A Thermoacoustic Instability Precursor Based on the Acoustic Flux at the Combustion Chamber Inlet

The acoustic flux at the inlet of the combustion chamber is used to indicate the proximity to impending thermo-acoustic instabilities (TAI) in a swirled spray combustor. This acoustic power is integrated over all frequencies and is deduced from acoustic pressure and velocity measurements made upstre...

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Published in:Combustion science and technology 2023-10, Vol.195 (14), p.3357-3371
Main Authors: Morinière, T., Selle, L., Poinsot, T., Schuller, T.
Format: Article
Language:English
Subjects:
acoustic flux
Acoustic instability
Chemiluminescence
Combustion
Combustion chambers
Combustion instabilities
Engineering Sciences
Fluctuations
gas turbine engines
online monitoring
Parameter modification
Phase lag
Power spectral density
precursor
Precursors
Process parameters
swirl-spray flame
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container_title Combustion science and technology
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creator Morinière, T.
Selle, L.
Poinsot, T.
Schuller, T.
description The acoustic flux at the inlet of the combustion chamber is used to indicate the proximity to impending thermo-acoustic instabilities (TAI) in a swirled spray combustor. This acoustic power is integrated over all frequencies and is deduced from acoustic pressure and velocity measurements made upstream the combustion chamber. Results with this TAI precursor are compared to those obtained by considering the root mean square value of the acoustic pressure inside the combustion chamber, the peak of the power spectral density of the combustion chamber acoustic pressure and the phase lag between the acoustic pressure inside the chamber and the OH* chemiluminescence. It is demonstrated that the acoustic flux outperforms the other indicators in terms of order of magnitude change and shape evolution when approaching TAI while being relatively insensitive to signal processing parameter modifications.
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subjects acoustic flux
Acoustic instability
Chemiluminescence
Combustion
Combustion chambers
Combustion instabilities
Engineering Sciences
Fluctuations
gas turbine engines
online monitoring
Parameter modification
Phase lag
Power spectral density
precursor
Precursors
Process parameters
swirl-spray flame
title A Thermoacoustic Instability Precursor Based on the Acoustic Flux at the Combustion Chamber Inlet
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