Computational fluid dynamics simulation on the longwall gob breathing

作     者：Samuel A.Lolon Jürgen F.Brune Gregory E.Bogin Jr. John W.Grubb Saqib A.Saki Aditya Juganda 

作者机构：Department of Mining EngineeringColorado School of MinesCO 80401USA Department of Mechanical Engineering Colorado School of MinesCO 80401USA 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2017年第27卷第2期

页      面：185-189页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 0808[工学-电气工程] 081903[工学-安全技术及工程] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：the financial support of the National Institute for Occupational Safety and Health–United States(No.211-2014-60050) 

主　　题：计算流体力学模拟 采空区 呼吸 爆炸性气体 计算流体动力学 大气压力 长壁开采 压力平衡 

摘      要：In longwall mines, atmospheric pressure fluctuations can disturb the pressure balance between the gob and the ventilated working area, resulting in a phenomenon known as ‘‘gob breathing. Gob breathing triggers gas flows across the gob and the working areas and may result in a condition where an oxygen deficient mixture or a methane accumulation in the gob flows into the face area. Computational Fluid Dynamics(CFDs) modeling was carried out to analyze this phenomenon and its impact on the development of an explosive mixture in a bleeder-ventilated panel scheme. Simulation results indicate that the outgassing and ingassing across the gob and the formation of Explosive Gas Zones(EGZs) are directly affected by atmospheric pressure changes. In the location where methane zones interface with mine air, EGZ fringes may form along the face and in the bleeder entries. These findings help assess the methane ignition and explosion risks associated with fluctuating atmospheric pressures.