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Flutter Generation and Control Using Mistuning in a Turbine Rotating Rig

[+] Author Affiliations
Roque Corral

Industria de Turbo Propulsores S.A., Madrid, Spain

Josu Beloki

Centro de Tecnologias Aeronauticas, Zamudio, Spain

Paolo Calza

Avio Aero, Torino, Italy

Robert Elliot

Coquetdale Engineering Consultancy Ltd., Derby, UK

Paper No. GT2016-57949, pp. V07BT34A026; 17 pages
doi:10.1115/GT2016-57949
From:
  • ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
  • Volume 7B: Structures and Dynamics
  • Seoul, South Korea, June 13–17, 2016
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4984-2
  • Copyright © 2016 by ASME

abstract

The paper describes a free-flutter experiment on a stand-alone low-pressure turbine bladed rotor in a high-speed rotating wind tunnel together with the most relevant design decisions and solutions obtained for a low-reduced frequency cantilever shrouded rotor blade design. The test rotor underwent an experimental campaign with independent control of the shaft speed, pressure ratio and air density levels. Measurements were obtained entirely by means of non-intrusive techniques such as blade tip timing optical probes, and unsteady pressure transducers located in the outer casing of the rig downstream of the rotor. The bladed rotor was designed to flutter under a wide range of operating conditions. The independent effects of the shaft speed and the air density level were thoroughly investigated. It was concluded that, firstly, the higher the density level the higher the level of instability and, secondly, that the vibration amplitude of the rotor blade exhibits a maximum with the shaft speed.

In addition the rotor blades were designed in such a way that additional masses could be mounted in the tip-shrouds to create arbitrary mistuning patterns. Two different mistuning patterns were tested, the first consisted of a classical alternate mistuning pattern designed to suppress flutter whereas a second pattern was designed to halve the vibration amplitude of the tuned bladed-disk. Both objectives were successfully achieved during the experiment.

Copyright © 2016 by ASME

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