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Reynolds number effects in combustion noiseAcoustic emission spectra have been obtained for non-premixed turbulent combustion from two small diameter laboratory gas burners, two commercial gas burners and a large gas burner in the firebox of a Babcock-Wilcox Boiler (50,000 lb steam/hr). The changes in burner size and firing rate represent changes in Reynolds number and changes in air/fuel ratio represent departure from stoichiometric proportions. The combustion efficiency was measured independently through gas analysis. The acoustic spectra obtained from the various burners exhibit a persistent shape over the Reynolds number range of 8200-82,000. The spectra were analyzed for identification of a predictable frequency domain that is most responsive to, and readily correlated with, combustion efficiency. A simple parameter (consisting of the ratio of the average acoustic power output in the most responsive frequency bandwidth to the acoustic power level of the loudest frequency) is proposed whose value increases significantly and unmistakably as combustion efficiency approaches 100%. The dependence of the most responsive frequency domain on the various Reynolds numbers associated with turbulent jets is discussed.
Document ID
19810065335
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Seshan, P. K.
(California Institute of Technology, Jet Propulsion Laboratory, Chemical and Biological Processes Section, Pasadena CA, United States)
Date Acquired
August 11, 2013
Publication Date
October 1, 1981
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
AIAA PAPER 81-2055
Meeting Information
Meeting: Aeroacoustics Conference
Location: Palo Alto, CA
Start Date: October 5, 1981
End Date: October 7, 1981
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
81A49739
Distribution Limits
Public
Copyright
Other

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