机动车在公路近路面层NOx排放扩散规律

NOx Emissions Rule of Motor Vehicles near Road Surface

为研究道路空间机动车尾气光催化降解效能测试系统,应用流体运动的RNG模型对NOx的湍流和空间分布扩散规律进行了数值模拟,并对公路近路面层机动车NOx排放的扩散规律进行了分析与评价,结果表明:汽车排放的NOx未随汽车尾部的较强空气涡系而上升或迅速扩散,而是随热量的快速散失在流动中下沉并趋向于路面,最终随涡系的发展而向空气中缓慢扩散。

A numerical simulation was conducted on turbulence, spatial distribution, and emission rule of NOx using RNG model, aiming to develop a testing system for photocatalysis degradation efficiency applied on road surface. NOx emission rule of motor vehicles near road surface was analysed and evaluated. Resuhs showed that NOx did not rise or diffuse following the strong eddies behind car tail, but set down and reached the ground surface rapidly, and then followed eddies and diffused into air slowly.