汽车尾气烟羽的形成及地下车库排风方式

指出停车库内汽车尾气的流动过程可看作烟羽的形成过程。针对上排风、下排风及上、下同时排风3种排风方式分别进行了气流显示实验，根据得到的图片对汽车尾气烟羽的形成和发展过程进行了分析；对前2种排风方式下的排风量进行了测定。结果表明，3种排风方式下汽车尾气烟羽的形成过程基本相同；排风口面积相同的情况下，上排风的排风量大于下排风。指出地下车库以下排风为主的通风系统的不合理性，建议采用上排风方式。

Formation of automobile emission plume and air exhaust mode of underground parking garages

Points out that the automobile emission is act ua lly a form of thermal plume. Makes flow visualized experiments separately for th ree exhaust modes, i.e. exhaust from upper part, lower part and simultaneously f rom upper and lower part of a garage, and analyses the formation and development process of the plume based on the obtained pictures. Measures exhaust air rate for the first two modes. The results show that the formation process of the plum e is basically the same for the three modes and that exhaust air rate for the fi rst exhaust mode is larger than that of the second in the case of the same air o utlet area. Points out inappropriateness in adopting the mode of exhaust mainly from lower part of an underground parking garage, and recommends the mode of exh aust from upper openings.