地道风系统地埋管管径对出口空气温度的影响研究

Effect of pipe diameter on outlet air temperature in tunnel air system

构建了空气与地道壁面换热理论模型,用于计算地埋管出口空气温度,通过正交模拟分析了地埋管管径、长度以及进口风速对地埋管出口空气温度的影响,并与数值模拟结果进行对比。结果表明:地埋管管径极差值最大,可达20.4 m,是地埋管出口空气温度的主要影响因素,地埋管长度和进口风速为次要因素;随着管径的增大,出口空气温度随之升高;当管径为0.2 m时,出口空气温度降幅最大,管径大于0.6 m后,降幅逐渐减小,基本趋于稳定值,因此应控制管径在0.2~0.6 m。

The theoretical model of heat transfer between air and tunnel wall was established to calculate the air temperature at the outlet of buried pipe, and the effects of pipe diameter, length and inlet wind speed on the air temperature at the outlet of buried pipe were analyzed through orthogonal simulation. The results showed that the maximum difference of buried pipe diameter is 20.4 m, which is the main factor influencing the air temperature at the outlet of buried pipe, while the length of buried pipe and the wind speed at the inlet are the secondary factors. As the pipe diameter increases, the air temperature at the outlet increases. When the pipe diameter is 0.2 m, the air temperature at the outlet decreases the most. When the pipe diameter is greater than 0.6 m, the decline gradually decreases and basically tends to be stable. So the diameter should be in the scope of 0.2-0.6 m.