Dynamic and evolution of the CH4 explosion with different vent tube diameters

CH 4 explosion in a confined space will cause serious harm, and the vent tube can realize the directional venting of the explosion. Through the explosion experiment and numerical simulation of 8 vol% CH 4 , the impact of tube diameter on CH 4 explosion venting was studied. The findings show that the tube diameter affected the pressure accumulation and pressure venting efficiency in the tube, and the maximum explosion pressure decreased as the tube diameter increased. The diameter of the tube affected the velocity and pressure of the venting airflow. When the tube diameter was 70 mm, the maximum explosion pressure decreased by 41.67 %. When the tube diameter was 30 mm, bright and clear Mach disks structure appeared, while the Mach disk structure did not appear when the tube diameter was 70 mm, the maximum flame length and velocity were achieved, 805 mm and 359.55 m/s, respectively. Through numerical simulation, the explosion of CH 4 was reproduced under both closed and venting conditions, and the temperature field resulting from the CH 4 explosion was constructed. This study can provide data reference for optimizing the safety design of fuel power plants and industrial heating equipment and reduce the risk of explosion.