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Blade excitation by aerodynamic instabilities - A compressor blade study

Publication ,  Conference
Kielb Robert, E; Thomas Jeffrey, P; Barter John, W; Hall Kenneth, C
Published in: American Society of Mechanical Engineers, International Gas Turbine Institute, Turbo Expo (Publication) IGTI
2003

In this paper, we investigate non-synchronous vibrations (NSV) in turbomachinery, an aeromechanic phenomenon in which rotor blades are driven by a fluid dynamic instability. Unlike flutter, a self-excited vibration in which vibrating rotor blades and the resulting unsteady aerodynamic forces are mutually reinforcing, NSV is primarily a fluid dynamic instability that can cause large amplitude vibrations if the natural frequency of the instability is near the natural frequency of the rotor blade. In this paper, we present both experimental and computational data. Experimental data was obtained from a full size compressor rig where the instrumentation consisted of blade-mounted strain gages and case-mounted unsteady pressure transducers. The computational simulation used a three-dimensional Reynolds averaged Navier-Stokes (RANS) time accurate flow solver. The computational results suggest that the primary flow features of NSV are a coupled suction side vortex shedding and a tip flow instability. The simulation predicts a fluid dynamic instability frequency that is in reasonable agreement with the experimentally measured value.

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Published In

American Society of Mechanical Engineers, International Gas Turbine Institute, Turbo Expo (Publication) IGTI

Publication Date

2003

Volume

4

Start / End Page

399 / 406

Location

Atlanta, GA, United States
 

Citation

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Kielb Robert, E., Thomas Jeffrey, P., Barter John, W., & Hall Kenneth, C. (2003). Blade excitation by aerodynamic instabilities - A compressor blade study. In American Society of Mechanical Engineers, International Gas Turbine Institute, Turbo Expo (Publication) IGTI (Vol. 4, pp. 399–406). Atlanta, GA, United States.
Kielb Robert, E., P. Thomas Jeffrey, W. Barter John, and C. Hall Kenneth. “Blade excitation by aerodynamic instabilities - A compressor blade study.” In American Society of Mechanical Engineers, International Gas Turbine Institute, Turbo Expo (Publication) IGTI, 4:399–406, 2003.
Kielb Robert E, Thomas Jeffrey P, Barter John W, Hall Kenneth C. Blade excitation by aerodynamic instabilities - A compressor blade study. In: American Society of Mechanical Engineers, International Gas Turbine Institute, Turbo Expo (Publication) IGTI. 2003. p. 399–406.
Kielb Robert, E., et al. “Blade excitation by aerodynamic instabilities - A compressor blade study.” American Society of Mechanical Engineers, International Gas Turbine Institute, Turbo Expo (Publication) IGTI, vol. 4, 2003, pp. 399–406.
Kielb Robert E, Thomas Jeffrey P, Barter John W, Hall Kenneth C. Blade excitation by aerodynamic instabilities - A compressor blade study. American Society of Mechanical Engineers, International Gas Turbine Institute, Turbo Expo (Publication) IGTI. 2003. p. 399–406.

Published In

American Society of Mechanical Engineers, International Gas Turbine Institute, Turbo Expo (Publication) IGTI

Publication Date

2003

Volume

4

Start / End Page

399 / 406

Location

Atlanta, GA, United States