Computational Technology Resources - CCC

C.E.A. Reyes, E. Baratelli, D. Rocchi, G. Tomasini, M.I. Sánchez, M. Artano, "Aerodynamic Effects of Different Car Body Configurations in a Conventional Train under Crosswinds", in J. Pombo, (Editor), "Proceedings of the Fifth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 1, Paper 18.2, 2022, doi:10.4203/ccc.1.18.2

Keywords: train aerodynamics, crosswind, CWC, wind tunnel.

Abstract

Crosswind stability represents a continuous topic of research. For high-speed trains the regulations for crosswind assessment includes a set of Characteristic Wind Curves (CWC) given as reference limits that new trains need to be compliant with. On the other hand, for conventional trains, the European standards only supply guidelines lacking reference limits that train constructors can follow at the design phase of the vehicles. In this work, it is analysed how different roofs and underbodies designs of a conventional train impact the overall vehicle behaviour to cross winds. The tested train corresponds to a CAF vehicle with maximum speed of 200 km/h and the safety assessment to crosswind for different configurations has been evaluated following the procedure described by TSI and the European Standard. Aerodynamic coefficients were measured in wind tunnel tests at Politecnico di Milano, on a modular scaled model able to replicate the different aerodynamic configurations. CWC were computed using time-dependent multi-body simulations with “Chinese Hat” wind gust model. Results show that a fully covered roof with respect to a standard open configuration, could lead to an improvement, in terms of characteristic wind speed at 90°, higher than 5 m/s. Finally, the comparison of CWCs obtained for the conventional train with the CWC of ICE3 high-speed train confirms the necessity of defining reference limits also for low-speed trains.

download the full-text of this paper (PDF, 812 Kb)

go to the previous paper
go to the next paper
return to the table of contents
return to the volume description

	Computational & Technology Resources an online resource for computational, engineering & technology publications
	not logged in - login
Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 1 PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 18.2 Aerodynamic Effects of Different Car Body Configurations in a Conventional Train under Crosswinds C.E.A. Reyes¹, E. Baratelli¹, D. Rocchi¹, G. Tomasini¹, M.I. Sánchez² and M. Artano² ¹Politecnico di Milano, Milan, Italy ²Construcciones y Auxiliar de Ferrocarriles, Beasain, Spain doi:10.4203/ccc.1.18.2 Full Bibliographic Reference for this paper C.E.A. Reyes, E. Baratelli, D. Rocchi, G. Tomasini, M.I. Sánchez, M. Artano, "Aerodynamic Effects of Different Car Body Configurations in a Conventional Train under Crosswinds", in J. Pombo, (Editor), "Proceedings of the Fifth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 1, Paper 18.2, 2022, doi:10.4203/ccc.1.18.2 Keywords: train aerodynamics, crosswind, CWC, wind tunnel. Abstract Crosswind stability represents a continuous topic of research. For high-speed trains the regulations for crosswind assessment includes a set of Characteristic Wind Curves (CWC) given as reference limits that new trains need to be compliant with. On the other hand, for conventional trains, the European standards only supply guidelines lacking reference limits that train constructors can follow at the design phase of the vehicles. In this work, it is analysed how different roofs and underbodies designs of a conventional train impact the overall vehicle behaviour to cross winds. The tested train corresponds to a CAF vehicle with maximum speed of 200 km/h and the safety assessment to crosswind for different configurations has been evaluated following the procedure described by TSI and the European Standard. Aerodynamic coefficients were measured in wind tunnel tests at Politecnico di Milano, on a modular scaled model able to replicate the different aerodynamic configurations. CWC were computed using time-dependent multi-body simulations with “Chinese Hat” wind gust model. Results show that a fully covered roof with respect to a standard open configuration, could lead to an improvement, in terms of characteristic wind speed at 90°, higher than 5 m/s. Finally, the comparison of CWCs obtained for the conventional train with the CWC of ICE3 high-speed train confirms the necessity of defining reference limits also for low-speed trains. download the full-text of this paper (PDF, 812 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
Back to top	©Civil-Comp Limited 2023 - terms & conditions