On the Estimates of Air and Pollutant Exchange Performance for Urban Street Canyons Using the RANS Renormalized Group κ-ε Turbulence Model

摘要：

In this study,the air exchange rate (ACH),pollutant exchange rate (PCH),average pollutant concentration ((☉)canyon),and pollutant retention time (ι) are adopted to demonstrate a mathematical formulation to quantify and compare the ventilation performance and air quality of street canyons.By using the Renormalized Group (RNG) κ-ε turbulence models,the newly developed formulation is applied to idealized two-dimensional (2D) street canyons with building-height-to-street-width (aspect) ratios 0.5,1,and 2.The spatial distributions of the roof-level mean vertical velocity and pollutant flux are investigated to elucidate the ventilation and pollutant removal mechanisms.The mean and turbulent components of ACH and PCH are calculated in which the turbulent component dominates the transport processes.

关键词： Air exchange rate (ACH) Average pollutant concentration ((☉)eanyon),Pollutant exchange rate (PCH) Pollutant retention time (ι),RNG κ-ε turbulence model Street canyon

作者: W.C.Cheng Chun-Ho Liu Dennis Y.C.Leung

作者单位: Department of Mechanical Engineering,The University of Hong Kong,Pokfulam Road,Hong Kong,China

会议类型: 国际会议

会议名称: The First International Conference on Building Energy and Environment(第一届建筑能源与环境国际会议)

会议地点: 大连

会议语种:英文

页码: 1255-1262

在线出版日期: 2008-07-01（万方平台首次上网日期，不代表论文的发表时间）