to structures. Many materials such as foams, soil etc., and techniques e.g. reflecting plates, perforated plates, and metallic grids are studied in literature to mitigate the deadly effects of blast waves. In the present experimental study blast wave generator (a short driver section shock tube) is used for the evaluation of blast pressure mitigation in perforated plates of different blockage ratios and hole configurations. These plates with blockage ratio (BR) from 78.79% to 93.43% were deployed inside the driven section of the blast wave generator at a suitable distance from the diaphragm so that blast wave loading occurs on perforated plates. The strength of transmitted blast wave through different plates is measured in terms of peak over pressure using piezoelectric pressure sensors deployed downstream at 0.2m and 0.48 m distances from the perforated plates. The measured strength of the incident blast wave was found to reduce by about 36% to 65% at 0.2 m and about 37% to 73% at 0.48 m downstream through different blockage ratio plates. It was observed from the recorded data that transmitted pressure decreased with an increase in blockage ratio. In the case of the same blockage ratio, the decrease in pressure for a plate with circular holes was more in comparison to a plate having triangular holes and a central hole.
利用穿孔板减轻爆炸压力
爆炸系统的爆炸在邻近介质中产生高压冲击波。爆炸冲击波的相互作用会对人体造成严重伤害,对建筑物造成灾难性破坏。许多材料,如泡沫、土壤等,以及技术,如反射板、穿孔板和金属网格,在文献中进行了研究,以减轻爆炸波的致命影响。本文利用冲击波发生器(短驱动段激波管)对不同堵塞比和孔型穿孔板的爆破压力缓解进行了实验研究。这些堵塞比(BR)在78.79% ~ 93.43%之间的板,被布置在离膜片适当距离的爆炸波发生器驱动段内,使爆炸波加载发生在穿孔板上。利用压电压力传感器,在距离穿孔板0.2m和0.48 m的下游位置,以峰值超压的方式测量了通过不同板的传播冲击波的强度。通过不同堵塞比板,入射冲击波的强度在下游0.2 m处降低约36% ~ 65%,在下游0.48 m处降低约37% ~ 73%。从记录的数据中观察到,随着堵塞比的增加,传递压力降低。在相同堵塞比的情况下,圆形孔板的压力下降比三角形孔和中心孔板的压力下降更大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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