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F. Carmona¹, I. Pereira² and J.M.C.S. André¹

¹Técnico, University of Lisbon, Lisboa, Portugal
²LNEC, Laboratrio Nacional de Engenharia Civil, Lisboa, Portugal

doi:10.4203/ccp.104.41

, "Numerical Study of Streamlined Trains", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 41, 2014. doi:10.4203/ccp.104.41

Keywords: train aerodynamics, ballast projection, optimization.

Summary

In very streamlined trains, most of the flow is potential and the boundary layer concept and local head losses may be useful design tools. This paper investigates the pressure distribution in the space between the underbelly of the train and the ballast. To represent with more realism the gap between the inner face of the lateral squirts of the train and the upper surface of the rails, a local head-loss model is used. The research applies only to trains at small incidence, which is usually the case of high-speed trains running at nominal velocity. The analysis of the flow underneath the train is of interest to explore the conditions under which some ballast stones become unstable during the passage of trains and can be projected against the underbelly of the train or towards the outside of the track.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 104 PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 41 Numerical Study of Streamlined Trains F. Carmona¹, I. Pereira² and J.M.C.S. André¹ ¹Técnico, University of Lisbon, Lisboa, Portugal ²LNEC, Laboratrio Nacional de Engenharia Civil, Lisboa, Portugal doi:10.4203/ccp.104.41 purchase the full-text of this paper Full Bibliographic Reference for this paper , "Numerical Study of Streamlined Trains", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 41, 2014. doi:10.4203/ccp.104.41 Keywords: train aerodynamics, ballast projection, optimization. Summary In very streamlined trains, most of the flow is potential and the boundary layer concept and local head losses may be useful design tools. This paper investigates the pressure distribution in the space between the underbelly of the train and the ballast. To represent with more realism the gap between the inner face of the lateral squirts of the train and the upper surface of the rails, a local head-loss model is used. The research applies only to trains at small incidence, which is usually the case of high-speed trains running at nominal velocity. The analysis of the flow underneath the train is of interest to explore the conditions under which some ballast stones become unstable during the passage of trains and can be projected against the underbelly of the train or towards the outside of the track. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £65 +P&P)
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