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首页> 外文会议>ASME international mechanical engineering congress and exposition >DESIGN CONSIDERATIONS FOR COMPRESSION GAS DRIVEN SHOCK TUBE TO REPLICATE FIELD RELEVANT PRIMARY BLAST CONDITION
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DESIGN CONSIDERATIONS FOR COMPRESSION GAS DRIVEN SHOCK TUBE TO REPLICATE FIELD RELEVANT PRIMARY BLAST CONDITION

机译：压缩气体驱动的冲击管重复现场相关爆破条件的设计注意事项

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Detonation of a high explosive (HE) produces shock-blast wave, noise, shrapnel, and gaseous product; while direct exposure to blast is a concern near the epicenter; shock-blast can affect subjects even at farther distances. The latter is characterized as the primary blast with blast overpressure, time duration, and impulse as shock-blast wave parameters (SWPs). These parameters in turn are a function of the strength of the HE and the distance from the epicenter. It is extremely important to carefully design and operate the shock tube to produce a field relevant SWPs. In this work, we examine the relationship between shock tube adjustable parameters (SAPs) and SWPs to deduce relationship that can be used to control the blast profile and emulate the field conditions. In order to determine these relationships, 30 experiments by varying the membrane thickness, breech length (66.68 to 1209.68 mm) and measurement location was performed. Finally, ConWep was utilized for the comparison of TNT shock-blast profiles with the profiles obtained from shock tube. From these experiments, we observed the following: (a) burst pressure increases with increase in the number of membrane used (membrane thickness) and does not vary significantly with increase in the breech length; (b) within the test section, overpressure and Mach number increases linearly with increase in the burst pressure; however, positive time duration increases with increase in the breech length; (c) near the exit of the shock tube, there is a significant reduction in the positive time duration (PTD) regardless of the breech length.
机译：高爆炸物（HE）的爆炸会产生冲击波，噪音，弹片和气体产物。在震中附近，直接暴露于爆炸是一个令人担忧的问题;冲击波甚至可以在更远的距离影响对象。后者的特征是初次爆炸，具有爆炸超压，持续时间，以及冲击波作为冲击波参数（SWPs）。这些参数反过来又是HE强度和距震中距离的函数。仔细设计和操作减震管以产生与现场相关的SWP极为重要。在这项工作中，我们检查了冲击管可调参数（SAP）和SWP之间的关系，以推导可用于控制爆炸轮廓和模拟田间条件的关系。为了确定这些关系，通过改变膜厚度，后膛长度（66.68至1209.68 mm）和测量位置进行了30次实验。最后，ConWep用于比较TNT冲击波轮廓与从冲击管获得的轮廓。从这些实验中，我们观察到以下情况：（a）爆破压力随使用的膜片数量（膜厚度）的增加而增加，并且不随后膛长度的增加而显着变化; （b）在试验区内，超压和马赫数随爆裂压力的增加而线性增加;然而，随着臀长的增加，正时长会增加; （c）在激波管的出口附近，无论后膛长度如何，正向持续时间（PTD）都会大大减少。

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