Abstract
Detonation decay and flame propagation in hydrogen–air mixture were experimentally investigated in the channels with solid walls and two types of porous materials on the walls: steel wool and polyurethane foam. Shock wave pressure dynamics inside the section with porous coating were studied using pressure sensors; flame front propagation was studied using photodiodes and high-speed camera. For all mixtures, the detonation wave was formed before entering the section with porous coating. In both porous materials, the stationary detonation wave was decoupled in the porous section of the channel into the shock wave and the flame front with velocity around the Chapman–Jouguet acoustic velocity. By the end of the porous section, the velocity and shock wave pressure were significantly lower in case of using steel wool.
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