空冷岛对周围大气流场影响数值模拟

Numerical simulation on influence of air-cooling island on the atmosphere flow field

空冷岛的布置会对周围大气流场产生影响,使边界层内参数发生变化。本文使用Gambit软件建立了空冷岛模型,为使模拟结果与实际情况更接近,通过自定义程序(UDF)加载大气边界层函数,并针对不同的温度层结,设置了不同的温度分布函数,最后应用Fluent软件对空冷岛对局地环境的影响进行了模拟分析。结果表明:在空冷岛下游流场区域,由于空冷岛及其周边建筑物的阻碍作用,风速明显减小,而稳定层结对这种影响具有抑制作用,随着向下游流场的延伸,对速度的影响逐渐减弱;空冷岛的热排放使周围的气体混合更加剧烈,湍动能在竖直方向上发生剧烈变化;空冷岛对温度的影响范围主要集中在100m高度以下,随着高度的增加,这种影响逐渐减弱。

The existence of air-cooling island will affect the surrounding flow field and influence parameters of the boundary layer. The Gambit software was employed to build the air-cooling island model. To make the simulation results be closer to the actual situation,the velocity and temperature distribution function of the boundary layer was loaded by the UDF as the inlet boundary condition. The Fluent software was used to simulate the influence of air-cooling island on the environment air. The results indicate that, the effects of blocking of the air-cooling island and building make the air velocity reduce obviously. Hot air from the air-cooling island make the surrounding air mixture becomes more intense. The turbulent kinetic energy also changes in the vertical direction. The effect of air-cooling island on the air temperature is mainly under 100 m height,and this effect gets weaker with the increasing height.