摘要
为了改善咸阳市主城区的通风环境,应用CFD技术对该城区的风热环境进行了预测和分析,建立了风热场三维数值计算模型,仿真得到了该城区风热环境现状,探讨了来流风速、冷热条件等对该城区通风的影响。从对该城区的整场分析来看,常年平均风速2.4 m/s的东北风可以穿过整个城区,使城市通风良好;而风速为0.5 m/s的东北风,会使城市通风不佳;在夏季热工况下,由于受到沿建筑向上的热羽流影响,增加了城区内气流的湍动性,并会有气流向上排出人们的活动区,如果来流风速小则该现象会更加明显;大、小2种风速条件下,城区温度均高于城市周边区域,在小来流风速条件下,城区温度会相对更高。该研究旨在为该城市规划通风廊道提供帮助。
To improve the ventilation environment in the main urban area of Xianyang City,computational fluid dynamics(CFD)technology was applied to predict and analyze the wind and thermal environment.A 3D numerical model of the wind-thermal field was established to assess the current wind and thermal environment.The effects of inflow wind speed and thermal conditions on the urban ventilation were discussed.From the overall analysis,the prevailing northeast wind with an average annual speed of 2.4 m/s can penetrate the entire city,resulting in good ventilation;However,a northeast wind with a speed of 0.5 m/s causes poor ventilation.Under the thermal conditions in summer,affected by the thermal plumes rising along the buildings,the turbulence of the airflows within the urban area is increased.Moreover,airflows rise upward out of the people’s activity areas.This phenomenon is more pronounced with low inflow wind speed;Under both high and low wind speed conditions,the temperature within the urban area is higher than that of the surrounding regions.The temperature in the urban area is relatively higher under low inflow wind speed conditions.This study aims to provide assistance for the planning of ventilation corridors in Xianyang city.
作者
张宇昊
殷元生
Zhang Yuhao;Yin Yuansheng(The IT Electronics Eleventh Design&Research Institute Scientific and Technological Engineering Corporation Limited Xi’an Branch,Xi’an 710100,China;Chang’an University,Xi’an 710064,China;China Northwest Architectural Design and Research Institute Co.,Ltd.,Xi’an 710018,China)
出处
《市政技术》
2025年第3期279-287,共9页
Journal of Municipal Technology
关键词
城市通风
数值仿真
来流风速
热羽流
风热环境
urban ventilation
numerical simulation
incoming wind speed
thermal plume
wind and thermal environment
