Flame front propagation in a channel with porous walls

31st International Conference on Equations of State for Matter

Golovastov, S.V.^1 ; Bivol, G. Yu^1

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13, Moscow

125412, Russia^1

关键词: Absorbing walls;    Flame dynamics;    Flame-front propagation;    Hydrogen-air mixture;    Porous surface;    Rectangular cross-section channels;    Small disturbances;    Sound absorbing;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/774/1/012089/pdf
DOI  :  10.1088/1742-6596/774/1/012089

来源: IOP

【 摘 要 】

Propagation of the detonation front in hydrogen-air mixture was investigated in rectangular cross-section channels with sound-absorbing boundaries. The front of luminescence was detected in a channel with acoustically absorbing walls as opposed to a channel with solid walls. Flame dynamics was recorded using a high-speed camera. The flame was observed to have a V-shaped profile in the acoustically absorbing section. The possible reason for the formation of the V-shaped flame front is friction under the surface due to open pores. In these shear flows, the kinetic energy of the flow on the surface can be easily converted into heat. A relatively small disturbance may eventually lead to significant local stretching of the flame front surface. Trajectories of the flame front along the axis and the boundary are presented for solid and porous surfaces.