Influence of Gas Accumulation Scope on Destroying Characteristics and Propagation Laws of Gas Explosion Pressure Waves in a Blind Tunnel
CHENG Fangming
DENG Jun
CAI Zhouquan
LUO Zhenmin
XIAO Yang
Abstract：In order to study the gas explosion characteristics in its accumulation zones with different length in a coal mine blind tunnel, numerical simulations were carried out by using computational fluid dynamics software FLACS, comparison were made on the parameters such as the explosion overpressures and positive impulses and their distribution in the tunnel, analysis was conducted on influence laws of the gas accumulation scope upon the destroying characteristics of the explosion pressure waves, and studies were made on the characteristics of the interactions between the explosion pressure wave and flame in the gas accumulation zones with different length in the blind tunnel. The study results showed that with the increase of the gas accumulation scope in the blind tunnel, the destroying characteristics of the explosion pressure waves might suddenly change, the maximum explosion pressures increased stepwise, and when the gas accumulation scope exceeded a certain critical value, the location where the maximum explosion pressures appears moved from the closed end to the open end of the tunnel; the maximum explosion impulses first increased monotonously and then tended to stabilize, and the location of the maximum explosion impulses was always in the closed end of the tunnel;the acceleration of the flame caused by the back rarefaction wave was the main reason led to the sudden increase of the explosion overpressure near the open end of the tunnel.
Keywords：blind tunnelgas explosionexplosion overpressureexplosion impulseFLACS
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 1-5,9 )