Considering both a radial turbine rotor of a turbocharger and an axial compressor test blisk at rest, aerodynamic damping characteristics are experimentally and numerically analyzed. Linear dependencies of modal damping ratios on the ambient pressure or the acoustic impedance, respectively, could be shown within experiments carried out inside a pressure chamber. The impact of the ambient air clearly dominates the modal damping ratios compared to the minor contribution of the structure. Assuming that acoustic emission can be regarded as main source of aerodynamic damping a simplified approach for its determination is introduced which only depends on natural frequency, mode shape and acoustic impedance. It is shown that a satisfying match between experiment and computation is achieved for those cases which are dedicated to sufficiently small ratios between wave lengths of acoustic emissions and blade distances.
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ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
June 13–17, 2016
Seoul, South Korea
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4984-2
PROCEEDINGS PAPER
Simplified Determination of Aerodynamic Damping for Bladed Rotors: Part 1 — Experimental Validation at Rest
Bernd Beirow,
Bernd Beirow
Brandenburg University of Technology, Cottbus, Germany
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Thomas Maywald,
Thomas Maywald
Brandenburg University of Technology, Cottbus, Germany
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Felix Figaschewsky,
Felix Figaschewsky
Brandenburg University of Technology, Cottbus, Germany
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Christoph Rocky Heinrich,
Christoph Rocky Heinrich
Brandenburg University of Technology, Cottbus, Germany
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Arnold Kühhorn,
Arnold Kühhorn
Brandenburg University of Technology, Cottbus, Germany
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Thomas Giersch
Thomas Giersch
Rolls-Royce Deutschland Ltd & Co KG, Blankenfelde-Mahlow, Germany
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Bernd Beirow
Brandenburg University of Technology, Cottbus, Germany
Thomas Maywald
Brandenburg University of Technology, Cottbus, Germany
Felix Figaschewsky
Brandenburg University of Technology, Cottbus, Germany
Christoph Rocky Heinrich
Brandenburg University of Technology, Cottbus, Germany
Arnold Kühhorn
Brandenburg University of Technology, Cottbus, Germany
Thomas Giersch
Rolls-Royce Deutschland Ltd & Co KG, Blankenfelde-Mahlow, Germany
Paper No:
GT2016-56535, V07BT34A007; 10 pages
Published Online:
September 20, 2016
Citation
Beirow, B, Maywald, T, Figaschewsky, F, Heinrich, CR, Kühhorn, A, & Giersch, T. "Simplified Determination of Aerodynamic Damping for Bladed Rotors: Part 1 — Experimental Validation at Rest." Proceedings of the ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. Volume 7B: Structures and Dynamics. Seoul, South Korea. June 13–17, 2016. V07BT34A007. ASME. https://doi.org/10.1115/GT2016-56535
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