NDLI: Acoustic control of combustion instabilities and emissions in a gas-turbine combustor

Content Provider	IEEE Xplore Digital Library
Author	Paschereit, C.O. Gutmark, E. Weisenstein, W.
Copyright Year	1998
Description	Author affiliation: ABB Corp. Res. Ltd., Baden, Switzerland (Paschereit, C.O.)
Abstract	Unstable thermoacoustic modes were investigated and controlled in an experimental low-emission swirl stabilized combustor, in which the acoustic boundary conditions were modified to obtain combustion instability. The swirl stabilized combustor was operated in premixed mode as well as with a diffusion type flame. A closed loop active control system was employed to suppress the thermoacoustic pressure oscillations and to reduce NOx emissions. Microphone and OH emission detection sensors mere utilized to monitor the combustion process and provide input to the control system. An acoustic actuation was utilized to modulate the air flow and thus affecting the mixing process and the combustion. Suppression levels of up to 5 dB in the pressure oscillations and a concomitant reduction of NOx emissions were obtained using an acoustic power of less than 0.002% of the combustor power. It was shown that the control system reduced the coherence of the vortical structures which gave rise to the thermoacoustic instability.
Starting Page	1175
Ending Page	1179
File Size	711391
Page Count	5
File Format	PDF
ISBN	078034104X
DOI	10.1109/CCA.1998.721644
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-09-04
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Acoustic emission Combustion Control systems Boundary conditions Fires Pressure control Microphones Acoustic signal detection Sensor systems Acoustic sensors
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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