Abstract: In order to reveal the suppression effect of metal mesh with different parameters on 1,1-diamino-2,2-dinitroethylene (FOX-7) dust explosion, high-speed photography, pressure acquisition system and visual experimental device were used to study the flame propagation characteristics and pressure variation of FOX-7 dust in the presence/absence of metal mesh. The results show that compared with other non-explosive dusts, FOX-7 has faster flame propagation speed and shorter detonation duration. Metal mesh can effectively absorb combustion reaction heat and reduce flame brightness. With the increase of mesh number, the flame propagation height decreases from 62.20 cm to 42.97 cm, the flame propagation velocity decreases from 123.89 m/s to 100.49 m/s, and the maximum explosion pressure decreases from 63.1 kPa to 41.2 kPa. The attenuation rate of explosion pressure of FOX-7 dust ranges from 22.3% to 41.9% with the increase of the number of layers of metal mesh. When the number of layers of metal mesh is 4, the flame in the upper part of the metal mesh completely extinguishes. The results also show that the metal mesh has a certain quenching and pressure-lowering effect, and the inhibition effect increases with the increase of the number of layers and meshes of the metal mesh.

Key words: 1,1-diamino-2,2-dinitroethylene (FOX-7), explosion, metal mesh, mesh number, layer