地铁区间隧道速度场温度场特性研究

Study on Velocity Field and Temperature Field in Subway Tunnel

综合运用缩尺模型试验、现场监测和SES数值模拟三种研究方法,分析研究地铁区间隧道速度场和温度场的特性。分析模型试验数据得到区间最大风速表达式和区间断面最大风速的滞后性。结合模型试验与数值模拟,研究得到列车匀速运行时,区间隧道风速基本不变;而列车变速运行时,区间各断面平均风速与时间成二次函数关系。通过现场监测和数值模拟等方法,分析得到地铁区间隧道温度场全天随时间变化可分为六个典型阶段;当车尾经过区间内某测点时,其温度最高。通过理论分析,建立了区间气温与壁温相互影响的数学模型,分析了不同季节区间气温和壁温的比较结果。

The air velocity and temperature fields in a subway tunnel were analyzed with scale model tests,on-site monitoring and SES numerical simulation.From the scale model test,an expression of the tunnel maximum air velocity and velocity lag property at the tunnel cross-section were obtained.The results of the scale model test and the numerical simulation show that the tunnel air velocity is always uniform at a constant train speed,and the section average air velocity has a secondary function relationship with time at variable train speeds.The on-site monitoring and the numerical simulation indicate that the tunnel air temperature variation can be divided into six typical stages all day,and the air temperature at the testing point is highest when the train rear passes.The mathematical model of the mutual influence between wall temperature and air temperature in the tunnel was established based on the theoretical analysis.The air temperature in the tunnel was also compared with the wall temperature in different seasons.