Vibrations and Stability of Turbine Blades at Stall

[+] Author and Article Information
R. Pigott

Technology Development, Large Steam Turbine Division, Westinghouse Electric Corporation, Philadelphia, Pa.

J. M. Abel

Towne School of Civil and Mechanical Engineering, University of Pennsylvania, Philadelphia, Pa.

J. Eng. Power 96(3), 201-208 (Jul 01, 1974) (8 pages) doi:10.1115/1.3445794 History: Received September 15, 1972; Online July 14, 2010


A method is given for analyzing the vibrations of turbine blades subjected to flows at high negative incidence angles. The conditions for the existence of self-excited vibrations and the stability of these vibrations are derived for free-standing or grouped blades which are of tapered and twisted form. The technique given extends the analysis of Sisto [1] to the case in which any mode of vibration may be considered and in which the aerodynamic forces and moments taken on a quasi-steady basis are functions of Mach number as well as instantaneous angle of attack. Results are given for a group of four lashed blades and some experimentally observed behavior is reported.

Copyright © 1974 by ASME
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