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Attenuation effect of blast pressure by porous complex mediums

多孔复杂介质对爆破压力的衰减作用

基本信息

批准号：
19560184
负责人：
KITAGAWA Kazutaka
金额：
$ 2.91万
依托单位：
Aichi Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2007
资助国家：
日本
起止时间：
2007 至 2009
项目状态：
已结题

项目摘要

Pressure attenuation effect of blast wave through porous layers and high visco-elastic material are one of the important re-search topics related to safety assessment and prevention from explosion hazards. Part of projects regarding shock wave and blast wave motions in complex multi-phase media investigated the attenuation of strong shock pressure in sand layer, polyurethane foam and glass beads. Peak overpressures in complex particle layer decrease quickly than that in air, as the blast wave is degenerated into compression waves due to its interaction with three-dimensional porosity distribution. Pressure attenuation caused in present complex media are about 90% of the peak overpressure value in air. In the case of interaction between underwater shock wave and high visco-elastic fluid, the diameter of gas bubble and contractile cycle depend on the fluid kinetic viscosity and strength of underwater shock pressure. Peak overpressure in silicon oils decrease to about 40～54% of the incident peak overpressure in water. Impulse of silicon oils increase in accord with the kinetic viscosity ratio.

冲击波通过多孔层和高粘弹性材料的压力衰减效应是与安全评价和爆炸危害预防相关的重要研究课题之一。复杂多相介质中激波和冲击波运动的部分项目研究了砂层、聚氨酯泡沫和玻璃微珠中强冲击压力的衰减。复杂颗粒层中的峰值超压比空气中的峰值超压下降更快，这是由于爆炸波与三维孔隙度分布相互作用而退化为压缩波。在当前复杂介质中引起的压力衰减约为空气中峰值超压值的90%。在水下激波与高粘弹性流体相互作用的情况下，气泡直径和收缩循环取决于流体的运动粘度和水下激波压力的强度。硅油的峰值超压降至水的峰值超压的40~54%左右。硅油的冲量随动粘比的增大而增大。