The Influence of the Vent Area Location on Hydrogen-Air Mixture Deflagration in Large-Scale Vessel

Abstract

The results of large-scale experiments on combustion of local hydrogen-air mixtures in a chamber of 20 nr' volume are presented. It has been shown that, for mixtures with a relatively high laminar burning velocity, containing 30 % (vol.) hydrogen in air, the explosion pressure and the explosion pressure rise rate decrease more rapidly in the case where the vent area is located in the vicinity of a local combustion mixture. For mixtures with a relatively low laminar burning velocity, containing 10% (vol.) hydrogen in air, the more rapid reduction of an explosion pressure was observed at the location of a vent area far from a local combustible mixture. The mutual influence of repeated obstacles and gasdynamic disturbances, caused by a gaseous mixture motion to a vent area, on the intensification of the local mixtures combustion has been investigated.

Large Eddy Simulation of Gasoline-Air Mixture Explosion in Long Duct with Branch Structure

“…It is found that the space structure and shape have great influence on the law of explosion especially in the overpressure time history and flame propagation. The differences between the space structure and the shape contain the L/D ratio [2], vent size or location [3][4][5], obstacle shape or number [6][7][8], and turnings or bends [9,10]. Especially for the turnings or bends, researchers have made some findings and discoveries.…”