关键词:

可燃气云, 爆燃, 障碍物, 正冲量, 负冲量

Abstract:

The deflagration experiments were carried out in the 2000 m experimental base to study the enhancement mechanism of deflagration impulse induced by obstacles.Acetylene-air cloud with a 13.3 %(vol) ratio was used as flammable material, which was restricted with 0.02 mm thick polythene film.Positive and negative impulse of deflagration was acquired by means of calculation with pressure recorded by a data-acquisition system whose dynamic responding time was less than 1 ms.Obstacles were composed of plastic binding strip.A series of experiments was completed to research the relations between impulse and obstacle radius, porous ratio and distance from ignition point.The experimental results showed that the deflagration impulse, either positive or negative, was enhanced by obstacles.The deflagration impulse field approximated to cosine curve distribution.The positive and negative impulses increased with increasing barrier radius and with reducing interspaced ratio.

Key words:

可燃气云, 爆燃, 障碍物, 正冲量, 负冲量