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Numerical Investigation of Tip Clearance Flow Induced Flutter in an Axial Research Compressor

[+] Author Affiliations
Daniel Möller, Maximilian Jüngst, Felix Holzinger, Christoph Brandstetter, Heinz-Peter Schiffer

Technische Universität Darmstadt, Darmstadt, Germany

Sebastian Leichtfuß

TurboScience GmbH, Darmstadt, Germany

Paper No. GT2016-56956, pp. V07BT34A010; 12 pages
doi:10.1115/GT2016-56956
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 Rolls-Royce Deutschland Ltd & Co KG

abstract

A flutter phenomenon was observed in a 1.5-stage configuration at the Darmstadt transonic compressor. This phenomenon is investigated numerically for different compressor speeds. The flutter occurs for the second eigenmode of the rotor blades and is caused by tip clearance flow which is able to pass through multiple rotor gaps at highly throttled operating points. The vibration pattern during flutter is accompanied by a pressure fluctuation pattern of the tip clearance flow which is interacting with the blade motion causing the aeroelastic instability. The velocity of the tip clearance flow fluctuation is about 50% of the blade tip speed for simulation and experiment and also matches the mean convective velocity inside the rotor gap. This is consistent for all compressor speeds. From this investigations, general guidelines are drawn which can be applied at an early stage during compressor design to evaluate the susceptibility to this kind of blade vibration.

Copyright © 2016 by Rolls-Royce Deutschland Ltd & Co KG

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