屋顶导流结构对城市街谷内污染物扩散的影响

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中图分类号：X51；X169 文献标志码：A

Influence of roof wind-catcher structures on pollutant dispersion within urban street canyons

HE Lai，CUI Pengyi，HUANG Yuandong，LUO Yang，LI Zhongzheng，SHI Chengkai （SchoolofEnvironmentandArchitecture，UniversityofShanghaiforScienceandTechnology，Shanghai 2oo93，China）

Abstract： To explore the influence of different roof shapes with wind catchers on airflow and polutant dispersion in street canyons， five canyon configurations with distinct roof structures and four types of wind-catcher deflectors were examined. A computational fluid dynamics （CFD） model， validated through wind-tunnel experiments， was used to simulate flow pattrns and pollutant transport inside the canyons. The results show that the installation of wind-catchers significantly enhances the average ventilation capacity in canyons with double-flat， double-triangular， and double-up-wedge roofs， while its effect remains limited in canyons with double-down-wedge roofs. The various wind catchers，however， exert distinct influences on street canyon with doubletrapezoidal roofs. Increasing the angle， parallel spacing， or length， as well as reducing the width of wind catchers， the ventilation capacity and polutant dilution in street canyons can be improved significantly， thereby the local air quality can be accurately regulated.

Keywords： roof shape; wind catcher; street canyon； pollutant dispersion； numerical simulation

街道峡谷（简称街谷）是城市典型的建筑结构。（剩余11827字）