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Physical understanding and sensitivities of low pressure turbine flutter

Publication ,  Journal Article
Waite, JJ; Kielb, RE
Published in: Journal of Engineering for Gas Turbines and Power
January 1, 2015

Successful, efficient turbine design requires a thorough understanding of the underlying physical phenomena. This paper investigates the flutter phenomenon of low pressure turbine (LPT) blades seen in aircraft engines and power turbines. Computational fluid dynamics (CFD) analysis will be conducted in a two-dimensional (2D) sense using a frequency domain Reynolds-averaged Navier-Stokes (RANS) solver on a publicly available LPT airfoil geometry: Ecole Polytechnique Federale De Lausanne (EPFL's) Standard Configuration 4. An emphasis is placed on revealing the underlying physics behind the threatening LPT flutter mechanism. To this end, flutter sensitivity analysis is conducted on three key parameters: reduced frequency, mode shape, and Mach number. Additionally, exact 2D acoustic resonance interblade phase angles (IBPAs) are analytically predicted as a function of reduced frequency. Made evident via damping versus IBPA plots, the CFD model successfully captures the theoretical acoustic resonance predictions. Studies of the decay of unsteady aerodynamic influence coefficients away from a reference blade are also presented. The influence coefficients provide key insights to the harmonic content of the unsteady pressure field. Finally, this work explores methods of normalizing the work per cycle by the exit dynamic pressure. Copyright © 2015 by ASME.

Duke Scholars

Published In

Journal of Engineering for Gas Turbines and Power

DOI

EISSN

1528-8919

ISSN

0742-4795

Publication Date

January 1, 2015

Volume

137

Issue

1

Related Subject Headings

  • Energy
  • 4004 Chemical engineering
  • 4001 Aerospace engineering
  • 0913 Mechanical Engineering
  • 0901 Aerospace Engineering
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Waite, J. J., & Kielb, R. E. (2015). Physical understanding and sensitivities of low pressure turbine flutter. Journal of Engineering for Gas Turbines and Power, 137(1). https://doi.org/10.1115/1.4028207
Waite, J. J., and R. E. Kielb. “Physical understanding and sensitivities of low pressure turbine flutter.” Journal of Engineering for Gas Turbines and Power 137, no. 1 (January 1, 2015). https://doi.org/10.1115/1.4028207.
Waite JJ, Kielb RE. Physical understanding and sensitivities of low pressure turbine flutter. Journal of Engineering for Gas Turbines and Power. 2015 Jan 1;137(1).
Waite, J. J., and R. E. Kielb. “Physical understanding and sensitivities of low pressure turbine flutter.” Journal of Engineering for Gas Turbines and Power, vol. 137, no. 1, Jan. 2015. Scopus, doi:10.1115/1.4028207.
Waite JJ, Kielb RE. Physical understanding and sensitivities of low pressure turbine flutter. Journal of Engineering for Gas Turbines and Power. 2015 Jan 1;137(1).

Published In

Journal of Engineering for Gas Turbines and Power

DOI

EISSN

1528-8919

ISSN

0742-4795

Publication Date

January 1, 2015

Volume

137

Issue

1

Related Subject Headings

  • Energy
  • 4004 Chemical engineering
  • 4001 Aerospace engineering
  • 0913 Mechanical Engineering
  • 0901 Aerospace Engineering