Use of symbol statistics to characterize combustion in a pulse combustor operating near the fuel-lean limit

K.D. Edwards, C.E.A. Finney, K. Nguyen
University of Tennessee
Knoxville TN 37996-2210

C.S. Daw
Oak Ridge National Laboratory
Knoxville TN 37932-6472

We apply symbol-sequence analysis to pulse-combustor oscillations to characterize the onset of instabilities near the fuel-lean limit. Using data from a laboratory combustor, we demonstrate that such techniques can be very useful for finding and classifying complex pressure patterns which can be precursors to misfires and flameout. On-line diagnosis of these instabilities could facilitate active control for modulating the pressure pulses or extending the lean limit.

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Updated: 2001-05-10 ceaf