摘要
采用二维低Re数κ-ε模型和被动标量的湍流扩散方程,对双车道街道峡谷内的流场和气态污染物浓度场进行了研究.并应用风洞实验数据对模拟进行了验证,分析流场和浓度场的模拟结果表明,3种不同排放情况下,流场分布相同,且相同高度下,上风向污染物浓度均高于下风污染物浓度.由于流场导致浓度梯度分布的差异,相对于上风向车道情况,下风向车道上排放的污染物更易于向街道峡谷外扩散.
The flow field and gaseous pollutant concentration field of double-lane street canyon were studied. Adopting two dimensional low-Re κ-ε model and turbulence dispersion equation of passive scalar, three kind conditions of： pollution source possessing steady uniform release on upwind lane, pollution source possessing steady uniform release on downwind lane and pollution sources all had steady uniform release on both lanes were simulated respectively. The wind-tunnel test data were applied to test and verify the simulating, the results agreed very well. Under three kinds of different arrange release condition the flow field distribution was same; and at the same high level, the upwind pollutant concentration was always higher than the downwind pollutant concentration. Due to the variance of concentration gradient distribution induced by flow, oppositing the state on upwind lane, the pollutant released from pollution source on downwind lane was easier to disperse outside the street canyon.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2007年第5期604-607,共4页
China Environmental Science
基金
"985工程"科技创新平台(39000-3272000)
关键词
街道峡谷
机动车尾气
湍流模型
风洞模拟
street canyon
vehicle exhaust
turbulence model
wind-tunnel modeling
