侧壁排烟口下方倾斜空气挡板促进侧向排烟效果研究  

Study on the effect of tilted air baffle below the sidewall exhaust vent to improve the lateral smoke exhaust performance

作　　者：张少刚 李尚洋 刘家豪 汪金辉 丛北华[2] Zhang Shaogang;Li Shangyang;Liu Jiahao;Wang Jinhui;Cong Beihua(School of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China;Shanghai Institute of Disaster Prevention and Relief,Tongji University,Shanghai 200092,China)

机构地区：[1]上海海事大学海洋科学与工程学院,上海201306 [2]同济大学上海防灾救灾研究所,上海200092

出　　处：《消防科学与技术》2024年第9期1247-1252,共6页Fire Science and Technology

基　　金：国家自然科学基金青年基金(51909152);交通教育学会的教育改革课题(JT2022ZD034);上海市社会发展科技项目(22dz1201102,22dz1201103)。

摘　　要：为了研究侧壁排烟效果随空气挡板倾斜角度的变化规律,探究了不同倾斜角度空气挡板作用下侧壁排烟口附近温度场与流速矢量场特征及排烟效率。结果发现:侧壁排烟口下方设置空气挡板可以有效抑制冷空气的流入,侧壁排烟效率得到明显提升。侧壁排烟口下方设置空气挡板后,排烟口附近热烟气流线明显增加,冷空气流线变得稀疏,排烟口区域高温烟气面积明显增加。当排烟口宽高比为1:2时,侧壁排烟效率随挡板倾斜角度(0≤θ≤45°)的增大而增大,在45°≤θ≤60°基本保持高位稳定,具有最佳排烟效果;当排烟口宽高比为2:1时,侧壁排烟效率随挡板倾斜角度(0≤θ≤30°)的增大而增大,在30°≤θ≤60°出现下降趋势,30°时达到排烟效率峰值。通过数据分析构建了现有条件下不同倾斜角度空气挡板作用下的侧壁排烟效率表征模型,可为隧道侧壁排烟系统设计提供相应技术参考。To study the lateral smoke exhaust performance with the air baffle,the characteristics of temperature field and flow ve-locity vector field near the lateral exhaust vent,as well as the smoke exhaust efficiency,were explored under the air baffle with different tilt angles.The results show that the air baffle below the lateral exhaust vent can effectively inhibit the inflow of cold air and improve the performance of lateral smoke extraction.After the air baffle is set below the sidewall vent,the streamline of the hot smoke near the vent increases significantly,and the cold air streamline becomes sparse,and the high-temperature smoke area in the lateral vent increases with the tilt angle of the baffle.When the exhaust vent aspect ratio is 1:2,the lateral smoke exhaust effi-ciency is increased with the larger title angle of air baffle within 0≤θ≤45°,and then remains basically unchanged with the larger title angle of air baffle,achieving the best lateral smoke exhaust performance within 45°≤θ≤60°.When the vent aspect ratio is 2:1,the lateral smoke exhaust efficiency is increased with the larger title angle of air baffle within 0≤θ≤30°,and it shows decrease trend with the larger title angle of air baffle within 30°≤θ≤60°,achieving the best smoke exhaust performance at 30°.Finally,a prediction model of lateral exhaust efficiency under air baffles with different tilting angles is obtained through data fitting,which can provide a corresponding technical guidance for the design of tun-nel lateral smoke exhaust system.

关 键 词：侧壁排烟 吸穿现象 排烟效率 空气挡板 倾斜角度 

分 类 号：X913.4[环境科学与工程—安全科学] TU998.1[建筑科学—市政工程]