Numerical Study on Propagation Lows of Gas Explosion in Roadway

Based on Fluid Dynamics and Combustion Theory, the model of pipeline was created by the software of CFD, and the spread of gas explosion was simulated in the conditions of pipelines of different lengths. The flame speed was obtained, as well as the the law of pressure changing with time in the pipeline. The results showed that the acceleration of flame speed could be divided into three phases: diffuse transmit, rise rapidly, inertial motion; oscillation pressure affected the turbulence of flame and was the significant reason to the rise of flame speed; when the pipeline got longer, the maximal flame speed would be higher, in addition, the transition distance that flame speed rise to a high value would tend to stable.