Abstract: To investigate the influence of different gas?driven water mist sprays on the methane explosion characteristics under sliding devices, 10 cm × 10 cm× 100 cm explosion tests were conducted in a square tube, using high?speed camera technology and pressure acquisition technology. By changing the spring diameter of the sliding device and the type of water mist driving gas, the effects of different working conditions on the evolution behavior of the explosion flame structure and the transient change law of pressure were analyzed. The results show that the synergistic suppression and extinguishing effect of N2 driven water mist and sliding device on methane is better than that of air driven water mist synergistic sliding device, and N2 can play a redundant extinguishing and synergistic effect in preventing the failure of water mist suppression. Compared to the effect of air?driven water mist, N2-driven water mist can effectively shorten the flame combustion time, delay the peak velocity of the flame front, suppress the evolution of the flame front morphology, narrow the pressure oscillation range, attenuate nearly half of the overpressure peak, effectively control the maximum overpressure peak within the combustion zone, and reduce the possibility of secondary explosion hazards in the unburned zone.

Key words: methane explosion, gas drove, fine water mist, sliding device