Lyons, O.F.P., Murray, D.B. and Torrance, A.A.,, Air jet cooling of brake discs, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 222, 6, 2008, 995-1004
222 6 Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
This paper reports on an investigation of a novel approach to the cooling of brake discs,
based on the application of impinging air jets. This has the capacity to enhance the heat
transfer coefficients at the disc surface quite considerably without affecting the disc design,
so that the disc construction may then be optimized without reference to heat transfer. Using
a purpose built test-rig, disc temperature histories were recorded using IR thermography for
varying jet air flow rates, angle of impingement, dimensionless distance from the brake disc
and rotational speed. As well as comparing cooling effectiveness for different test parameters,
convective heat transfer coefficients were calculated from the transient temperature data and
were used as boundary conditions for a finite element model of the process. The results
obtained from this investigation suggest that the higher convection coefficients achieved with
jet cooling will not only reduce the maximum temperature in the braking cycle but will
reduce thermal gradients, since heat will be removed faster from hotter parts of the disc. Jet
cooling should therefore be effective to reduce the risk of hot spot formation and associated
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