基于CFD的城市轨道交通车厢空气质量模拟分析

Air Quality of Urban Railway Carriage Based on CFD Simulation

城市轨道交通车厢的人员密度较高,车厢内的空气质量对乘坐体验及健康具有显著影响。以城市轨道交通列车车厢为例,采用CFD软件Fluent2019对正常载客情况下轨交车厢内空气质量进行数值模拟,分析空调送风风速为2、2.5、3 m/s和送风角度30°、45°、90°的温度场、速度场、污染物浓度场情况,提出在常态化防疫背景下,保证车厢最佳的空气流通率的通风方式为上送下回,送风速度为3 m/s、送风角度为垂直90°。

The air quality in the urban railway carriages has a significant impact on travelling experience and health conditions because of relatively high passenger density.Taking the train carriage of urban rail transit as an example,the computational fluid dynamics(CFD)FLUENT2019 is used to numerically simulate the air quality in the urban railway compartment with normal passenger load.The temperature distribution,velocity distribution and pollutant concentration distribution are analyzed by supply air speed of 2 m/s,2.5 m/s and 3 m/s and supply air Angle of 30°,45°and 90°,respectively.It is proposed that under the background of normalized epidemic prevention,the ventilation mode to ensure the best air circulation rate of the carriage is upper supply and lower return,the air supply speed is 3m/s and the air supply Angle is vertical 90°.