横风作用下高速铁路桥梁全封闭声屏障气动特性的风洞试验研究

为研究高速铁路桥梁全封闭声屏障的横风气动特性,通过节段模型风洞试验对全封闭声屏障的三分力和表面风压进行了测试,分析了风速、雷诺数效应、风攻角、侧视断面位置对全封闭声屏障气动特性的影响。结果表明:在不同风速下测力和测压结果的规律相似;雷诺数效应对全封闭声屏障的横风气动特性和顶部的风压分布影响较大;风攻角对全封闭声屏障的阻力系数有较大影响;不同断面的风压分布曲线具有相似的规律,本文给出了设计用的近似风压曲线。

Research on Wind Tunnel Tests for Aerodynamic Characteristics of Closed Noise Barriers on High Speed Railway Bridges Under Crosswinds

In order to investigate the aerodynamic characteristics of closed noise barriers on high speed railway bridges under crosswinds,the three-component force and surface wind pressure of closed noise barriers were tested by wind tunnel tests with section models,and the inf luences of wind speed,Reynolds number effect,wind attack angle and section position on the aerodynamic characteristics of closed noise barriers were analyzed.The results show that the aerodynamic force and pressure distribution have a similar law at different wind speeds.Reynolds number effect has a great inf luence on crosswind aerodynamic characteristics and wind pressure distribution at the top of closed noise barriers.The wind attack angle has an obvious effect on the drag coefficients of closed noise barriers.The wind pressure distribution curves of different sections have similar laws,and the approximate wind pressure curves for design were given.