The Test Research Of Different Ratio Of The Main And Auxiliary Air Volume In The U+L Ventilation Mode

Based on the basic situation of Shi Jiazhuang mine15108working face, on the basis of the thorough analysis, according to the principle of the "U+L" two intakes and one return ventilation system, fluid mechanics models are established. Application of computational fluid dynamics simulation technique, explore the law of goaf leakage field in "U+L" two intakes and one return ventilation system. Comparison and analysis the relationship between the different ratio of the main and auxiliary air volume and the influence of the characteristics of goaf flow field and gas migration. Studies have shown that in "U+L" two intakes and one return ventilation system, when the the main and auxiliary air volume ratio is3:1, can significantly reduce the concentrated air leakage at the upper corner, which can effectively alleviate the problem of gas accumulation in return air lane and at the upper corner. This research can give the help for harmful gas governance and provide theoretical basis for the optimization of ratio of the main and auxiliary air volume.This paper involves the research main content is to revolve around the following aspects. To study Shi Jiazhuang mine15108working face the related field measurement and data collection have been carried on. Analyzed the geological condition of15108working face, according to the theory of rock mechanics related to goaf, the mined-out area is divided into three zones and identify each area and interface of the porosity and permeability. Through the analysis of the measured data and relevant information to calculate the working face and goaf gas emission of each area, imports of wind speed and discharge pressure and relevant parameters of roadway. According to the basic parameters of working face and the results of the analysis of working face and necessary simplification, establish a complete mathematical model. Application of computational fluid dynamics simulation software to research the law of goaf air leakage analysis under the condition of different ventilation leakage wind flow field of the similarities and differences, abstract affect the universal law of gas leakage at the field of the goaf.