巷道瓦斯爆炸二次反冲的数值模拟

通过建立瓦斯爆炸流场的数学模型，运用ＴＶＤ（ｔｏｔａｌ ｖａｒｉａｔｉｏｎ ｄｉｍｉｎｉｓｈｉｎｇ）格式的有限差分方法，模拟了瓦斯爆炸冲击波峰值超压沿井巷的衰减规律，着重反映了冲击波二次反冲过程，其结果对于实际防爆工程设计具有指导意义。

Numerical simulation of the returm shock of gas explosion along the underground workings

A mathmatical model of the flow field of gas explosion is established. Applying themodified TVD (total variation diminishing) scheme of finite difference, simulation is conducted ofthe attenuation law of peak waves along underground workings, a law which best describes re-turn shocks and hence the acyual process of explosion . From the result, gas explosion and es-pecially return shock in mine can be understood clearly. The shock is formed at the source ofgas explosion with the value of peak shock decreasing with time and then return shock pro-duces at the negative pressure area. With the strength of return shock larger than normal pres-sure, the pressure of air in the undergound workings tends to become stabilized after the returnshock. The pressure of peak shock and return shock also decrease with increase of distanceand finally it approachs to normal pressure of the air. The attenuation rate of peak shock fol-lowr the law that it decreases along the workings. Because the destruction of mine vehicles dueto return shock is on the base of first shock, the design of mine ventilation system should takenotice of that and make some measures to prevent further loss.