基于Fluent的不同相位T型交叉口内机动车尾气扩散规律研究  

Study on Vehicle Exhaust Diffusion Law in Different Phase T-Intersections based on Fluent

作　　者：王忠昶 孙剑 陈阳 夏洪春[2] WANG Zhongchang;SUN Jian;CHEN Yang;XIA Hongchun(School of Traffic and Transportation Engineering,Dalian Jiaotong University,Dalian 116028,China;School of Civil Engineering and Architecture,Dalian University,Dalian 116622,China)

机构地区：[1]大连交通大学交通运输工程学院,辽宁大连116028 [2]大连大学建筑工程学院,辽宁大连116622

出　　处：《大连交通大学学报》2022年第5期19-23,共5页Journal of Dalian Jiaotong University

基　　金：国家自然科学基金资助项目(51574055);辽宁省‘兴辽英才计划’资助项目(XLYC1807219)。

摘　　要：为研究不同交通信号控制下T型交叉口的机动车污染物扩散特性,采用Fluent软件对典型三相位信号配时控制下汽车尾气的污染物扩散过程进行模拟,并与风洞试验进行对比分析.结果表明:不同相位所控制的交叉口大气流线变化显著;与风向相平行的街谷内部流线运动较为规则,流线受相位改变扰动程度较轻;垂直高度为1.5 m的截面上,污染范围主要分布于交叉口内建筑物背风侧,浓度保持稳定扩散,仅在车流交织点和机动车道出现污染物积聚现象,T型交叉口内上风向建筑受车流尾气影响较为严重;随着垂直高度的上升,污染物主要沿与风向平行的街谷内部扩散,且在该街谷内和交叉口中心处形成两个重污染区域.研究成果可从环境影响的角度为交叉口的建设、周边建筑物的规划及对行人出行提供合理的参考.In order to study the pollutant diffusion characteristics of motor vehicles at T-junctions under different traffic signals,Fluent software was used to simulate the pollutant diffusion process of vehicle exhaust under the control of typical three-phase signal timing and compared with wind tunnel tests.The analysis results show that the atmospheric flow lines at intersections controlled by different phases change significantly.The internal flow lines in the valleys are parallel to the wind direction move more regularly,and the flow lines are less disturbed by the phase change.In the vertical section height of 1.5 m,the pollution range is mainly distributed on the leeward side of the buildings in the intersection with stable diffusion,and the accumulation of pollutants occurs only at the intersection of traffic and motor lanes.The buildings upwind in T-shaped intersections are more seriously affected by the traffic exhaust.As the vertical height is increased,the pollutants spread mainly along the inside of the street valley parallel to the wind direction,and two heavily polluted areas are formed in the street valley and at the center of the intersection.The research results can provide a reasonable reference for the construction of intersections,the planning of surrounding buildings,and the travel of pedestrians from the perspective of environmental impact.

关 键 词：T型交叉口 相位 机动车尾气 数值模拟 扩散规律 

分 类 号：X734.2[环境科学与工程—环境工程] U491.92[交通运输工程—交通运输规划与管理]