掘进工作面冲击射流换热特性

针对高温矿井掘进工作面的通风和换热特点，运用量纲分析法，得出掘进工作面射流冲击换热系数的关联式，结果表明，射流冲击换热无量纲Nu与Re、巷道特征直径D、风筒直径d和风筒出口距工作面断面的距离H有关。采用ANSYS软件对特定巷道的不同风流雷诺数Re、风筒直径d和风筒出口距工作面断面的距离H的216种组合方式下的换热情况进行了模拟。模拟结果回归分析表明：当D/d为5.60时，Nu与Re，H/d之间的关系式符合Lorentzian模型；当D/d为4.20和3.36时，Nu与Re，H/d之间的关系式符合抛物面模型，相关系数R2 分别为0.882 2，0.699 0和0.875 4。

Characteristics of jet flow heat transfer in heading face

According to the characteristics of ventilation and heat transfer at heading face in hot mine，the correlation of heat transfer coefficient for jet flow in heading face was formulated using dimensional analysis method.The results show that the heat transfer dimensionless number Nu of jet flow in heading face has relationship with dimensionless number Re，air duct diameter d and the distance H between air duct outlet and heading face.The heat transfer conditions under 216 combinations were simulated with ANSYS software.The regression analysis of numerical simulation results shows that when D/d is 5.6，the relationship between Nu and Re，H/d could be expressed by Lorentzian model.When D/d is 4.20 and 3.36，the relationship between Nu and Re，H/d could be expressed by paraboloid models.The correlation coefficients R2 are 0.882 2，0.699 0 and 0.875 4 respectively.