| In this thesis, the author discusses in more detail the character of Y-type ventilation system with two inlets and one return, and simulates the law of gas flow and the distribution of gas concentration in full-mechanized mining working face based on data about 1115(1) full-mechanized mining working face of Huai Nan Guqiao coal mine. The author contrasted the result of simulation with metrical data , and in-depth analysis the law of emission gas which from gob .At first, the author summarizes the law and the theory about the flow of gas from gob based on literature. Secondly, the author summarizes the technic about gas harnessing. In the next, the author studies the theory about porous medium and seepage. In order to meet the precision of parameter when simulating by computer, the author studies porosity and resistance of air leakage, and then establishes the mathematical model, programs User-Defined Function. The author simulates the situation of air flow field in gob area and gas field by using FLUENT (CFD software). The law about the situation of air flow field in gob and gas field is concluded by simulating. The author gathers lots of metrical dats. The result of simulation is proved correctness by comparing.To sum up, the author analyse the in more detail the character of some ventilation manner. It is proved that Y-type ventilation system with two inlets and one return is very good for gas harnessing.
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