Work presented in this paper has been devoted to understanding the airflow and the subsequent heat transfer properties from a CV anti-coning brake disc during a stationary parking application. CFD analysis was conducted and validated against measured temperatures as air speeds are too low to measure accurately. It was shown that the modelling process of stationary applications is far more complex than for dynamic applications. Computational times are extensive due to the quantity of elements needed to deliver accurate results without a forced flow. The SST turbulence model was also shown to be the most suitable for matching CFD predictions to measured data, although laminar predictions were reasonable too. Exiting airflow at the ID from the lower vanes has been shown to obstruct the external airflow and prevent it from entering the ID for the upper disc section. A low air volume within the channels reduces the flow energy, resulting in recirculation regions forming towards the OD of the middle vanes, which also blocks air entry to the channels. Consequently, the heat transfer from the upper vanes is significantly reduced. Distribution of the heat transfer coefficient from the surfaces has been shown to be relatively evenly distributed across the friction surfaces, with hconv remaining close to 11W/m2K. Upper hconv channel values reached only 3 W/m2K, with vanes housing dual recirculation regions providing negligible convective cooling. Future work will contain the presence of the wheel and caliper parts, including the pads, as the influence of conduction and radiation modes increases.
Heat transfer from commercial vehicle brake disc assemblies in parked conditions
2012
19 Seiten, 10 Bilder, 9 Quellen
Conference paper
Storage medium
English
Heat transfer from commercial vehicle brake disc assemblies in parked conditions
Automotive engineering | 2012
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