公路隧道通风流场分布及壁面压力特性研究  

Study on Distribution of Ventilation Flow Field and Wall Pressure Characteristics of Highway Tunnel

作　　者：陈爱娟 杨振峰 Chen Aijuan;Yang Zhenfeng(Nanjing Lishui District Transportation Bureau,Nanjing 211200,China;Research and Development Center of Transport Industry of Technologies and Equipments for Intelligent Design,Construction and Maintenance of Underwater Tunnel,Ministry of Transport,Nanjing 210014,China;China Design Group Co,:Ltd.,Nanjing 210014,China)

机构地区：[1]南京市溧水区交通运输局,江苏南京211200 [2]水下隧道智能设计、建造与养护技术与装备交通运输行业研发中心,江苏南京210014 [3]华设设计集团股份有限公司,江苏南京210014

出　　处：《南京工程学院学报（自然科学版）》2023年第3期79-84,共6页Journal of Nanjing Institute of Technology(Natural Science Edition)

摘　　要：为研究公路隧道不同通风方式流场及隧道壁面压力分布规律,利用流体力学软件Fluent建立隧道三维模型并进行数值模拟,对自然风与交通风在不同距离及位置条件下流场进行对比,分析不同车速对风流场和壁面压力的影响.模拟结果表明:自然风进入隧道后,随着沿程长度增加,隧道内风压逐渐减小,到出口前基本降为0 Pa,难以产生足够压力差,必须采用机械通风予以解决;在正常工况下(车速40~80 km/h),隧道内风压较大,风速在10~26 m/s,能够满足行车需求,此时无需开启风机;在交通阻滞情况下,隧道内风速在10 m/s以下,无法满足稀释空气要求,此时需要设置和开启风机.该研究为提出改善通风效果的途径提供了理论参考.Mechanical ventilation is a widely used ventilation method in tunnel operation.In order to study the flow field of different ventilation modes and the distribution law of tunnel wall pressure,the three-dimensional model of the tunnel is established by using the fluid dynamics software Fluent and numerical simulation is carried out.The flow field of natural wind and traffic wind at different distances and locations is compared,and the influence of different speeds on the air flow field and wall pressure is analyzed.The simulation results show that after the natural wind enters the tunnel,the wind pressure in the tunnel decreases gradually with the increase of the length along the tunnel,and basicaly drops to O pressure before the exit,which is difficult to generate enough pressure difference,so it must be solved by mechanical ventilation.Under normal working conditions(vehicle speed 40~80 km/h),the wind pressure in the tunnel is relatively high,and the wind speed is between 10~26 m/s,which can meet the driving demand.At this time,it is not necessary to start the fan.In case of traffic jam,the wind speed in the tunnel is below 10m/s,which cannot meet the requirements of dilution air.At this time,it is necessary to set and start the fan.This study provides theoretical basis for proposing ways to improve ventilation effect.

关 键 词：交通风 公路隧道 动网格 嵌套网格 壁面压力 

分 类 号：U453.5[建筑科学—桥梁与隧道工程]