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根据紊流传质理论建立了瓦斯浓度的纵向弥散模型及矿井通风系统的一维非稳定流动网络模型．根据该模型可以计算出可控循环通风系统内部任意位置、任意时刻的风量和瓦斯浓度值．应用该模型，对包含多个工作面的可控循环通风系统的各种非稳态现象进行了模拟分析，得出了瓦斯弥散作用对循环区瓦斯浓度的影响以及循环风机开启、关闭，风门关闭，瓦斯的非正常涌出等非稳态现象下循环区各分支瓦斯浓度的变化规律，为制定非稳态循环风系统的安全保障措施奠定了基础．
According to the theory of turbulent mass transfer, a longitudinal dispersion model of gas concentration and a one-dimensional unsteady flow network model of mine ventilation system are established. According to the model, the air volume and gas concentration can be calculated at any position within the controllable circulation ventilation system at any time. The model is applied to simulate various unsteady phenomena of the controllable circulation ventilation system with multiple working faces. The influence of gas dispersion on the gas concentration in the circulation zone is obtained and the circulation fan is turned on and off and the damper is closed , Non-steady gas emission and other non-steady-state phenomena in the circulation area of the gas concentration changes, laid the foundation for the development of unsafe circulation air system security measures.