主动隔热巷道隔热层热物性参数对隔热效果的影响

Thermal Insulation Performance Affected by Thermal Physical Parameters of Thermal Insulation Layer in Active Thermal Insulation Tunnel

为得到主动隔热巷道隔热层热物性参数对隔热效果的影响规律,建立了主动隔热巷道风流与围岩的气—固耦合传热模型。选取8种建筑保温材料的热物性参数进行数值模拟,结果表明:不论巷道是否构建有隔热层,巷道围岩的散热量都与通风时间呈正幂指数关系;巷道构建隔热层后,减少的围岩散热量与隔热层的导热系数呈负幂指数关系,同一地点的风流温度降低值与隔热层的导热系数呈负指数关系。隔热层导热系数是影响其隔热效果的主要因素,隔热层的导热系数越小,隔热效果越明显。

In order to obtain the influence law of thermal property parameters of thermal insulation layer on thermal insulation effect of active thermal insulation roadway,a gas-solid coupling heat transfer model of airflow and surrounding rock in active thermal insulation roadway was established.The thermophysical parameters of 8 materials for building thermal insulation were selected for numerical simulation.The results show that the heat dissipation of roadway surrounding rock has a positive exponential relationship with ventilation time,regardless of whether the roadway is constructed with thermal insulation layer or not;after the thermal insulation layer is constructed in the roadway,there is a negative power exponential relationship between the heat loss of the reduced surrounding rock and the thermal conductivity of the thermal insulation layer,the decreasing value of airflow temperature at the same location has a negative exponential relationship with the thermal conductivity of the thermal insulation layer.Coefficient of heat conduction of thermal insulation layer is the main factor that affects its heat insulation effect,and the smaller the thermal conductivity of the thermal insulation layer,the more obvious the thermal insulation effect.