地铁车站模型内流场的实验测定及数值模拟

Experimental and numerical investigations on the flow field in a subway-station model

CFD技术及其商业软件的发展使人们可以用数值模拟的方法预测地铁车站内环境,评价通风效果,改进通风排烟系统的设计,在提供舒适环境的同时,进一步降低能耗。为了对数值计算结果进行检验,对某地铁车站模型内的气流组织进行了实验测定,并采用商业软件Fluent对地铁车站模型内的速度场进行了数值模拟。在数值计算中采用κ-ε方程作为紊流模型,以现场实测数据作为边界条件,计算结果与实测数据吻合较好。结果表明,采用商业软件对地铁车站内气流组织的数值模拟可以获得较准确的车站内流场的详细数据,从而可以对整个通风排烟系统进行全面评价。

The development of the CFD technique and its commercial software enables people to use simulation methods to predict the interior environment of subway stations, to appraise the ventilation effect, and to improve the design of the ventilation and fume-discharge system. The energy consumption can be reduced further, while a comfortable environment can be provided. In this paper, the velocity field in a subway station model was simulated using the Fluent software. In order to check up the simulation results, we carried out experiments on the air flows in the model. In the simulation, we used the ~＇-c equation as the turbulent model, and use the measured data as the boundary conditions. The simulation results agree fairly well with the measured data. The results of the investigations show that by simulating the air flows in the subway station model using the commercial software, fairly accurate data on the interior flow fields can be obtained, which allow us to carry out a comprehensive appraisal of the entire ventilation and fume-discharge system.