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Effects of Transducer Installation on Unsteady Pressure Measurements on Oscillating Blades

[+] Author Affiliations
J. Lepicovsky

NASA Glenn Research Center, Cleveland, OH

Paper No. GT2005-69000, pp. 793-803; 11 pages
doi:10.1115/GT2005-69000
From:
  • ASME Turbo Expo 2005: Power for Land, Sea, and Air
  • Volume 1: Turbo Expo 2005
  • Reno, Nevada, USA, June 6–9, 2005
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4699-7 | eISBN: 0-7918-3754-8
  • Copyright © 2005 by ASME

abstract

Unsteady pressures were measured above the suction side of a blade that was oscillated to simulate blade stall flutter. Measurements were made at blade oscillation frequencies up to 500 Hz. Two types of miniature pressure transducers were used: surface-mounted flat custom-made, and commercial miniature, body-mounted transducers. The signals of the surface-mounted transducers are significantly affected by blade acceleration, whereas the signals of body-mounted transducers are practically free of this distortion. A procedure was introduced to correct the signals of surface-mounted transducers to rectify the signal distortion due to blade acceleration. The signals from body-mounted transducers, and corrected signals from surface-mounted transducers represent true unsteady pressure signals on the surface of a blade subjected to forced oscillations. However, the use of body-mounted commercial transducers is preferred for the following reasons: no signal corrections are needed for blade acceleration, the conventional transducers are noticeably less expensive than custom-made flat transducers, the survival rate of body-mounted transducers is much higher, and finally installation of body-mounted transducers does not disturb the blade surface of interest.

Copyright © 2005 by ASME

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