针对矿井通风入口风流季节性差别大的现象,对不同季节通风巷道风流温变规律进行现场测试,建立巷道围岩-风流换热的数学物理模型,数值模拟通风风流与围岩的换热特性。研究结果表明,风流在煤巷中流动过程中不断与围岩进行热交换,进而导致风流温度不断升高,但在工作面段风流升温缓慢,数值计算结果与实测结果相吻合。不同季节通风巷道内风流升温效果差别明显,入口风流温度越低,风流在巷道内流动相同距离时,温度越低,但温升越大。
There exists large seasonal difference in entrance airflow temperature in mine ventilation. This paper tested temperature variation in roadway ventilation in different seasons, and established a mathematical heat transfer model of the surrounding rock and airflow to numerically simulate their heat transfer characteristics. The results show that the airflow exchanges heat with the surrounding rock along its path in the roadway, leading to continuous increase of the airflow temperature, which increases slowly in the working face. The numerical simulation results are consistent with the measured results. The variation of airflow temperature is significantly affected by seasonal difference, and the lower the airflow temperature at the entrance is, the larger the temperature change is under the same airflow distance in the roadway. This study reveals the heat transfer characteristics of mine ventilation and may provide references for ventilation cooling technologies.
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