Experimental study of flame quenching phenomenon of mixed methane and air in the presence of perforated plates and porous barriers in a closed chamber

Investigation the combustion pattern when the flame hits with obstacles is very important to increase safety in various industries. In this paper, the flame quenching behavior with the presence of porous barriers and perforated plates is investigated. In this study, a closed chamber with the presence of porous barriers and 2 mm perforated plates and a high-speed video camera were used to capture the flame propagation behavior process. All experiments were performed at atmospheric pressure. According to the recorded images, the flame quenches in two modes; side wall and head on, after hitting the obstacles. In this study, the effects of the position of obstacles from the ignition system on the flame quenching distance, flame quenching pattern, and flame propagation speed have been investigated. The position of the porous barriers and 2 mm perforated plates is effective in the flame quenching distance. When the perforated plate is 16.6 cm away from the ignition system, the flame quenches after hitting the first obstacle. However, when the porous barrier is located at a distance of 16.6 cm from the ignition system, the flame passes through the barrier after hitting the barrier. According to the results, the presence of porous barriers in a closed chamber compared to perforated plates increases the quenching distance and the speed of the flame tip. For example, with the presence of porous barriers relative to perforated plates, the flame quenching distance increases from 16.6 cm to 25 cm. Also, the flame tip speed has increased by about 128% from 2.5 to 5.7 m/s using porous obstacles.