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首页> 外文期刊>Advances in Structural Engineering >Aerodynamic characteristics of trains on a viaduct with non-uniform cross-section under crosswinds by wind tunnel tests
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Aerodynamic characteristics of trains on a viaduct with non-uniform cross-section under crosswinds by wind tunnel tests

机译：风隧道试验在交叉风下的高架桥培训的空气动力学特征

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摘要

This paper focuses on the aerodynamic characteristics of trains on a non-uniform double-track railway bridge under crosswinds through a scaled 1:40 sectional model wind tunnel test. Pressure measurements of five cross-sections of two types of trains, one with round roof and one with blunt roof, at the upstream and downstream tracks of the bridge were conducted under crosswinds with wind attack angles between -12 degrees and 12 degrees. The mean wind speed and turbulence intensity profiles around the windward surface of the train in the downwind and upward directions were also measured using cobra probe to obtain the boundary layer above the bridge surface. The results show that the shapes of train and bridge, as well as the wind attack angle, affect the aerodynamic characteristic of the train on the non-uniform bridge girder. The mean and fluctuating pressure coefficients are similar for all five cross-sections of the trains while the train is at the upstream track. However, when the train is at the downstream track, the extreme mean and fluctuating pressure coefficients around the windward and top surfaces of each cross-section on the train are different. At the downstream track, the mean wind speed profile and the turbulence intensity profile around the top of the train vary dramatically due to the separation flow caused by the leading edge of the bridge girder.
机译：本文重点研究上的非均匀复线桥列车的空气动力学特性下侧风通过缩放1:40截面模型风洞试验。的两种类型的列车中，一个具有圆形屋顶和一个钝的屋顶，在桥的上游和下游轨道的5横截面压力测量根据与-12度和12度之间的风攻角侧风进行。围绕在顺风和向上方向列车的迎风面的平均风速和湍流强度分布用眼镜蛇探针以获得桥梁表面上方的边界层还测量。结果表明，火车和桥，以及风攻角的形状，影响对非均匀桥桁火车的空气动力学特性。的平均值和脉动压力系数是对于列车的所有五个横截面相似，而列车是在上游轨道。然而，当列车是在下游轨道，绕迎风极端均值和脉动压力系数和在火车上的每个横截面的顶面是不同的。在下游轨道，平均风速曲线和周围的列车的顶部的湍流强度分布由于由桥桁的前缘分离流动显着变化。

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  • 来源
    《Advances in Structural Engineering》 |2021年第9期|1769-1781|共13页
  • 作者

    Yu Kehui; He Xuhui; Cai Chenzhi; Yan Lei; Zou Yunfeng;

  • 作者单位

    Cent South Univ Sch Civil Engn 22 Shaoshan South Rd Changsha 410075 Hunan Peoples R China;

    Cent South Univ Sch Civil Engn 22 Shaoshan South Rd Changsha 410075 Hunan Peoples R China|Natl Engn Lab High Speed Railway Construct Changsha Hunan Peoples R China|Joint Int Res Lab Key Technol Rail Traff Safety Changsha Hunan Peoples R China;

    Cent South Univ Sch Civil Engn 22 Shaoshan South Rd Changsha 410075 Hunan Peoples R China|Natl Engn Lab High Speed Railway Construct Changsha Hunan Peoples R China;

    Cent South Univ Sch Civil Engn 22 Shaoshan South Rd Changsha 410075 Hunan Peoples R China|Natl Engn Lab High Speed Railway Construct Changsha Hunan Peoples R China;

    Cent South Univ Sch Civil Engn 22 Shaoshan South Rd Changsha 410075 Hunan Peoples R China|Natl Engn Lab High Speed Railway Construct Changsha Hunan Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    aerodynamic characteristics; non-uniform bridge girder; train-bridge system; wind attack angle; wind profile; wind tunnel test;

    机译：空气动力学特性;非均匀桥梁;火车桥系统;风攻击角;风剖面;风隧道试验;

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