不同裂隙对煤层热流耦合现象的影响

煤炭在构造应力的作用下会产生不同形状的裂隙，不同的裂隙会对煤层内的流动与传热产生影响。以阜新市高德煤矿为例，建立二维物理模型，采用两区域方法构造控制方程组，运用计算机软件对四种裂隙下煤层的流场和温度场进行数值计算。计算结果表明:不同裂隙对煤层流场的影响主要在空气流动侧，对煤层区域影响很小；不同裂隙对煤层温度场的影响主要在裂隙界面上，对外界空气和煤层内部的影响均很小；不同裂隙条件下煤层壁面平均努谢尔特数曲线的契合度随着瑞利数的增加而不断降低，相比标准界面，其他三种界面的煤层壁面平均努谢尔特数值基本一致。研究结果可为煤矿的安全开采提供理论性指导。

Effect of different cracks on thermal flow coupling in coal seam

Under the effect of tectonic stress, the cracks with different shapes will appear in coal, and different cracks will affect the flow and heat transfer in the coal seam. Taking Gaode coal mine in Fuxin city as example, a two-dimensional physical model was established, and the two area method was used to construct the governing equations group. The flow field and temperature field of coal seam under four kinds of cracks were calculated by the computer software. The results showed that the effect of different cracks on the flow field in coal seam is mainly in air flow area, with very little effect on coal seam area. The influence of different cracks on the temperature field in coal seam is mainly on the crack interface, with little influence on external air and inside of coal seam. The coordination degree of the average Nusselt number curve of coal seam wall under different cracks conditions decreases with the increase of the Rayleigh number, and compared to the standard interface, the average Nusselt number of coal seam wall for other three kinds of interface are basically the same. The research results can provide theoretical guidance for safe mining of coal mine.