排烟管道顶部接风管对带上盖车辆基地排烟效果的影响

提出了一种提高带上盖车辆基地机械排烟效果的方法，即设置顶部接风管。采用CFD 流体力学数值模拟软件对顶部接风管的排烟效果进行研究。设置了4 种开孔方式、3 种顶部接风管开孔个数以及不同排烟量，通过测量带上盖车辆基地烟气层高度、盖板下方温度、能见度、CO 浓度进行对比分析。结果表明：4 种开孔方式排烟效果从好到差依次为顶部接风管四周侧部开孔、顶部开孔、侧部开孔、底部开孔；顶部接风管开孔个数减少对排烟效果无明显影响，但会增大排烟口风速；设置顶部接风管会提升带上盖车辆基地的机械排烟量，能明显提升其排烟效果。

Influence of top branch pipe of exhaust pipe on the exhaust effect of a covered vehicle base

A method to improve the mechanical smoke exhaust effect of a vehicle base with a cover by setting up a top branch pipe was proposed. CFD fluid dynamics numerical simulation software was used to study the smoke exhaust effect of the top branch pipe. Four openings embodiment, three kinds of top air duct openings and different amount of smoke were provided, the comparative analysis was conducted through measuring the height of smoke layer, temperature under the cover, visibility and CO concentration of vehicle base with upper cover. The results showed that the smoke exhaust effect of the four kinds of openings is in the order of good to poor as top branch pipe, top opening, side opening, bottom opening.The reduction of the number of openings in the top branch pipe has no significant effect on the smoke exhaust effect, but it will increase the air velocity at the smoke vent. The mechanical smoke exhaust volume of the vehicle base with the upper cover will be increased by setting the top branch pipe, which can improve the smoke exhaust effect significantly.