口袋公园内有无植物影响行人风环境的评估  

Assessment on Pedestrian-level Wind Around a Pocket Park with and Without Vegetation Inside Street Canyons

作　　者：钟佳定 刘建麟[1] 许月丽 汪俊松[2] ZHONG Jia-ding;LIU Jian-lin;XU Yue-li;WANG Jun-song(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China;State Key Lab of Subtropical Building Science,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]华南理工大学亚热带建筑科学国家重点实验室,广州510641

出　　处：《建筑节能（中英文）》2021年第12期132-138,共7页Building Energy Efficiency

基　　金：国家自然科学基金资助项目(52008079)。

摘　　要：营造良好的局地微气候能缓解城市热岛及城市通风不畅。新冠肺炎疫情期间,市民跨城跨区活动受限,多在住区旁的开放/半开放区域活动,也给定量探究局地行人微气候的新特点带来难度。采用雷诺时均方法中RNG k-ε模型对夏热冬冷气候下某典型街谷中有无口袋公园进行风环境模拟分析,并探究了口袋公园中有无植物的影响。结果表明,所用的湍流模型、初边条件及数值方法得到的结果与选取的验证实验结果吻合度高,满足口袋公园风环境模拟需求。仅在口袋公园的作用下,行人区无量纲风速相对于无公园时差异可达0.5。当附加公园内植物时,周围街谷行人区平均风速受植物影响较小,仅在公园核心区内无量纲风速降低了0.1。整体而言,街谷中口袋公园对行人区低风速有明显的改善作用,研究成果可为疫期低碳宜居街区设计及微气候模拟提供参考。Ideal urban microclimate can contribute to the mitigation of urban heat island effect and the improvement of urban ventilation. Cross-district activities are restricted so that citizens have to turn to use open or semi-open spaces in their neighborhoods during the pandemic. The emerging new normal of urban living brings new challenges to urban microclimate studies, especially those focusing on the pedestrian-level. This study applies the RANS approach with RNG k-ε model to investigate the wind environment around a typical street canyon in a city with hot summer and cold winter. The influences of pocket park with and without vegetation in the street canyon are also assessed. Results indicate that the turbulence model, the initial and the boundary conditions, and the numerical methods applied in this study can make predictions that correlate well with benchmark experiments, thus they are able to satisfy the needs of simulating wind environment around the pocket park inside street canyon. Under the influence of pocket park alone, the normalized wind speed at the pedestrian-level amplifies by 0.5. After adding the vegetation to the park, the wind speed amplification is still evident for the street canyon. However, the influence of vegetation is weak, only reducing the normalized wind speed by 0.1 in the center area of the pocket park. Overall, the pocket park inside street canyon has evident amplification effect on the low wind condition at the pedestrian-level. Research findings can guide low-carbon street district designs and the microclimate simulations.

关 键 词：城市通风 口袋公园 植物 CFD模拟 行人风环境 

分 类 号：TU11[建筑科学—建筑理论]