城市隧道竖井送排式通风优化  

Optimization of Ventilation with Inlet and Outlet Shafts in Urban Tunnel

作　　者：朱培根[1] 孔维同 李晓昀[1] 宋桦[1] 何轶敏 

机构地区：[1]解放军理工大学,江苏南京210007

出　　处：《流体机械》2016年第10期73-79,共7页Fluid Machinery

摘　　要：为了更有效地发挥送排风竖井在城市隧道中的通风作用,选择合理的送排风组合是一个重要的途径。本文采用CFD方法,对5种排风速度与5种送风速度的25种送排风组合进行了模拟,分析了不同送排风组合隧道内的通风效果。模拟结果表明：当送排比大于1时,隧道内会出现回流,且送排比越大,隧道回流效应越强,经济效益越低。隧道内气流分布和污染物浓度都与送排风组合有关,较大的排风速度虽有利于降低污染物浓度,但能耗也较大,过大或者过小的送风速度都会使隧道局部污染物浓度过高,降低通风作用。因此,综合考虑隧道通风经济性和实用性,确定排风速度为5-6m/s和送风速为8-12m/s为最优组合。选择合理的送排风组合,不仅能有效控制隧道污染物浓度,还能减少能量损失,对城市隧道的建设具有指导意义。In order to make full use of ventilation capacity of shafts in urban tunnel,it is an important way to choose a reasona-ble combinations of inlet and outlet rate. The CFD method is applied to simulate 25 different combinations which consist of 5 dif-ferent outlet rate and 5 different inlet rate,and the effects of combinations on ventilation effect is studied. Numerical simulation shows that there will be backing flow in short duct when inlet and outlet ratio is over 1 , and the larger inlet and outlet ratio is, the stronger backing flow and the lower economic effectiveness will be. Airflow and concentration of pollutant in tunnel is related to combinations, although the greater outlet speed decreases pollutant concentration, energy consumption increases at the same time, and larger or less inlet speed will both make pollutant concentration overtop partial area of whole tunnel as to decrease ventilation effect. Therefore,considering economical efficiency and practicability of ventilation in urban tunnel comprehensively, estimating outlet speed is during 5 -6m/s and inlet speed is during 8 -12m/s are the best combinations. Choosing reasonable combinations will not only make sure pollutant concentration is reach to standard,but also decrease wasting of energy,which is of great signifi-cance to the city tunnel construction.

关 键 词：隧道通风 送排风竖井 数值模拟 送排风组合 

分 类 号：TH43[机械工程—机械制造及自动化] TU83[建筑科学—供热、供燃气、通风及空调工程]