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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Höss, B. Leinhos, D. Fottner, L. |
| Copyright Year | 1998 |
| Abstract | Compressor flow instabilities have been the subject of a great number of investigations during the past decade. While most of this research work was done on isolated test-rig compressors this paper presents stall inception measurements in the compressor system of a two-spool turbofan engine at various power settings. Several analysing techniques such as temporal low-pass and band-pass filtering, temporal and spatial Fourier transforms including power-spectral-density calculations of the spatial coefficients and a wavelet analysing technique are applied. For the low pressure compressor three different types of stall inception processes were observed depending on the rotor speed. At low-speed stall originates from spike-type precursors, while long wavy pressure fluctuations corresponding to modal waves were observed prior to stall at mid-speed for undistorted inlet flow. At high-speed the rotor shaft unbalancing dominates the stall inception process as an external forcing function. In the case of distorted inlet flow spike-type stall inception behavior dominates throughout the speed range. While filtering and the Fourier spectra give a good insight into the physical background of the stall inception process (but with a very short warning time), the wavelet transform indicates the approach of the stalling process a few hundred rotor revolutions in advance independendy of the type of precursor. Setting up a reliable stall avoidance control based on this analysis scheme seems to be promising. |
| Sponsorship | International Gas Turbine Institute |
| File Format | |
| ISBN | 9780791878620 |
| DOI | 10.1115/98-GT-475 |
| Volume Number | Volume 1: Turbomachinery |
| Conference Proceedings | ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition |
| Language | English |
| Publisher Date | 1998-06-02 |
| Publisher Place | Stockholm, Sweden |
| Access Restriction | Open |
| Subject Keyword | Wavelet transforms Fourier transforms Filtration Stall inception Rotors Compressors Flow (dynamics) Pressure Density Waves Engines Wavelets Spectra (spectroscopy) Turbofans Fluctuations (physics) Flow instability |
| Content Type | Text |
| Resource Type | Article |
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