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Unsteady Lifting Surface Theory for a Rotating Cascade of Swept Blades PUBLIC ACCESS

[+] Author Affiliations
Hidekazu Kodama

Ishikawajima-Harima Heavy Industries, Tokyo, Japan

Masanobu Namba

Kyushu University, Fukuoka, Japan

Paper No. 89-GT-306, pp. V001T01A108; 9 pages
doi:10.1115/89-GT-306
From:
  • ASME 1989 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • Toronto, Ontario, Canada, June 4–8, 1989
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7913-9
  • Copyright © 1989 by ASME

abstract

A lifting surface theory is developed to predict the unsteady three-dimensional aerodynamic characteristics for a rotating subsonic annular cascade of swept blades. A discrete element method is used to solve the integral equation for the unsteady blade loading. Numerical examples are presented to demonstrate effects of the sweep on the blade flutter and on the acoustic field generated by interaction of rotating blades with a convected sinusoidal gust. It is found that increasing the sweep results in decrease of the aerodynamic work on vibrating blades and also remarkable reduction of the modal acoustic power of lower radial orders for both forward and backward sweeps.

Copyright © 1989 by ASME
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