Flame stabilization in a narrow slot in an expanding gas flow

Conditions of flame stabilization in a narrow gap between two circular plates with gas injection through the center of one plate are considered. Lean hydrogen-air mixtures are used as a combustible gas. It is shown that the flame can become stabilized under certain conditions either at the tube exit, at the point of injection of the combustible mixture into the slot, or at a certain distance from the point of injection. Stable existence of such flames is observed even if the slot width is smaller than 0.1 mm. The burner walls are substantially heated in both cases. The basic trends of the flame behavior are found for the second case with variation of the flow rate of the combustible gas, composition of the mixture, and slot width.