Experimental Investigation of Premixed Methane-Air Flame Propagation in Tube

摘要

The premixed methane-air flame propagation characteristic is experimentally investigated in the tube (100mm×100mm×1500mm) by using the devices of highspeed color video camera, photoelectric sensors and pressure sensors. The experimental results show that; the pressure and light signals at the same testing point are triggered simultaneously, but the time occurring peak pressure lags behind the time of the maximuM photo voltage and the pressure duration is longer than the light signal's. The explosion pressure and the flame propagation velocity are enhanced remarkably due to the turbulence vortex around the obstacles when placed the repeated baffles in the tube. Under the condition of obstacle D, testing parameters can run up to 0.46MPa and 250m ? s-1 respectively. The process of flame propagation is divided into three stages which are flame growing, accelerating and vanishing ones according to the high-speed color video camera pictures. The experimental results and analysis are of beneficial to decrease the gas explosion hazards in gas transmission pipelines or underground mine roadways, also can provide the reference for designing the reasonable size of gas pipeline.