关键词:

可燃气云, 爆燃, 爆炸

Abstract: The deflagration experiments were carried out in the 2000m³ experimental base to study the increase mechanism of overpressure wave induced by a semispherical porous barrier. In the center of semispherical acetylene-air clouds with a mixture ratio 7.8% was an ignition electrode that met ISO 6184 “Explosion Protection System" and NFP A68 “Guide For Venting of Deflagrations". The built-in semispherical porous barriers were concentric with the clouds. A data-acquisition system, with dynamic responding time less than 1ms recorded the explosion pressure-time diagrams of deflagrations. It was clear from the simultaneous records of the deflagration process that the flame propagated in sphere initially and became bent and folded at barriers. Meanwhile the burning rate increased. The experimental results showed that the deflagration overpressure increased with the increase of barrier radius and the number of barriers. The deflagration overpressure also increased with the reduction of interspaced ratio.

Key words:

可燃气云, 爆燃, 爆炸