Improvement of Tread brake Heat Dissipation Using Forced Air Cooling
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Date
2015-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Sufficient heat dissipation is crucial to the effective operation of friction based braking
systems. Such cooling is generally provided by ensuring a sufficient supply of cooling air to
the heated components, hence the aerodynamics in the region of the brake components is
extremely important. The objective of the research was to develop an understanding of how
forced air vented from the brake pipe and main reserviore could be used to improve the
cooling of train tread brake.
The thermal analyses of tread brake during emergency braking at a speed of 100 km/h considering
forced
air
cooling
were
investigated
using
finite
element
(FE)
and
computational
fluid
dynamics (CFD) methods. The results suggested that the higher convection coefficients
achieved with forced air cooling will not only reduce the maximum temperature in the braking
but
also
reduce
the
thermal
gradients,
since
heat
will
be
removed
faster
from hotter parts
of the tread brake.
Forced air cooling should be effective to reduce the risk of hot spot formation and tread
wheel thermal distortion. The highest temperature after emergency braking was 432.43 °C
and 412.75 °C , 399.13 °C and 384.81°C without and with considering forced air cooling
with velocities of (50,100 and 150 m/s) , respectively. The main purpose of this study is to
improve the heat dissipation of tread brake by using forced air cooling from the brake pipe
and main reservoir.
Description
Keywords
heat dissipation, convection heat transfer coefficient, temperature, total heat flux and CFD (computational fluid dynamics)