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Parameter optimization for improved aerodynamic performance of louver-type wind barrier for train-bridge system

基于车-桥系统气动性能分析的百叶窗型风屏障参数优化

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Abstract

To improve the safety of trains running in an undesirable wind environment, a novel louver-type wind barrier is proposed and further studied in this research using a scaled wind tunnel simulation with 1:40 scale models. Based on the aerodynamic performance of the train-bridge system, the parameters of the louver-type wind barrier are optimized. Compared to the case without a wind barrier, it is apparent that the wind barrier improves the running safety of trains, since the maximum reduction of the moment coefficient of the train reaches 58% using the louver-type wind barrier, larger than that achieved with conventional wind barriers (fence-type and grid-type). A louver-type wind barrier has more blade layers, and the rotation angle of the adjustable blade of the louver-type wind barrier is 90–180° (which induces the flow towards the deck surface), which is more favorable for the aerodynamic performance of the train. Comparing the 60°, 90° and 120° wind fairings of the louver-type wind barrier blade, the blunt fairing is disadvantageous to the operational safety of the train.

摘要

为提高列车在复杂风环境中行车的安全性,本文采用1:40 的缩尺模型进行风洞模拟试验,针对 提出的一种新型百叶窗型风屏障对列车和桥梁的气动影响展开研究,并基于车-桥系统气动特性对百 叶窗型风屏障的自身参数进行了优化分析。试验结果表明:设置风屏障可明显提高列车运行安全性, 设置百叶窗型风屏障相对不设置风屏障列车扭矩系数减小58%;百叶窗型风屏障的防风效果优于传统 风屏障(栅栏型和多孔型)的防风效果;百叶窗型风屏障的叶片层数较多、叶片角度旋转范围在 90°~180°范围内(使气流导向桥面)时更利于列车安全运行;百叶窗叶片风嘴较钝时不利于车桥气动 安全,其中叶片风嘴角度为60°时更优,90°时最不利。

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Authors and Affiliations

  1. School of Civil Engineering, Central South University, Changsha, 410075, China

    Xu-hui He  (何旭辉), Huan Li  (李欢) & Kang Shi  (史康)

  2. National Engineering Laboratory for High Speed Railway Construction, Changsha, 410075, China

    Xu-hui He  (何旭辉), Huan Li  (李欢) & Kang Shi  (史康)

  3. Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Changsha, 410075, China

    Xu-hui He  (何旭辉)

  4. China State Construction International Investments (China) Limited, Shenzhen, 518000, China

    Dong-xu Fang  (方东旭)

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  1. Xu-hui He  (何旭辉)
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  2. Dong-xu Fang  (方东旭)
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  3. Huan Li  (李欢)
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  4. Kang Shi  (史康)
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Corresponding author

Correspondence to Dong-xu Fang  (方东旭).

Additional information

Foundation item: Project(2017T001-G) supported by the Science and Technology Research and Development Program of China Railway Corporation; Project(2017YFB1201204) supported by the National Key Research and Development Program of China; Project(U1534206) supported by the National Natural Science Foundation of China; Project(2015CX006) supported by the Innovation-driven Plan in Central South University, China; Project(2017zzts521) supported by the Fundamental Research Funds for the Central Universities, China

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He, Xh., Fang, Dx., Li, H. et al. Parameter optimization for improved aerodynamic performance of louver-type wind barrier for train-bridge system. J. Cent. South Univ. 26, 229–240 (2019). https://doi.org/10.1007/s11771-019-3996-8

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  • DOI: https://doi.org/10.1007/s11771-019-3996-8

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