采空区流场及氧浓度场模型分析及数值模拟研究  

Model Analysis and Numerical Simulation of Flow Field and Oxygen Concentration Field in Gob

作　　者：张杉 秦跃平[1] 刘伟[1] 高鹏 ZHANG Shan;QIN Yue-ping;LIU Wei;GAO Peng(College of Resource and Safety Engineering, China University of Mining and Technology, Beijing 100083 , Beijing, China)

机构地区：[1]中国矿业大学(北京)资源与安全工程学院

出　　处：《煤炭工程》2019年第7期104-108,共5页Coal Engineering

摘　　要：采空区自然发火是多场耦合作用的复杂过程,研究流场及氧浓度场模型是进行采空区高温预测预报的前提。首先建立了动坐标下流场及氧浓度场的数学模型,然后研究了模型的无因次形式,并定义了无因次压力、无因次速度、无因次氧扩散系数、无因次耗氧速度系数等无因次准则。通过分析可得,遗煤厚度是采空区氧浓度场的重要影响因素。最后通过数值模拟得到不同遗煤厚度下氧浓度场的分布图,进而得出随着遗煤厚度减小氧气在采空区的分布更广的结论。Spontaneous combustion in gob is a complex process and studying on the variation and influence factors of airflow field and oxygen concentration field is the prerequisite to forecast high temperature in gob. Firstly, the mathematical model of flow field and oxygen concentration field under moving coordinates is established, and then the dimensionless form of the model is studied. At the same time dimensionless criteria such as dimensionless pressure, dimensionless velocity, dimensionless oxygen diffusion coefficient, and dimensionless oxygen consumption velocity coefficient are defined. Through analysis, residual coal thickness is an important factor of spontaneous combustion in gob. Finally, the distribution map of the oxygen concentration field under different thickness of the residual coal is obtained by numerical simulation, which shows that the distribution of oxygen in the gobbecomes wider as the residual coal thickness decreases.

关 键 词：采空区 自然发火 无因次分析 数值模拟 

分 类 号：TD75[矿业工程—矿井通风与安全]