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

Keywords