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用迎风有限元法求解了采空区气体渗流方程和氧气的渗流 消耗 弥散方程,用图象显示了注氮时采空区的流态、氧浓度分布变化的流体力学过程和注氮防灭火机理.注氮气能改变采空区的漏风流态,并以氮气等量抑制工作面向采空区的漏风,减少了向采空区的供氧.在采空区的入风隅角处顺流注氮,有利于氮气沿漏风流势移动.注氮流量与氧的惰化浓度线位置近似呈反比例关系.给出用数值模拟确定注氮流量的方法.图7,参8.
The seepage finite element method is used to solve the seepage equation and seepage dissipation equation of oxygen in the goaf, and the images show the fluid mechanics and the mechanism of nitrogen injection in the goaf Note Nitrogen gas can change the flow pattern of air leakage in the goaf and suppress the air leakage to the goaf with the same amount of nitrogen gas and reduce the oxygen supply to the goaf. Nitrogen is conducive to the movement of nitrogen along the leaking air flow.Nitrogen injection flow and oxygen inerting concentration line position is approximately inversely proportional relationship.Numerical simulation to determine the flow of nitrogen injection method.Figure 7,