Attenuation of shock wave by porous materials
Attenuation of shock wave by porous materials
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DOI：
10.1007/978-3-540-27009-6_193
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
K. Kitagawa;M. Yokoyama;M. Yasuhara
中科院分区：
文献类型：
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作者：
K. Kitagawa;M. Yokoyama;M. Yasuhara
对冲击气流在多孔介质中的衰减进行了实验和数值研究。当冲击气流通过多孔材料如聚氨酯泡沫或金属丝网时，会发生冲击衰减过程。使用的泡沫具有高孔隙率，孔隙率= 0.951 ~ 0.977，低密度，孔隙率=27.6 ~ 55.8 kg/m3，而丝网具有低孔隙率，孔隙率=0.36。激波管实验采用直径50 mm、长6.4 m的激波管进行。固定泡沫后的压力从入射冲击压力降低，这意味着冲击波很好地退化，在某些情况下，成为压缩波。由泡沫的存在引起的压力衰减因子Ka被估计为在没有泡沫值的情况下的值的约60 - 75%。
Attenuations of shocked gas flow propagating through porous materials, are investigated experimentally and numerically. Process of shock attenuation occurs when shocked gas flow travel through porous materials such as polyurethane foam or wire mesh. Foams used have high-porosities ϕg= 0.951 ∼ 0.977 and low densities ϱc=27.6 ∼ 55.8 kg/m3, while the wire mesh has low-porosity ϕg=0.36. Shock tube experiments are conducted by using a shock tube with 50 mm in diameter and 6.4m in length. Pressures behind the fixed foam were decreased from the incident shocked pressure, which implies that the shock wave was well degenerated, and in some cases into compression waves. Pressure attenuation factor Kacaused by the presence of foam was estimated to be about 60 ∼ 75 % of the value in the absence of foam value.