桥上风传感器安装方式对测量结果的影响

Influence of Installation Mode of Wind Sensor on Bridge on Measurement Results

风传感器所附着的结构对其周围流场产生扰动,导致不同安装方式的风传感器测量结果存在区别。基于雷诺平均方法和k-ω湍流模型,采用计算流体力学方法对桥上不同风传感器安装方式产生的测量结果进行仿真分析研究。风传感器的安装方式包括水平外伸、边缘竖直、接触网柱三种,采用这三种方式分别在上下游安装,共计形成6个风测点,风速变化范围为10~30 m/s,风攻角变化范围为-5°~5°,通过改变外伸长度或安装高度来调整安装位置。结果表明:三种风传感器安装方式测量结果均会受桥梁结构的影响,位于尾流区的风传感器受影响较大,不能真实反映来流风速;风速对测点风速与来流风速之比影响不大,正风攻角下位于下游侧的传感器实测风速会大幅减小。

The structure attached to the wind sensor causes disturbance to the surrounding flow field,resulting in differences in the measurement results of wind sensors installed in different ways.Based on Reynolds averaging method and the k-ωturbulence model,the computational fluid dynamics method was used to simulate and analyze the measurement results generated by different installation methods of wind sensors on the bridge.The installation modes of wind sensors include horizontal extension,vertical at bridge sides,and catenary column.These three modes are used to install them upstream and downstream,forming a total of six wind measurement points.The wind speed changes in the range of 10~30 m/s,and the wind attack angle changes in the range of-5°~5°.The installation position is adjusted by changing the extension length or installation height.The results show that the measurement results of the three installation modes of wind sensors are all affected by the bridge structure,and the wind sensors located in the wake area are greatly affected and cannot truly reflect the incoming wind speed.The wind speed has little effect on the ratio of wind speed at the measuring point to the incoming flow wind speed,and the measured wind speed measured by the sensor located downstream at the positive wind attack angle will significantly decrease.