Abstract: For the sake of exploring the explosion suppression efficiency of aluminum-magnesium alloy-based foam composite, explosion suppression experiments were conducted by using an explosion chamber with 80 mm×80 mm in cross-section, and 900 mm in length. The influences of the filling density on the flame propagation speed, pressure and flame front morphology were observed. The results show that when the filling density is 10 kg/m³, flame propagation is weakly enhanced by aluminum-magnesium,that when the filling density exceeds 20 kg/m³, the effect of this material on flame propagation is transformed into suppression, that the time for the flame propagation velocity to reach the first peak and that for the explosion pressure to reach the rupture pressure are further extended with the increase of filling density, that when the filling density is 40 kg/m³, the explosive flame propagation is completely suppressed. Affected by the filling material, the flame front morphology changes from laminar flame to turbulent "hourglass" flame after passing through the filling area. The mechanism of explosion suppression of the material is mainly reflected in both turbulence promotion and cooling inhibition.

Key words: porous structure, aluminum-magnesium alloy, methane-air mixtures, flame propagation, explosion suppression