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- W2023391898 abstract "Unstable thermoacoustic modes were investigated and controlled in an experimental low-emission swirl-stabilized combustor. Axisymmetric and helical unstable modes were identified for fully premixed combustion. The spatiallocation of intense combustion regions associated with the different unstable modes was visualized by phase-locked images of OH chemiluminescence. The axisymmetric mode showed large variation of the heat release during one cycle, whereas the helical modes showed circumferential variations in the location of maximal heat release. An acoustic closed-loop proportional active control system was employed to suppress the thermoacoustic pressure oscillations and to reduce NO x emissions. Microphone sensors were utilized to monitor the combustion process and provide input to the control system. Acoustic actuation was utilized to modulate the airflow and affect the mixing process and the combustion processes. Equivalence ratio modulations were not employed in the present controller. Suppression in the pressure oscillation levels of over 12 dB, and a concomitant 10% reduction of NO x emissions were achieved using an acoustic power of less than 0.002% of the combustion power. The proportional controller was superior to a phase lag controller that yielded a maximum suppression of 4 dB at the same level of acoustic power. At the optimal control conditions it was shown that the major effect of the control system was to reduce the coherence of the vortical structures, which gave rise to the thermoacoustic instability." @default.
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- W2023391898 date "2002-11-01" @default.
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- W2023391898 title "Proportional Control of Combustion Instabilities in a Simulated Gas-Turbine Combustor" @default.
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- W2023391898 doi "https://doi.org/10.2514/2.6067" @default.
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