Using a combination of experimental and numerical simulation methods to study the premixed gas deflagration flame propagation in the flat slit. In this paper

the use of high-speed digital camera system for catching the propagation principle

and the result shows that the extinguish length and the critical flame propagation speed displays approximately linear when there is a certain slot height. By studying the intrinsic link of the propagation exothermic chemical reaction

Wall heat dissipation and so on with the flame propagation and extinguish states

looking the inherent propagation and extinguish laws of premixed flame propagation in a flat slit. Judging whether the flame quenching slit to provide a reference.To provide theoretical support for the selection and design of the flame arrester core .