Simulation of the Effect of Altitude and Rotational Speed on Transient Temperatures of Rotating Components

Paper #:
  • 2017-01-0217

Published:
  • 2017-03-28
Abstract:
In this paper, an algorithm for transient thermal analysis of rotating components has been developed. The analysis considers the effect of a radiation from surrounding heat sources and convection by under-body airflow. The objective of this work is to determine the instantaneous temperature of the rotating element’s surface at different operating conditions. Experimental determination of these temperatures is possible though it is typically a challenging task, especially at high rotational speeds and high temperatures. The proposed model utilizes a modular approach to calculate the view factor between the radiation heat source and the rotating component. This approach can be extended to include any geometric layout and arrangement between the two surfaces. The view factors are dynamically evaluated at each time step during the simulation process. Analysis is conducted for city traffic conditions which are transient in nature, freeway driving followed by a hot soak and a grade driving condition. The presented approach combines the effect of rotational speed and the change in altitude on the predicted component temperature. Simulation results are compared against measured component temperatures at various rotational speeds and at various heat source temperatures.
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