通风巷道围岩与空气换热的数值模拟

为有效利用巷道内排除的热空气，以大隆矿区矿井通风巷道为例，采用分离求解方法，对巷道围岩一空气换热系统进行三维数值模拟，分析巷道空气出口平均温度71P、巷道围岩与巷道内空气的平均总传热系数K、巷道空气平均出口热流密度q、风速口的变化规律。结果表明：v在0．2～1．0m／s时，耳较大；v越小，砟越接近于围岩初始温度。v在5．0～7．0m／s内，对K影响不大；当v〈5．0m／s时，K呈线性规律降低。v在0．2～5．0m／s时，q呈二次曲线渐变过程。丁随着”的减小、巷道长度的增加而增加。该结果为进一步研究围岩与空气的换热问题奠定了基础。

Numerical simulation of surrounding rock-to-air heat exchange in ventilating roadway

This paper introduces practices designed for a more effective use of the hot air from road- ways, as is shown by the roadways ventilation of Dalong mine. The practices involve three-dimensional nu- merical simulation of rock-to-air heat transfer with the separation solution method and the analysis of the av- erage temperature of the air outlet Tp, the total average heat transfer coefficient K, the heat flow density of the air outlet q, and the main range of air temperature T in roadways varying with the change of enter wind v. The results show that when v is between 0.2 and 1.0 m/s, the Tp is larger; and the smaller v is, the closer Tp is to the rock temperature. When v is between 5.0 and 7.0 m/s, it has no influence on K. When v is less than 5.0 m/s, it shows a linear laws reduction ; when v is between 0.2 and 5.0 m/s, q is present a gradient of a conic. T with the followers to reduce of v and increases with the length of the roadways. The result serves to lay foundation on further research into heat exchange between rock and air.