Experimental Study on Influence of Open/closed-end Conduit on Gas Explosion Transmission Characteristic

摘要

Most of the gas explosion accidents environment under well can be regarded as the conduit system with igniting side closed. The influence of open/closed-end conduit on gas explosion transmission characteristic in different work conditions were studied, such as installing coil in ignite side, sticking heat-insulated materials in ignite side, etc. The experimental conduit is rectangular in cross section, measuring 80mmx8Omm in width. The research result shows that when the gas explosion, the influence of open/closed-end conduit on flame propagation and explosion wave intensity in gas explosion initial stage is relatively little. After that, the flame acceleration degree, the acceleration range, the flame propagation velocity maximum, the explosion wave intensity (overpressure, wave velocity) in open-end conduit is greater than those in closed-end conduit, the reason is that flame propagation suppressed by reflected wave (shock wave) at the back part.