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Approximation of Critical Speeds for Shafts With Thermal Gradients Using a Rotating Heat Rig

[+] Author Affiliations
Michael Mixa, Ali P. Gordon

University of Central Florida, Orlando, FL

Paper No. GT2010-22522, pp. 147-155; 9 pages
doi:10.1115/GT2010-22522
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 6: Structures and Dynamics, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4401-4 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

The simulation of internal airflow within turbine blade cooling channels can be useful in understanding the interactions between the operating temperatures, the coolant flow and its effectiveness, and the angular velocity of the blade. A rotating heat rig was designed as a meso-scale testing device to help understand these relationships within the confines of a lab. The first phase of the device was the use of a tubular shaft specimen which was mounted in series with the axis of rotation of the rig. The pipe was externally heated with the use of NiCr resistive wire to simulate the operating temperatures of a turbine blade. The heating element and the rotation of the sample were controlled digitally. Important design considerations were made such as accurate temperature control, modal changes as a function of varying temperature, and accurate bearing life estimates. As a part of carrying out this research, it was determined that none of the analytical models from literature were capable of predicting the critical speed of a shaft with non-uniform temperature distribution. Models based on Rayleigh’s method, Dunkerley’s method, and finite element analysis were created to estimate the critical speeds of the device. The analytical model that was developed makes up for the short comings of existing approaches.

Copyright © 2010 by ASME

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