Interaction of Shock Waves with Gas-Permeable Cellular Porous Materials

This paper presents the results of experimental and numerical simulations of the interaction of plane shock waves with gas-permeable cellular porous barriers that are uniform in thickness or consist of layers of material with pores of different diameters. The experiments were carried out in a shock tube at shock-wave Mach numbers $${\text{M}} = 1.2{\kern 1pt} - {\kern 1pt} 1.8$$ . Highly porous cellular nickel was used as a gas-permeable material. In the numerical simulation, such cellular porous materials are described by a toroidal model of porous media. The mechanism of formation of reflected waves was determined. It is shown that, in the presence of highly porous gas-permeable cellular barriers, there is a decrease in the intensity of waves reflected directly from the structural elements of the material and the intensity of waves reflected from the rear end of the shock tube. Reflected waves are most effectively suppressed by combined barriers composed of material layers with pores of different diameters.