Aerodynamic Characteristics of High-speed Train Pantographs Based on Jet Flow Control

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-07-01 DOI:10.47176/jafm.17.7.2316

S. Huang, B. D. Zhang, †. Z.W.Li, J. P. Zhao, W. J. Peng, J. R. Lin

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Abstract

The pantograph is a critical instrument that significantly affects the aerodynamics of high-speed trains, posing a considerable challenge to the energy conservation and environmental protection of trains. This study explores the feasibility and efficiency of a jet-flow control technique in optimising the aerodynamic characteristics of the pantograph. A numerical method was adopted to investigate the effects of various jet-flow parameters, such as the jet positions, velocities and jet-slot widths, on the flow changes around the pantograph and subsequent reduction in aerodynamic drag of the pantograph. The results show that the impact of the jet position is negligible when the jet velocity is lower than the train speed. The aerodynamic drag reduction rate decreased with increasing distance from the pantograph as the jet velocity increased. When the distance between the jet slot and pantograph is less than 0.6 times the height of the pantograph, the aerodynamic drag reduction rate continuously increased with the jet velocity. As the jet slot moved away from the pantograph, the aerodynamic drag reduction rate initially increased rapidly with the jet velocity and then gradually decreased when the velocity surpassed 1.2 times the train speed. In addition, the aerodynamic drag of the pantograph decreased as the width of the jet slot decreased. However, the energy of the whole train can be only saved when the jet velocity is below 0.6 times the train speed. Findings in this study verified the effectiveness of the jet-flow method in reducing the aerodynamic drag of pantographs and

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基于喷流控制的高速列车受电弓的空气动力特性

受电弓是严重影响高速列车空气动力学性能的关键设备，对列车的节能和环保提出了巨大挑战。本研究探讨了喷流控制技术在优化受电弓空气动力学特性方面的可行性和效率。采用数值方法研究了各种射流参数（如射流位置、速度和射流槽宽度）对受电弓周围气流变化的影响，以及随后对降低受电弓气动阻力的影响。结果表明，当射流速度低于列车速度时，射流位置的影响可以忽略不计。随着射流速度的增加，气动阻力降低率随受电弓距离的增加而降低。当喷射槽与受电弓之间的距离小于受电弓高度的 0.6 倍时，气动阻力降低率随喷射速度的增加而持续增加。当射流槽远离受电弓时，气动阻力降低率最初随射流速度的增加而迅速增加，当射流速度超过列车速度的 1.2 倍时，气动阻力降低率逐渐降低。此外，受电弓的空气阻力随着喷射槽宽度的减小而减小。然而，只有当射流速度低于列车速度的 0.6 倍时，整个列车的能量才能得到节省。本研究的结果验证了喷射流方法在减少受电弓空气阻力方面的有效性，同时也证明了喷射流方法的可行性。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.