掘进巷道风流热环境的数值模拟

Numerical simulation of the thermal environment at working face of diving airway

用三维k-ε紊流模型模拟了压入式局部通风掘进工作面风流与巷道围岩的热交换过程以及巷道壁面水分和风流之间的热湿交换.得出掘进工作面风流温度和湿度的分布是相似的,阐明了从工作面壁面散发显热和潜热随时间的变化规律及其与湿度系数的关系,即湿度系数越大,潜热热流密度越大,显热热流密度越小,总热流密度随湿度系数的增大而增加.分析了掘进巷道周围岩石的温度分布和变化规律,壁面换热系数分布不均匀对壁面附近岩石温度分布有很大影响,随着向围岩内部的深入,围岩温度趋于均匀分布.

The 3-dimensional k -ε turbulent flow model was used to simulate heat-and mass-transfer in a heading face with forcing auxiliary ventilation system. The distributions of air temperature is similar to that of moisture content in the locally ventilated working face, and the variations in sensible heat and latent heat from the surface of the roadway into the working face with time and wetness factors were analyzed, with the increase of wetness factor, latent heat flux increases, sensible heat flux decreases, and the total heat flux increases. The temperature distribution in the strata rock and its variation with the elapsed time at different wetness factors were discussed, The nonuniform distribution of heat transfer coefficient on rock surface has a large effect on the rock temperature distribution near airway surface. As the location goes deeper into the surrounding strata from the roadway surface, the unever distribution effect of rock temperature diminishes and approaches an even distribution gradually.