Aerodynamic effects of trains circulating through a bifurcated tunnel
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.
high-speed trainbifurcated tunneltransient pressureaerodynamic force
方丰彦、刘堂红、夏玉涛、许彬、王鑫然、霍小帅、高鸿瑞、粱高鹏、李文辉
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Key Laboratory of Traffic Safety on Track of Ministry of Education,School of Traffic&Transportation Engineering,Central South University,Changsha 410075,China
Joint International Research Laboratory of Key Technology for Rail Traffic Safety,Central South University,Changsha 410075,China
National&Local Joint Engineering Research Centre of Safety Technology for Rail Vehicle,Central South University,Changsha 410075,China
School of Rail Transportation,Soochow University,Suzhou 215131,China
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高速列车 分岔隧道 瞬态压力波 气动力
Science and Technology Innovation Program of Hunan Province,China国家自然科学基金Technology Research and Development Program of China Railway中央高校基本科研业务费专项
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