• 关键词：街道峡谷  污染物传播  机动车尾气  光化学反应  湍流模型

• 基金项目：

• 梅梦
• 武汉理工大学土木工程与建筑学院，武汉 430070

• 康鑫
• 武汉理工大学土木工程与建筑学院，武汉 430070;湖北省绿色智能建筑工程技术研究中心，武汉 430070

• 摘要：采用CFD（计算流体力学）数值模拟的研究方法，使用动网格技术，分析简单光化学反应下车辆流动及不同来流风速对双车道三维街道峡谷内污染物传播特性的影响.结果表明，车辆移动改变了峡谷内气流结构，以及背风侧与迎风侧活性污染物浓度分布的相对大小，有利于污染物在峡谷中的传播扩散；来流风使机动车尾气向建筑背风侧汇聚，并随着风速增加而加强，对近迎风侧车道车辆尾气淹没射流的影响比近背风侧车道大.在车辆移动与来流风的综合作用下，污染物的扩散能力得到显著增强.

• Abstract：Influences of vehicles’ movements and incoming winds at various speeds on the photochemically reactive pollutants’ dispersion characteristics in a three-dimensional， two-lane street canyon are investigated by using CFD numerical simulations with the dynamic mesh technique. Results show that the movement of vehicles changes the airflow structure within the canyon， and subsequently leads to a variation in the concentration distributions of the reactive species on the leeward and windward side， which is favorable for the pollutants’ dispersion. The incoming winds render the vehicle exhausts accumulated on the leeward side of the buildings， with the effects strengthened as the wind speed increases. On the other hand， the submerged jet of vehicle exhausts on the windward side lane is more impacted by the incoming winds than that on the leeward side lane. In general， under the combined effect of vehicles’ movement and incoming winds， the dispersion capability of pollutants has been significantly enhanced.

• Key words：street canyon  pollutant dispersion  vehicle exhaust  photochemical reaction  turbulence model

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