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Aerodynamic effects of trains circulating through a bifurcated tunnel

列车通过分岔隧道的气动效应研究

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Abstract

In practice, bifurcated railway tunnels are occasionally employed in the construction of long tunnels due to specific geological reasons. However, the aerodynamic behaviors of trains moving through such complex tunnels are not yet fully understood. To address this issue, this study analyzes the aerodynamic interactions produced by a high-speed train moving through a bifurcated tunnel in different directions. A three-dimensional, unsteady, compressible method based on the RNG k-ε turbulence model is used to simulate the train motion in the tunnel. Additionally, the simulation algorithm is validated by comparing the data with full-scale experimental results. The analysis includes the examination of aerodynamic loads and transient pressures on both train surface and tunnel wall. The results indicate that the maximum peak-to-peak pressures on train surface and the the single-track tunnel wall of DTE (double-track tunnel as entry) scenario are larger than that of STE (single-track tunnel as entry). Moreover, for the DTE scenario, the energy consumption of the train moving through the tunnel is significantly higher, and the average drag of the leading vehicle is increased by 19.2% compared with the STE. However, the side force of the leading vehicle for the STE is 26% higher than that of the DTE. The research findings presented in this paper can serve as a valuable aerodynamic reference for the design and construction of specialized tunnels.

摘要

长大铁路隧道受特殊地质条件影响可采用分岔隧道建造。然而,列车高速穿越这种复杂构型的 隧道时所引起的空气动力学效应尚不清楚。为此,本文采用三维、可压缩、非定常的雷诺时均模型, 模拟研究了高速列车从不同方向通过分岔隧道时引起的气动效应。研究内容主要包括入口隧道结构为 单线隧道(STE)和双线隧道(DTE)两个运行环境下的车体表面和隧道壁面的压力波动、列车气动力和周 围流场特征等。研究结果表明,相比STE场景,DTE场景下车体表面和单线隧道壁面的压力峰峰值更 大,并且气动阻力能耗也更大,头车的平均阻力增大19.2%。然而,STE场景下列车的侧向力波动更 剧烈,其峰值相比DTE场景增加26%。本文的研究发现可为特殊铁路隧道的设计和建造提供有价值的 空气动力学参考。

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Authors and Affiliations

  1. Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha, 410075, China

    Feng-yan Fang  (方丰彦), Tang-hong Liu  (刘堂红), Yu-tao Xia  (夏玉涛), Bin Xu  (许彬), Xin-ran Wang  (王鑫然), Xiao-shuai Huo  (霍小帅), Hong-rui Gao  (高鸿瑞) & Gao-peng Liang  (粱高鹏)

  2. Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Central South University, Changsha, 410075, China

    Feng-yan Fang  (方丰彦), Tang-hong Liu  (刘堂红), Yu-tao Xia  (夏玉涛), Bin Xu  (许彬), Xin-ran Wang  (王鑫然), Xiao-shuai Huo  (霍小帅), Hong-rui Gao  (高鸿瑞) & Gao-peng Liang  (粱高鹏)

  3. National & Local Joint Engineering Research Centre of Safety Technology for Rail Vehicle, Central South University, Changsha, 410075, China

    Feng-yan Fang  (方丰彦), Tang-hong Liu  (刘堂红), Yu-tao Xia  (夏玉涛), Bin Xu  (许彬), Xin-ran Wang  (王鑫然), Xiao-shuai Huo  (霍小帅), Hong-rui Gao  (高鸿瑞) & Gao-peng Liang  (粱高鹏)

  4. School of Rail Transportation, Soochow University, Suzhou, 215131, China

    Wen-hui Li  (李文辉)

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Contributions

FANG Feng-yan processed the numerical data and wrote the original manuscript. LIU Tang-hong was responsible for supervising and reviewing the manuscript. XIA Yu-tao and XU Bin conducted the experimental validation and the literature review. WANG Xin-ran and HUO Xiao-shuai conducted data visualization. GAO Hong-rui and LIANG Gao-peng were responsible for reviewing and polishing the draft. LI Wen-hui provided the overarching research idea and edited the draft of the manuscript. All authors replied to reviewers’ comments and revised the final version.

Corresponding author

Correspondence to Wen-hui Li  (李文辉).

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Additional information

Foundation item: Project(2022RC3040) supported by the Science and Technology Innovation Program of Hunan Province, China; Project (51975591) supported by the National Natural Science Foundation of China; Project(K2021J041) supported by the Technology Research and Development Program of China Railway; Project(2023ZZTS0426) supported by the Fundamental Research Funds for the Central Universities, China

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Fang, Fy., Liu, Th., Xia, Yt. et al. Aerodynamic effects of trains circulating through a bifurcated tunnel. J. Cent. South Univ. 31, 1017–1031 (2024). https://doi.org/10.1007/s11771-024-5586-7

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