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

[+] Author Affiliations
Hidekazu Kodama

Ishikawajima-Harima Heavy Industries, Tokyo, Japan

Masanobu Namba

Kyushu University, Fukuoka, Japan

Paper No. 91-GT-178, pp. V005T14A027; 12 pages
doi:10.1115/91-GT-178
From:
  • ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award; General
  • Orlando, Florida, USA, June 3–6, 1991
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7902-3
  • Copyright © 1991 by ASME

abstract

A lifting surface theory is developed to predict the unsteady three-dimensional aerodynamic characteristics for a rotating transonic annular cascade of swept blades. An improved 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, in the case of transonic rotors, the magnitude of total aerodynamic work due to the blade vibration is reduced at large sweep angles, however blade sweep is not beneficial for noise reduction.

Copyright © 1991 by ASME
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