Study on airflow development characteristics and ventilation effect under multiple jet fans in a large section tunnel

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-03-31 DOI:10.1016/j.tust.2024.106340

Xinyue Zhang , Peng Zhang , Guangyan Liu , Liangliang Tao , Yanhua Zeng , Xiaohan Zhou , Xu Liu

{"title":"Study on airflow development characteristics and ventilation effect under multiple jet fans in a large section tunnel","authors":"Xinyue Zhang , Peng Zhang , Guangyan Liu , Liangliang Tao , Yanhua Zeng , Xiaohan Zhou , Xu Liu","doi":"10.1016/j.tust.2024.106340","DOIUrl":null,"url":null,"abstract":"<div><div>The number and type of parallel jet fans used for tunnel ventilation are often determined based on engineering experience, and it is necessary to explore the characteristics of airflow development of jet fans to improve tunnel environment. In this paper, air velocity, wind pressure, turbulence intensity and ventilation effect in tunnels with different numbers of parallel jet fans are analyzed by 1:25 model test and CFD numerical simulation. The results show that air velocity in tunnel after the development of uniformity is 1.3 m/s, 1.9 m/s and 2.5 m/s when the outlet air velocity of jet fans is 20 m/s and the number of jet fans in parallel is 1, 2 and 3 respectively, and the relationship equation of the attenuation of air velocity along the longitudinal direction of tunnel has been obtained. As the number of fans <em>i</em> increases, the uplift pressure coefficient <em>η</em> reduce, and the range of <em>η</em> is 0.82 ∼ 0.96. Considering the number of fans in parallel, outlet air velocity, diameter and other factors affecting the ventilation effect in the tunnel under different jet fan configuration schemes, it is found that the installation of two parallel jet fans can provide a more comfortable driving environment while reducing the ventilation energy loss; the age of the air in the tunnel is younger and the ventilation effect is better with the use of jet fans of large diameter and small air velocity; for a three-lane tunnel with a width of 12.50 m, it is recommended to adopt the scheme of arranging two parallel fans in each section, with a fan diameter of 1458 mm and an outlet air velocity of 25 m/s.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"161 ","pages":"Article 106340"},"PeriodicalIF":6.7000,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tunnelling and Underground Space Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0886779824007582","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

The number and type of parallel jet fans used for tunnel ventilation are often determined based on engineering experience, and it is necessary to explore the characteristics of airflow development of jet fans to improve tunnel environment. In this paper, air velocity, wind pressure, turbulence intensity and ventilation effect in tunnels with different numbers of parallel jet fans are analyzed by 1:25 model test and CFD numerical simulation. The results show that air velocity in tunnel after the development of uniformity is 1.3 m/s, 1.9 m/s and 2.5 m/s when the outlet air velocity of jet fans is 20 m/s and the number of jet fans in parallel is 1, 2 and 3 respectively, and the relationship equation of the attenuation of air velocity along the longitudinal direction of tunnel has been obtained. As the number of fans i increases, the uplift pressure coefficient η reduce, and the range of η is 0.82 ∼ 0.96. Considering the number of fans in parallel, outlet air velocity, diameter and other factors affecting the ventilation effect in the tunnel under different jet fan configuration schemes, it is found that the installation of two parallel jet fans can provide a more comfortable driving environment while reducing the ventilation energy loss; the age of the air in the tunnel is younger and the ventilation effect is better with the use of jet fans of large diameter and small air velocity; for a three-lane tunnel with a width of 12.50 m, it is recommended to adopt the scheme of arranging two parallel fans in each section, with a fan diameter of 1458 mm and an outlet air velocity of 25 m/s.

查看原文本刊更多论文

大断面隧道多扇射流下气流发展特性及通风效果研究

用于隧道通风的并联射流风机的数量和类型往往是根据工程经验确定的，有必要探索射流风机的气流发展特性，以改善隧道环境。本文通过1:25模型试验和CFD数值模拟，分析了不同并联风机数量隧道内的风速、风压、湍流强度和通风效果。结果表明：当喷流风机出口风速为20 m/s，平行喷流风机数量分别为1、2、3时，均匀性发展后的隧道内风速分别为1.3 m/s、1.9 m/s和2.5 m/s，并得到了沿隧道纵向风速衰减的关系方程；随着风机数量i的增加，升压系数η减小，η范围为0.82 ~ 0.96。考虑不同射流风机配置方案下并联风机数量、出口风速、直径等影响隧道内通风效果的因素，发现安装两台并联射流风机可以提供更舒适的行驶环境，同时减少通风能量损失；采用大直径、小风速的射流风机，巷道内空气龄更年轻，通风效果更好；对于宽度为12.50 m的三车道隧道，建议采用每段布置两台平行风机的方案，风机直径为1458 mm，出口风速为25 m/s。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.