Stall precursor determination of an LM-2500 gas turbine
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Authors
Dahl, Gustave C.
Subjects
Advisors
Millsaps, Knox
Date of Issue
2007-06
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
This thesis presents an analysis of data taken from several stall initiation events for an LM-2500 gas turbine engine. Specifically, the time series of three separate pressure signals located at stages 3, 6, and 15 were analyzed utilizing fast Fourier transform, power spectral density, and an autocorrelation technique to determine the best and most reliable indicator to stall. The spectral analyses performed showed that rotating precursor waves that travel at approximately half rotor speed were the best indicators. Several algorithms were used and it was determined that stall wave perturbations can be identified reliable about 880 revolutions prior to the stall. This work indicates that a single pressure signal located at stage 3 on an LM-2500 gas turbine can be used to give advance warning to a stall more than 2 seconds prior to the stall event.
Type
Thesis
Description
Series/Report No
Department
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
xiv, 69 p. : ill. ;
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.