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为科学预测高温掘进工作面气候条件,制定合理降温措施,需对工作面围岩温度场进行研究.根据掘进工作面不断移动的特点,建立动坐标下的围岩温度场数学模型,并实现无因次化;利用有限体积法对模型进行离散,并编制解算程序.以无因次长度为25的掘进工作面为例,解算得到毕渥数Bi和贝克莱数Pe均为1时其围岩无因次温度分布,以及不同条件下迎头周边巷道的不稳定换热准数分布;通过大量计算,得到不同毕渥数时不稳定换热准数随贝克莱数增大的变化曲线.研究结果表明:不稳定换热准数随毕渥数、贝克莱数的增大而增大.通过查图即可确定围岩与风流间的不稳定换热准数,从而为工作面的风温预测和需冷量计算提供基础参数.
In order to scientifically predict the climatic conditions of high-temperature heading face and to develop reasonable cooling measures, the temperature field of the surrounding rock of the face must be studied.A mathematical model of temperature field of surrounding rock under dynamic coordinates is established according to the characteristics of continuous moving of heading face, The finite volume method is used to discretize the model and the program is compiled.With the excavation face without dimensionless length 25 as an example, when the Bi-value Bi and the Berkeley number Pe are both 1 The dimensionless temperature distribution of the surrounding rock and the unstable heat transfer standard distribution of the roadway around the heading head under different conditions are obtained. Through a large number of calculations, the change curves of the unstable heat transfer standard number with the Berkeley number at different Biogowes number are obtained. The results show that the quasi-unstable heat transfer number increases with the increase of the Bourdon number and Berkeley number, and the unstable heat exchange standard between the surrounding rock and the wind flow can be determined by the check chart, Temperature prediction and calculation of cooling capacity provide basic parameters.