Experimental And Numerical Simulation Research Of Flame Propagation Of Methane Explosion In A Pipe

Methane explosion is one of the main disasters in our life and the process of industrial production.It is beyond our control once the explosion take place.Therefore,to study the flame propagation properties of methane explosion in the pipeline will lay the foundamental reseach for the prevention of methane explode in the pipeline and the confined space.In this paper,we uses the experimental systems of visualized flame propagation, study the properties of the flame propagation of methane explosion in different concentrations in a vertical explosive pipe with small size of the length*width 80 mm × 80 mm × 600 mm,with the help of the image processing of Matlab,the velocities of flame propagation were obtained through the analysis of the pictures of flame propagation. At last, apply the FLACS software to simulate the properties of methane explosion flame propagation under different venting conditions.The results show that the explosive range of methane concentration was 5.5%-15.5%in the pipeline T he explosion induction period shortened un condition that the methane concentration increases.The concentration range of "tulip" flame in a vertical pipe of methane explosion flame propagation was 9%-11 %. The velocity of explosion flame propagation rose to the peak rapidly in the early stage and falls later, along with the spread of flame, the velocity of flame shows in shock trend.The maximum concentration of various concentrations of methane explosion flame propagation velocity peaks was at 10% the maximum value is 35m/s, and then decreases with the increase in methane concentration at first. As a result of venting effect,pressure peaks after venting action returned to normal pressure, explosion flame propagation pressure tends to increase. Methane explosion pressure peaks at a concentration of 10% to reach the maximum, and then decreases with the increase in methane concentration increases first. Then increasing with the increase of methaneconcentration to decrease small.Methane explosion maximum pressure value is 0.498 Mpa,the highest methane explosion flame temperature is 1690 ℃. The FLACS numerical simulation results were coincide with the experiment results The results of methane explosion flame simulation under different venting conditions show that the methane concentration of 10%,the venting of methane explosion mouth open flame propagation under conditions not formed during the "Tulip" flame; venting port venting the greater the degree of each concentration methane explosion pressure peak, the lower explosive flame temperature, the faster the explosion flame propagation, namely T venting mouth closed> T venting mouth has the venting> T venting mouth open,P venting mouth closed> P venting mouth has the venting> P venting mouth open,V venting mouth closed<V venting mouth has the venting<V venting mouth open.