This figure shows the amplitude spectra of the combustor pressure with the uncontrolled combustion instability. The combustion instability shows a peak in the spectra at about 530 Hz. The peak is at about 0.3 psi. The surrounding noise at other frequencies is at about 0.15 psi. The figure also shows the combustion instability amplitude spectra when being controlled by a model-based instability control method and by an adaptive phase-shifting control method. The peak using both control methods has been reduced to about 0.2 psi.
Last updated: June 25, 2003
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