隧道风井旋流现象对污染物扩散的影响
Influence of rotational flow phenomenon in tunnel air shaft on pollutant dispersion
摘要：
基于CFD模拟和实测数据，比较了考虑旋流模型和面源模型下风井所排放污染物的扩散情况，并以落地浓度评估其环境影响。研究表明，因城市隧道风井建设条件限制，风井偏离隧道正上方，致使风井内气流存在旋流，现有面源模型对风井的污染物扩散效果有所低估。
关键词：城市隧道；风井；污染物扩散；旋流；面源模型；落地浓度
Abstract：
Based on the CFD simulation and the test data, the dispersion of pollutants from air shaft under considering rotational flow model and surface source model is compared, and the environmental impact is evaluated by landing concentration. The research shows that due to the limited construction conditions, the air shaft deviates from the upward side of the tunnel, resulting in the phenomenon of rotational flow, so the existing surface source model underestimates the pollutant dispersion effect of the air shaft.
Keywords:citytunnel;airshaft;pollutantdispersion;rotationalflow;surfacesourcemodel;landingconcentration