高速公路收费亭内空气质量的数值模拟

Numerical Simulation of Air Quality in Expressway Tollbooth

为解决高速公路收费亭内空气质量差,污染严重的问题,采用正压送风的方法抑制污染物进入收费亭,运用Airpak软件,对不同送风速度和送风口位置情况下收费亭内空气质量进行了数值模拟。以汽车尾气中的NO2为代表气体,提出了评价室内空气质量的新的评价指标N。计算结果表明:送风速度对收费亭内空气质量有一定影响,增加送风速度有利于改善收费亭内空气质量,从而抑制NO2气体通过收费亭窗口进入收费亭。将送风口正对人体布置时,送风速度达到1.8 m/s时就可以保证工作人员呼吸区域的空气质量达到规定标准。送风口高度为1.5 m时对空气质量改善效果要优于1.3 m。送风口布置在西墙(人体左侧)效果比北墙(正对人体)的效果要差。

In order to solve the problem of poor air quality and pollution in highway toll booths,the method of positive pressure delivery wind is used to restrain pollutants from entering toll booths,and Airpak software is used to simulate the air quality in toll booths under different wind delivery speeds and air vent locations.With NO2 in automobile exhaust as the representative of gas,a new evaluation index N is proposed to evaluate indoor air quality.The results show that the air delivery speed has a certain effect on the air quality in the toll booth,and increasing the air delivery speed is conducive to improving the air quality in the toll booth,thus inhibiting NO2 gas from entering the toll booth through the toll booth window;S can ensure that the air quality of the staff breathing area to meet the required standards,air vent height of 1.5 m to improve the air quality effect is better than 1.3 m,the air feed arrangement in the west wall(left side of the human body)effect is worse than the north wall(positive to the human body).