Numerical Simulation of Gas Field in Goaf with Y-type Ventilation System

In order to find out regularity of gas flow field distribution in goaf with Y-type ventilation system and provide theoretical basis for gas control in goaf,gas flow field and gas concentration distribution field in goaf of fully mechanized loangwall with top coal caving with Y-type ventilation system of one air inlet and two air outlets were simulated by CFD software Fluent.The regularity of gas flow and gas concentration distribution field in the goaf was obtained.gas concentration gradually increases along the strike from exploitation front to the deep in goaf,along the slope gas concentration increases from downside to upside.The lowest air dynamic potential point is at the end of roadway retained in the goaf and air leakage flows to the end of roadway retained in the goaf,the problem of gas accumulation in the upper corner can be solved.