围岩散热计算及壁面水分蒸发的处理

Treatment of Water Evaporation on Airway Surface in Calculation of Strata Rock Heat

笔者采用湿度系数法对壁面水分蒸发进行了处理,对计算壁面处饱和空气含湿量的方法进行了改进,将饱和空气含湿量与温度的关系拟合为二次曲线;建立了在考虑壁面水分蒸发情况下解算巷道围岩温度场分布及围岩向风流的散热量的数学方程,并采用异步长有限差分法对其进行了数值模拟求解;解算出巷道壁面水分蒸发情况下围岩温度分布、壁面温度和围岩散热量的变化规律;并与将饱和空气含湿量与温度的关系拟合为线型关系曲线时的解算结果进行了对比,将饱和空气含湿量和温度之间的关系拟合为线性的计算结果存在一定的误差,通风时间越长,湿度系数越大,风流相对湿度越小,拟合为线性时计算出来的壁面温度和围岩散热量的误差越大。

Wemess factor was adopted to deal with the water evaporation on airway surface. The method for determining the rmismre content of air on airway surface was improved and the relationship between saturated moisture content of air and temprature was fitted into a quadratic curve. A mathematical model simulating the temperature distribution of the surrounding rock and strata heat release was established taking the water evaporation on the airway surface into consideration. Finite difference method was adopted to obtain numerical solutions. The pattem of temperature distribution of surrounding rock, airway surface temperature and strata heat release was revealed. The solutions were contrasted with that obtained when the relationship between saturated rmismre content of air and temperature fitted into a linear curve. The linear curve model will cause quite big error in simulation of airway surface temperamre and strata heat release. The error increases with the ventilation time and wemess factor of the airway surface, and decreases with the increase of airflow humidity.