气溶胶污染物跨楼层传播特性数值研究——建筑热羽流影响
Numerical study on the cross-floor transmission characteristics of aerosol pollutants:effect of building thermal plume
赵青霞 1尹雪健 1陈一 1刘畅 1崔鹏义1
作者信息
- 1. 上海理工大学环境与建筑学院,上海 200093
- 折叠
摘要
太阳辐射力和水平来流惯性力引起的壁面热羽流会对建筑表面的污染物跨楼层扩散传播产生明显影响.采用风洞实验和数值模拟,研究 6 层居民建筑在不同强度热羽流影响下,气溶胶污染物沿建筑立面不同楼层扩散分布特性.采用理查德森数Ri表示建筑立面热羽流的强弱.研究表明,建筑立面的热羽流对气溶胶污染物的扩散分布有明显影响.当Ri＜2.28 时,污染物主要向迎风面近地面聚集,导致近地面污染物浓度较高;当Ri≥2.28 时,污染物向高处扩散,将引起严重的污染物跨楼层扩散传播风险.
Abstract
The building wall thermal plume causing by solar irradiation and horizontal inertial force can significantly affect the diffusion and cross-floor transmission of pollutants along the building vertical surface.In this study,the wind-tunnel experiments and numerical simulation were used to investigate the effect of thermal plume intensity on cross-floor transmission characteristics of aerosol pollutants along the building facades in a 6-story residential building.Richardson number(Ri)is used to assess the thermal plume intensity along the building facades.The study shows that the thermal plume on the building facades has a great influence on the diffusion of aerosol pollutants.When Ri＜2.28,pollutants mainly accumulate near the ground on the windward surface,leading to higher pollutants concentration near the ground.When Ri≥2.28,pollutants diffuse to higher levels,causing serious risks of cross-floor pollutants dispersion.
关键词
建筑热羽流/污染物扩散/跨楼层传播/风洞实验/数值模拟Key words
building thermal plume/pollutants dispersion/cross-floor transmission/wind tunnel experiment/numerical simulation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据