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D. Luo¹, T. Wang^1,2,3, Y. Wang¹ and Y. Feng^1,4

¹School of Traffic and Transportation Engineering, Central South University, Hunan, China
²College of Future Technology, Hunan University, China
³College of Mechanical and Vehicle Engineering, Hunan University, China
⁴, CRRC Qingdao Sifang CO., LTD., Shandong, China

doi:10.4203/ccc.15.5.8

D. Luo, T. Wang, Y. Wang, Y. Feng, "A Study on the Aerodynamic Characteristics and Drag-Reduction Structural Optimisation of Inside-Axle-Box Bogies in High-Speed Trains", in J. Pombo, (Editor), "Proceedings of the Seventh International Conference on Railway Technology: Research, Development and Maintenance ", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 15, Paper 5.8, 2026, doi:10.4203/ccc.15.5.8

Keywords: high-speed trains, inside-axle-box bogies, fairings, aerodynamic drag reduction, numerical simulation, aerodynamic optimisation.

Abstract

The inside-axle-box bogie, as a novel bogie configuration, offers advantages in structural integration, spatial arrangement, and dynamic performance. However, its application to high-speed trains remains limited, and its aerodynamic characteristics and drag-reduction mechanisms are still unclear. Due to the complex geometry and exposed components in the bogie region, flow separation, local high-pressure concentration, and wake vortex evolution are easily induced, making this region a major source of underbody aerodynamic drag. In this study, a four-car high-speed train was investigated using models of the original bogie, a coupling fairing scheme, and a bottom fairing scheme. The aerodynamic drag, pressure field, and velocity field at different speeds were analysed to reveal the flow organisation and drag-reduction mechanisms in the inside-axle-box bogie region. The results showed that both fairing schemes improve the local flow structure, suppress flow separation and wake disturbance, and reduce the aerodynamic drag of both the bogie region and the entire train. The bottom fairing scheme exhibited more stable drag reduction, with a maximum drag-reduction rate of 12.4%. These findings provide provides theoretical support for the aerodynamic optimisation of high-speed trains with inside-axle-box bogies and the development of underbody drag-reduction structures.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 15 PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 5.8 A Study on the Aerodynamic Characteristics and Drag-Reduction Structural Optimisation of Inside-Axle-Box Bogies in High-Speed Trains D. Luo¹, T. Wang^1,2,3, Y. Wang¹ and Y. Feng^1,4 ¹School of Traffic and Transportation Engineering, Central South University, Hunan, China ²College of Future Technology, Hunan University, China ³College of Mechanical and Vehicle Engineering, Hunan University, China ⁴, CRRC Qingdao Sifang CO., LTD., Shandong, China doi:10.4203/ccc.15.5.8 Full Bibliographic Reference for this paper D. Luo, T. Wang, Y. Wang, Y. Feng, "A Study on the Aerodynamic Characteristics and Drag-Reduction Structural Optimisation of Inside-Axle-Box Bogies in High-Speed Trains", in J. Pombo, (Editor), "Proceedings of the Seventh International Conference on Railway Technology: Research, Development and Maintenance ", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 15, Paper 5.8, 2026, doi:10.4203/ccc.15.5.8 Keywords: high-speed trains, inside-axle-box bogies, fairings, aerodynamic drag reduction, numerical simulation, aerodynamic optimisation. Abstract The inside-axle-box bogie, as a novel bogie configuration, offers advantages in structural integration, spatial arrangement, and dynamic performance. However, its application to high-speed trains remains limited, and its aerodynamic characteristics and drag-reduction mechanisms are still unclear. Due to the complex geometry and exposed components in the bogie region, flow separation, local high-pressure concentration, and wake vortex evolution are easily induced, making this region a major source of underbody aerodynamic drag. In this study, a four-car high-speed train was investigated using models of the original bogie, a coupling fairing scheme, and a bottom fairing scheme. The aerodynamic drag, pressure field, and velocity field at different speeds were analysed to reveal the flow organisation and drag-reduction mechanisms in the inside-axle-box bogie region. The results showed that both fairing schemes improve the local flow structure, suppress flow separation and wake disturbance, and reduce the aerodynamic drag of both the bogie region and the entire train. The bottom fairing scheme exhibited more stable drag reduction, with a maximum drag-reduction rate of 12.4%. These findings provide provides theoretical support for the aerodynamic optimisation of high-speed trains with inside-axle-box bogies and the development of underbody drag-reduction structures. download the full-text of this paper (PDF, 14 pages, 1430 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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