某医院小区室外颗粒物扩散模拟分析

Simulation Analysis of Outdoor Particulate Matters Dispersion in a Hospital District

医院是城市公共建筑,人流量大,对建筑环境要求高。但为了交通便利,医院多建于主干道旁,会受到道路上产生的大量颗粒污染物影响。通过采用FLUENT软件,对衡阳常见风向下某医院小区内的风环境、周边道路扬尘中PM2.5与PM10在医院小区中的浓度分布进行数值模拟,给出医院小区内人呼吸高度的空气流场以及PM2.5与PM10浓度场,并对医院小区建筑布局进行评价。研究表明:小区内无风区与涡流区面积较大,PM2.5与PM10在医院小区中浓度较高,且主要集中在家属楼与休闲区。基于此针对性提出改善医院小区舒适度和减少室外颗粒物浓度的建议。

Hospitals are urban public buildings with a large flow of people and a high requirement for environment. However, for traffic convenience, hospitals are mostly built near main roads, so they’re easily affected by the large amount of particulate pollutants. By using FLUENT software, the wind environment in the hospital district under the common local wind directions and the concentration distribution of PM2.5and PM10 in the dust on the surrounding roads in the hospital district are numerically simulated, thereby presenting the air flow field and the PM2.5 and PM10 concentration field at the height of humans breathing in the hospital district, with the building layout of the hospital district evaluated. The study showed that there are a large windless area and a large vortex area, and the concentration of PM2.5 and PM10 is higher in the hospital district, which are mainly concentrated in the family building and leisure area. The study also proposed recommendations to improve the comfort of the personnel and reduce the outdoor particulate matter concentration in the hospital district. Given this, suggestions are put forward to improve the comfort of the hospital district and reduce the concentration of outdoor particulate matters.