开孔率对竖井型城市隧道阻滞工况自然通风影响的分析  

Analysis of the Influence about Opening Rate on Natural Ventilation in City Tunnel at the Status of Bloc

作　　者：朱培根[1] 仝晓娜 陈雷[1] 王春旺[1] 宋桦[1] 李晓昀[1] 

机构地区：[1]解放军理工大学,江苏南京210007

出　　处：《流体机械》2015年第7期77-81,76,共6页Fluid Machinery

摘　　要：为了分析开孔率对竖井型城市隧道在交通阻滞工况下对自然通风的影响,本文采用无量纲分析和模型试验的方法对其速度场、温度场和污染物浓度场进行了研究。通过对阻滞工况下隧道内空气所受的热压浮升力与重力的无量纲分析,得到了模型试验所需的热压通风相似准则数和温度分布相同所需散热量比例常数。利用所得相似条件搭建了开孔率分别为2.8%、3.7%、4.5%的3组试验模型进行试验。试验结果表明,随着开孔率的增大隧道内最不利通风段的通风效果得到改善,但竖井的建设费用大幅度提高。选择合适的竖井开孔率既能满足阻滞工况下隧道的通风要求,也能避免开孔率盲目增大导致的初投资浪费,对城市隧道建设具有重要意义。In order to analyze the influence of opening rate about natural ventilation in city tunnel at the block transportation,di-mensionless analysis and model experiment were used to the velocity distribution,temperature distribution and the pollutants con-centration.The similarity criterion of thermal-pressure ventilation and proportional constant of the heat with the same temperature distribution were obtained by the dimensionless analysis about the thermal buoyancy and gravity of the worst condition tunnel at bloc transportation.Three experimental models were built according to the similar conditions,the opening rates were 2.8%, 3.7%,4.5%.Results showed that with the increase of opening rate,the effect of the natural ventilation was improved,but the construction cost of vent shaft increased observably.The appropriate opening rate can meet the ventilation conditions at the bloc transportation,also can avoid the waste of the initial investment from opening rate was increased blindly.The result is of great sig-nificance to the city tunnel construction.

关 键 词：竖井型城市隧道 阻滞工况 无量纲分析 热压 开孔率 

分 类 号：TH43[机械工程—机械制造及自动化]