Effect of sector mode shape variation on the aerodynamic stability of a low-pressure turbine sectored vane


Conference Paper

The paper presents a method to investigate the flutter appearance in a cascade, where blades are connected together in a number of identical sectors. The key parameters of the method are vibration amplitudes and mode shapes of the blades belonging to the same sector. The aerodynamic response from a sectored vane cascade is calculated based on the aerodynamic work influence coefficients of freestanding blades performed with two-dimensional inviscid linearized flow solver. A case study based upon the presented methodology shows that, despite stabilizing effect of tying blades together into sectors, a sectored vane consisting of six low-pressure turbine blades vibrating with real single modes, and identical amplitudes can be unstable at realistic design conditions.

Full Text

Duke Authors

Cited Authors

  • Chernysheva, OV; Fransson, TH; Kielb, RE; Barter, J

Published Date

  • December 1, 2003

Published In

  • American Society of Mechanical Engineers, International Gas Turbine Institute, Turbo Expo (Publication) Igti

Volume / Issue

  • 4 /

Start / End Page

  • 389 - 398

Digital Object Identifier (DOI)

  • 10.1115/GT2003-38632

Citation Source

  • Scopus