Passage of the combustion wave of a heterogeneous system through a shaped obstacle

The passage of the combustion wave of a titanium powder layer in air through an inert shaped obstacle was studied experimentally. The study showed the possibility of the formation of an inhomogeneous wave-like structure of the front associated with a limited supply of gaseous reagents and the thermal instability of combustion of the titanium powder layer. The conditions of the optimal transition combustion in the presence of gaseous impurities affecting gas exchange in the reaction zone and the stability of the front in the layer system were obtained. It is shown that there exists a phenomenological criterion for assessing the nature of the transition combustion mode of titanium powder depending on the shape of the inert obstacle and the front.