汽车尾气的初期扩散与扩散参数

THE INITIAL DISPERSION AND DISPERSION PARAMETERS OF VEHICLE POLLUTANTS

通过风洞模拟实验，分析研究汽车尾流区的流场特性，确定了汽车机械扰动产生的尾气初期扩散范围，提出了一种考虑初期扩散影响的确定近距离扩散参数的简易方法。现场示踪实验和实测资料的验证表明，用该方法确定尾气扩散参数是可靠的。

it was surmised that the physical movement of vehicles on a typical line source,a highway,would create a well-mixed region of pollutants surrounding the highway.From the plume studies in NJU(Nanjing University)wind tunnel,the limits of the mixing cell were approximately equal to Wo(the width of all lanes plus 1.5 meter on each side of highway) and the hight of the vehicle(3 meters),the initial vertical dispersion parameter was 1.30 and the initial horizontal dispersion parameter was set equal to Wo/4.3.Interpolative curves were then drawn between the initial dispersion parameters and the original passquill parameters.