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TECHNICAL PAPERS

Stall Inception in the Compressor System of a Turbofan Engine

[+] Author and Article Information
Bernd Höss, Dirk Leinhos, Leonhard Fottner

Institut für Strahlantriebe, Universität der Bundeswehr München, D-85577 Neubiberg, Germany

J. Turbomach 122(1), 32-44 (Feb 01, 1998) (13 pages) doi:10.1115/1.555425 History: Received February 01, 1998
Copyright © 2000 by ASME
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References

Figures

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LARZAC 04 C5 test engine
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Low-frequency instrumentation positions
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Positions of miniature pressure transducers
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Time-frequency resolution for (a) Fourier transform and (b) wavelet transform
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Magnitude plot of wavelet transform
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LP compressor characteristics
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LPC stage characteristics: (a) Stage 1, (b) Stage 2
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Pressure signals during stall inception at (a) 54 percent of these LPC rotor speed, (b) 78 percent rotor speed, (c) 90 percent rotor speed
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Temporal Fourier spectrum and band-pass filtered time domain signals at 54, 78, and 90 percent corresponding rotor speed
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Spatial Fourier coefficients at 54, 78, and 90 percent corresponding rotor speed
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PSD and TWE of the spatial Fourier coefficients at 54, 78, and 90 percent corresponding rotor speed
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Wavelet transform and statistical evaluation of the amplitude variations
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Spatial Fourier transform of low-pass filtered and unfiltered data at 86 percent rotor speed
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Low-pass filtered pressure signals and temporal Fourier transform at 84 percent rotor speed with 90 deg total pressure inlet distortion
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Statistical evaluation of wavelet transform coefficient for static pressure signal at LPC inlet with total pressure inlet flow distortion

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