射流增压作用下分散排放隧道多风口通风特性及污染物控制研究  

Study on Multiple Air-Opening Ventilation Characteristics and Pollutant Control for the Tunnel with Decentralized Exhaust under Jet Pressurization

作　　者：李保 吴凯杰 熊婧 沈航 翁佳俊 吴珂[2,3,4] LI Bao;WU Kaijie;XIONG Jing;SHEN Hang;WENG Jiajun;WU Ke(Zhejiang Institute of Mechanical&Elctrical Engineering Co,Ltd.,Hangzhou 310051;Center for Balance Architectune,Zhejiang University,Hangzhou 310007;Key Laboratory of Offsbore Geotechnical and Material Engineering of Zhejiang Province,Zhejiang University,Hangzhou 310058;Zhejiang University Zhongyuan Institute,Hangzhou 310014)

机构地区：[1]浙江省机电设计研究院有限公司,杭州310051 [2]浙江大学平衡建筑研究中心,杭州310007 [3]浙江大学浙江省海洋岩土工程与材料重点实验室,杭州310058 [4]浙江大学中原研究院,杭州310014

出　　处：《现代隧道技术》2023年第1期159-167,共9页Modern Tunnelling Technology

基　　金：浙江省自然科学基金(LY19E080028);宁波市交通运输科技计划项目(202113);中央高校基本科研业务费专项资金(226-2022-00101,226-2022-00096)。

摘　　要：为揭示顶排风口进/排风引发的隧道压力突变对分散排放隧道多风口通风特性的影响,采用计算流体力学方法对射流增压作用下成组顶排风口的进排风规律进行模拟。结果表明:顶排风口排风/进风会造成隧道内局部压力的突增/突降,分散排放隧道多个顶排风口的通风特性受射流增压、沿程阻力和风口通风引发的压力突变作用。风口间距是影响多风口风量变化的重要因素。对于排风型风口,当风口间距较小时,上游风口排风产生的压力突增将超过风口间的沿程损失,下游风口由于静压提升而排风量沿程递增;当风口间距较大时,压力突增将不足以克服风口间的沿程损失,下游风口排风量沿程递减,甚至转变为进风;对于进风型风口,风口进风量将在进风引起的压力突降和隧道沿程损失的叠加作用下沿程递增。相较于其他风机开启方式,开启风机与风口组呈交错位置关系是分散排放隧道更为高效的通风控制方式,可使隧道污染物浓度极值最小。In order to reveal the influence of the sudden change of tunnel pressure caused by air intake/exhaust of the top exhaust outlet on the multiple air opening ventilation characteristics of the tunnel with decentralized exhaust,the computational fluid dynamics method was used to simulate the air intake and exhaust laws of grouped top exhaust outlets under the action of jet pressurization. The results show that air exhaust/intake of the top exhaust outlet will cause a sudden increase/decrease of the local pressure in the tunnel, and the ventilation characteristics of multiple top exhaust outlets in the tunnel with decentralized exhaust are affected together by jet pressurization, resistance along the way and sudden pressure change caused by the ventilation at the air opening. The interval between air openings is an important factor that affects the air volume change of multiple air openings. For the exhaust type air opening, when the interval between air openings is small, the sudden pressure increase generated by the exhaust at the upstream air opening will exceed the loss along the way between air openings, and the air exhaust volume at the downstream air opening will increase along the way due to the rise of the static pressure. When the interval between air openings is large, the sudden increase of pressure will not be enough to overcome the loss along the way between air openings, and the exhaust air volume of downstream air openings will decrease along the way, or even change into air intake;For the intake type air opening, the air intake volume of the air opening will increase along the way under the superposition of the sudden pressure drop caused by the air intake and the loss along the tunnel. Compared with starting methods of other fans, the fan is started to be in the staggered position relative to the air opening group,which is a more efficient ventilation control method for the tunnel with decentralized exhaust, and it can minimize the extreme concentration of pollutants in the tunnel.

关 键 词：顶排风口 计算流体力学 隧道通风 压力突变 CO浓度极值 

分 类 号：U453.5[建筑科学—桥梁与隧道工程]