基于道路布局的城市区域热环境数值模拟研究

Numerical Simulation Study of Urban Thermal Environment Based on the Road Layout

对整个长沙市城区建筑及道路进行建模,并采用CFD软件Fluent对长沙市区域热环境进行模拟分析,结合红外线温度图对比验证.研究结果表明:绿地、水体覆盖面积对缓解城市热岛效应、改善城市空气质量有很大的作用;城市道路布局与城市区域热环境有很大的关联,城市道路的合理设计和布局可以很好地利用城市主导风进行自然通风;高层建筑布局与道路走向设计应当相契合,前后、高低错落布置,减少大面宽建筑,充分利用城市道路通风改善城市区域热环境.

The simulation and analysis of the Changsha urban thermal environment and the analysis of the infrared temperature map of Changsha urban area were presented. The results have shown that green land and water coverage have significant effects on alleviating the urban heat island effect and improving urban air quality. The results have also shown that the road layout of the city is really relevant to urban regional thermal environment, and the rational design of urban road layout may take the advantage of the prevailing wind for natural ventilation, and the layout of high-rise buildings should be coincident with the urban road direction to utilize the urban roads ventilation to improve the thermal environment.