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A thermal analysis of a new railway brake concept using liquid cooling

type de publication      article in an international journal with refereeing comitee
date de publication 2004
auteur(s) Cartigny F.; Dufrenoy Philippe; Desmet Bernard
journal Proceedings of the I MECH E Part F Journal of Rail and Rapid Transit
volume (numéro) 218 (2)
pages 79 – 88
résumé The aim of this study is to evaluate the performances of the energy dissipation of a new railway disc brake concept, intended for an urban exploitation. Because of the increase in the rates of trains and subways as well as the number of passengers, brakes have become increasingly a major safety component. In urban exploitation, these systems are subjected to multiple braking actions and have operational limits. A new concept based on a liquid-cooled system is suggested to decrease the energy storage in the disc. A numerical model of this new concept was realized and its performances were estimated by comparing temperature evolution at the friction interface with that obtained with the classical brake. The temperatures reached on a single stop with the cooled concept are higher than those of a classical brake. However, an important temperature decrease is observed at the end of braking so that, for successive brakings, the liquid-cooling principle causes an overall decrease in temperature. Moreover, the use of a material with a high thermal effusivity increases the part of the flow generated at the interface transmitted to the pad and thus reduces the surface temperature.
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