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Rotating Pip Detection and Stall Warning in High-Speed Compressors Using Structure FunctionA statistic for both rotating pip and incipient stall detection, called Structure Function is introduced for use in high speed research compressor environments. Experimental studies on stall inception processes have long observed two types of pre-stall compressor activity. Presently there exist methods for indicating modal stall precursive events in the compressor. This is a first application of a new method to detect rotating pip activity prior to stall in research compressors. The algorithm requires a very short sample of data to distinguish pip activity prior to stall, and thus may be used in a real time application. Additionally, this Structure Function algorithm is also used as a single sensor stall warning method under a variety of operating conditions, including clean inlet conditions, radially and circumferentially distorted inlet conditions, and in examples of steady air injection along the casing, and controlled air injection conditions. Structure Function provides a potential advantage over linear spectral techniques and wavelet algorithms for stall detection due to the simplicity of the algorithm and because it does not rely on a priori knowledge of frequency content.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Bright, Michelle M.
(NASA Lewis Research Center Cleveland, OH United States)
Qammar, Helen
(Akron Univ. Akron, OH United States)
Vhora, Hanif
(Akron Univ. Akron, OH United States)
Schaffer, Michael
(Akron Univ. Akron, OH United States)
Date Acquired
August 19, 2013
Publication Date
February 1, 1999
Publication Information
Publication: Design Principles and Methods for Aircraft Gas Turbine Engines
Subject Category
Aircraft Propulsion And Power
Funding Number(s)
Distribution Limits
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