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Experimental Research Into Aerodynamic Forces Leading to Self-Excited Vibrations of Turbine Rotors

[+] Author Affiliations
Krzysztof Kosowski, Marian Piwowarski

Technical University of Gdansk, Gdańsk, Poland

Paper No. GT2002-30638, pp. 1187-1195; 9 pages
doi:10.1115/GT2002-30638
From:
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2002, Parts A and B
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3609-6 | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME

abstract

The experimental investigation into pressure field in the shroud clearance and rotor trajectory were performed on an one-stage air model turbine of impulse type. Basing on the pressure distribution, the aerodynamic forces and moments were investigated as a function of rotor eccentricity, axial gap, rotor-stator misalignment, rotor speed and turbine load. We obtained the following results: 1. confirmation of the linear correlation between the rotor eccentricity (or rotor-stator misalignment angle) and aerodynamic forces, 2. proof that radial eccentricity influences the average location of the rotor, while the general shape of rotor trajectory remains unchanged, 3. proof that although the axial component of the pressure force is relatively low, the moments exerted by this force should be take into account when total aerodynamic moments are determined.

Copyright © 2002 by ASME

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