Attenuation Of Shocked Gas Flow By Porous Medium
Author(s)
K. Kitagawa, M Yokoyama, M Kainuma, H. Ojima, K. Takayama
& M. Yasuhara
Abstract
Attenuation of shocked gas flow by
porous medium
K. Kitagawal, M. Yokoyamal, M. Kainuma2, H. 0jima2,
KTakayama2 & M. Yasuharal ' ~e~artment of Mechanical Engineering,
Aichi Institute of Technology, Japan.
2~hock Wave Research Center, Institute of Fluid Science,
Tohoku University, Japan.
Abstract
Attenuation of shock waves propagating through porous media is investigated
experimentally and numerically. Unsteady processes occur when
shock waves and expansion waves travel through porous media: such as
a polyurethane foam; and a wire mesh. Foams under study have highporosities
4g = 0.951 - 0.977 and low densities p, = 27.6 - 55.8 kg/m3,
while the wire mesh has low-porosity 4, = 0.36. Shock tube experiments are
conducted by using a shock tube of 50 mm in diameter and 6.4m in length.
Initial pressures in driver tube, P4, and driven tube, PI, are P4 = 0.4345
MPa and PI " 0.1013 MPa, respectively. The resulting shock Mach number
is Ads = 1.33. The foam is fixed onto the shock tube side wall surface o
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