工字型城市地下人行通道的通风环境与优化设计研究

Study on Ventilation Environment and Optimization Design of Urban I-shaped Pedestrian Underpass

为探讨我国南方多雨、湿热地区城市常采用的工字型地下人行通道的内部通风环境,揭示其夏季易潮湿结露的成因,对武汉市岳家嘴工字型地下人行通道进行现场监测;内容包括通道内的空气温度、湿度、壁面温度、风速等。借助CFD数值模拟,与实测成果进行了对比研究。结果表明:工字型地下人行通道的主通道难以实现有效的自然通风,夏季通道内处于高湿状态,易出现严重的结露状况。利用马格努斯(Magnus)公式阐释了结露现象产生的原因。对工字型地下人行通道的布局方案进行优化,利用CFD数值模拟对不同优化模型进行对比,验证了优化方案的合理性,可为南方城市修建地下人行通道工程提供借鉴。

In order to explore the ventilation environment and reveal the condensation mechanism of I-shaped pedestrian underpass adopted by cities in the rainy and humid regions in south areas of China in summer,on-site monitoring of Yuejiazui pedestrian underpass in Wuhan was carried out,including air temperature,humidity,wall temperature,wind speed,and other parameters. A contrastive analysis was made between CFD numerical simulation and the measured data. Results show that natural ventilation is difficult to achieve in main channel of the Ishaped pedestrian underpass. The underpass is often in state of high humidity and prone to condensation in summer. The reason of condensation phenomenon can be explained by Magnus formula. Different optimization models of I-shaped pedestrian underpass are compared by CFD numerical simulation,and the rationality of the optimization scheme is verified. It can provide reference for the construction of pedestrian underpass project in the southern city of China.