Unsteady Flow Calculation in a Vibrating Cascade and Aerodynamic Damping Prediction PUBLIC ACCESS

[+] Author Affiliations
D. Garreau, F. Tephany

Electricite De France, Chatou, France

Paper No. 85-GT-139, pp. V001T03A037; 9 pages
  • ASME 1985 International Gas Turbine Conference and Exhibit
  • Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery
  • Houston, Texas, USA, March 18–21, 1985
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7938-2
  • Copyright © 1985 by ASME


A numerical method has been developed for predicting the aerodynamic damping of the last L.P. stages in a 900 MW steam turbine on a blade to blade surface using a boundary element method. The results obtained on the first flexural mode of the blades for several displacements and for several interblade phase angles show no unstability of the rotor except perhaps for low phase angles. They also prove that quasisteady calculations are relevant for all the cases tested.

Copyright © 1985 by ASME
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