矿井通风热阻力数值模拟研究

矿井风流流经井下热水、干热岩、火灾地点等局部高温区域时，风流吸收热量使其内能增加，高温风流在巷道内流动时会产生热阻力。针对如何确定井下风流加热流动时巷道内热阻力的实测范围这一问题，通过理论推导与数值模拟的方法对巷道内热阻力分布情况进行分析。由压力场的模拟结果得出风流加热流动时，所产生的热阻力不仅存在于加热区，高温风流向加热区下风侧流动时热阻力仍然存在。模拟结果表明:对于水平等截面管道，风流流经加热区时，风流速压增加，加热区内风流的静压降幅大于全压降幅；流出加热区的风流向管道出口处流动时，高温风流不断克服阻力做功，并与管道内的新鲜风流、壁面进行热交换，风流温度逐渐下降，当测定区间为加热区入口至模拟管道出口时，风流的静压降幅与全压降幅近似相等。研究结果对井下巷道、隧道及实际工程应用中热阻力的分析与研究都具有重要价值。

Study on numerical simulation of thermal resistance in mine ventilation

When the mine airflow flows through the local high temperature areas such as the underground hot water,dry hot rock and fire location,the airflow absorbs heat which makes its internal energy increase,and the high temperature airflow will produce the thermal resistance when it flows in the roadway.Aiming at the problem of how to determine the measured range of thermal resistance in the roadway when the underground airflow flows with heating,the distribution of thermal resistance in the roadway was analyzed by using the methods of theoretical derivation and numerical simulation.From the simulation results of pressure field,it could be concluded that when the airflow flowed with heating,the generated thermal resistance not only existed in the heating zone,but also existed when the high temperature airflow flowed towards the downwind side of heating zone.The simulation results showed that for the horizontal equal section pipeline,the dynamic pressure of airflow increased when it flowed through the heating zone,and the drop of static pressure of the airflow in the heating zone was greater than the drop of total pressure.When the airflow flowed away from the heating zone and towards the outlet of pipeline,the high temperature airflow continuously overcame the resistance to do work and had the heat exchange with the fresh airflow and wall in the pipeline.Therefore,the temperature of airflow decreased gradually,and when the measured interval was from the inlet of heating zone to the simulated outlet of pipeline,the drop of static pressure of airflow was approximatively equal to the drop of total pressure.The research results are of great value to the analysis and research of thermal resistance in the underground roadways,tunnels and practical engineering application.