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

Abstract

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.

Keywords

disc brake surface temperature liquid cooling

Get full access to this article

View all access options for this article.

References

Gregorig

Échangeurs de Chaleur, 1965 (Librairie Polytechnique Béranger, Paris).

Day

A. J.

The dissipation of frictional energy from the interface of an annular disc brake

Proc. Instn Mech. Engrs, Part D: J. Automobile Engineering, 1984, 198 (D11), 201–209.

Watel

Harmand

Desmet

Influence of convective heat exchange on a rotating disc in super-imposed air flow—comparison between heat pipe and solid discs

Enhanced Heat Transfer, 2000, 7, 259–272.

Scaring

R. P.

T. L.

Peterson

M. B.

The design of aircraft brake system, employing cooling to increase brake life. NASA Report CR134980, October 1975.

Kays

W. M.

Bjorklund

I. S.

Heat transfer from a rotating cylinder with or without crossflow

Trans. ASME, 1958, 80, 70–78.

Dufrénoy

Weichert

Prediction of railway disc brake temperatures taking the bearing surface variations into account

Proc. Instn Mech. Engrs, Part F: J. Rail and Rapid Transit, 1995, 209 (F2), 67–76.

Boiteux

Christians

Les équipements de freinage des futures rames TGV-Atlantique

Rev. Gén. Chemins Fer, 1987, 9, 7–20.

Tanvir

M. A.

Du refroidissement des disques de frein de train

Rail Int., March 1988, 37–42.

Kreith

Principles of Heat Transfer, 3rd edition, 1973 (Intex Educational Publishers, A Dun-Donnelley Publisher, New York).

10.

Newcomb

T. P.

Transient temperatures attained in disk brakes

Br. J. Appl. Phys., 1959, 10, 339–340.

11.

Kubota

Hamabe

Nakazono

Fukuda

Doi

Development of a lightweight brake disc rotor: A design approach for achieving an optimum thermal, vibration, weight balance

JSAE Rev., 2000, 21, 349–355.

12.

Jackson

J. D.

Al-Khatani

S. A.

Investigation of heat transfer from an imposed axial flow of air to a rotating disk. In Eurotherm Seminar 46, Heat Transfer in Single Phase Flow 4, University of Pisa, Italy, 1995, pp. 123–130.