Influence of Water Mist and Sliding Device on Explosion Characteristics of Premixed Methane/Air

A large number of methane explosion accidents show that premixed methane/air gas explosion is easy to cause huge casualties and property losses. The influence of the water mist cooperating with sliding device on the explosion characteristics of methane was explored by using the 10 cm × 10 cm × 100 cm transparent experimental pipe, and the explosion flame and overpressure was analyzed emphatically. The results show that the effect of water mist on the overpressure in the combustion zone is little under the synergistic effect. It has a significant attenuation effect on the peak overpressure in the unburned zone, and the maximum attenuation is 44.41% when the methane concentration is 11.5%. The water mist can destroy the finger flame and accelerate the flame propagation. When the methane concentration is 11.5%, the flame propagation speed increases by 62.50%. The sliding device reversely compresses the flame to the water mist action area to accelerate the flame extinction. When the methane concentration was 9.5% and 11.5%, the flame quenching time decreased significantly, which are 20.76% and 29.65%, respectively. When the methane concentration was 7.5%, the flame quenching time decreased by 3.5 ms.