Gust wind tunnel study on ballast pick-up by high-speed trains |
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Authors: | F. Navarro-Medina A. Sanz-Andres I. Perez-Grande |
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Affiliation: | (1) Instituto Universitario de Microgravedad ‘Ignacio da Riva’, Universidad Polit?cnica de Madrid (IDR/UPM), ETSI Aeron?uticos, Plaza del Cardenal Cisneros, 3, 28040 Madrid, Spain |
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Abstract: | This paper describes the experimental setup, procedure, and results obtained, concerning the dynamics of a body lying on a floor, attached to a hinge, and exposed to an unsteady flow, which is a model of the initiation of rotational motion of ballast stones due to the wind generated by the passing of a high-speed train. The idea is to obtain experimental data to support the theoretical model developed in Sanz-Andres and Navarro-Medina (J Wind Eng Ind Aerodyn 98, 772–783, (2010), aimed at analyzing the initial phase of the ballast train-induced-wind erosion (BATIWE) phenomenon. The experimental setup is based on an open circuit, closed test section, low-speed wind tunnel, with a new sinusoidal gust generator mechanism concept, designed and built at the IDR/UPM. The tunnel’s main characteristic is the ability to generate a flow with a uniform velocity profile and sinusoidal time fluctuation of the speed. Experimental results and theoretical model predictions are in good agreement. |
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