Abstract: In order to explore the dual-port synergistic explosion on the restricted space hydrogen-doped methane explosion characteristics, this paper uses the self-built premixed gas explosion experimental platform to carry out experiments on the effects of different areas of the double vent and the location of the explosion on the gas explosion flame and the overpressure. The hydrogen doping ratio in the hydrogen-doped methane was selected as 10%, and three venting sizes of 40 mm, 60 mm, and 80 mm were chosen, with four venting locations of 200 mm, 400 mm, 600 mm, and 800 mm from the ignition source. The experimental results show that the double-ported flame propagation time accelerates with increasing distance of the deflagration position from the ignition source. Based on the analysis of flame speed and pressure, the closer the position of the double explosion vents is to the ignition source, the better the pressure relief effect will be; and the larger the area of the explosion vents is, the better the explosion relief effect will be.

Key words: double ventilated orifice, confined space, hydrogen-doped methane, explosion overpressure