基于动网格的地铁活塞效应非稳态气流模拟  

Numerical Simulation of Unsteady Airflow in Subway Influenced by Piston Effect Based on Dynamic Mesh

作　　者：由世俊[1] 薛鹏[1] 张欢[1] 

机构地区：[1]天津大学环境科学与工程学院,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2014年第2期168-173,共6页Journal of Tianjin University：Science and Technology

基　　金：国家'十二五'科技支撑计划资助项目(2011BAJ08B08-2)

摘　　要：活塞效应是影响地铁隧道和站台气流非稳态流动的主要因素,为此采用现场试验和数值模拟的方法对气流进行分析.其中,实验选在装有安全门的运行车站,并记录列车运行时的测点风速.数值研究基于实验车站的全尺寸模型,并利用动网格技术对其模拟.研究结果表明,采用标准k-ε方程的模拟方法结果和实验数据吻合较好,证明其适用于高雷诺数的隧道模拟研究.研究同时发现,活塞风在站台前后两个联接处(迂回风道和活塞竖井)中表现出比较稳定的分流和吸风比率,且无论在开式系统还是闭式系统状态下,进入迂回风道和吹入站台的风量是成特定比例关系的.Piston effect has great influence on unsteady airflow in the subway station and tunnel. In this paper,in-situ measurement data and computational fluid dynamics（CFD）method are used to analyze the three-dimensional unsteady air flow in the subway station and tunnel. The experimental analysis of train-induced unsteady flow was conducted in a real station with platform bailout doors（PBD）and air velocity variations with time were recorded. Dynamic mesh method is used for the full-scale model in the unsteady numerical analysis. The results indicate that standard k-εequa-tion is appropriate for the simulation of the high Reynolds number airflow in tunnel and station as it agrees well with the experimental data. There exist specific diversion and suction ratios in each channel of the airflow for piston wind. And the proportion between bypass duct and platform is stable in either open system or close system. The results of this study can be utilized as basic data for operating tunnel ventilation systems.

关 键 词：标准k-ε方程 活塞风阀 迂回风道 全尺寸模型 分流比率 

分 类 号：TU834[建筑科学—供热、供燃气、通风及空调工程]