地铁水平活塞风阀速度场特性实测研究

通过对不同工况下车站两端水平活塞风阀速度场的实测研究,得到进站端和出站端水平活塞风阀风速值分别呈现3个和2个典型变化阶段,定量分析了各阶段风速持续时间和换气体积特点。对比分析得到出站端水平活塞风阀的风速持续时间和速度特征值均高于进站端水平活塞风阀,双风井同时开启工况风阀处换气体积最大,区间通风效果最佳,其次为单独开启出站端活塞风井的工况。

Field Measurement Study on Velocity Characteristics of Horizontal Piston Wind Valve in Subway

This study focuses on the velocity changing characteristics of the horizontal piston wind valves on both sides of the subway station by on-site measurement under winter condition. It has been found that the valve velocity in train-arriving direction presents three typical phases while the valve wind speed in train-leaving direction has two distinct processes. The velocity duration in each phase is investigated and the related ventilation volume is calculated. It has been revealed that the velocity duration of the valve on train-leaving end is longer than that of the valve on train-arriving end. Besides, the maximum and the average velocity values of the valve on train-leaving end are much higher too. It is concluded that, compared with the two single shaft condition, the dual shaft condition has the biggest ventilation volume and the best air-changing effect. The next recommended condition is the single shaft design on train-leaving end.