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Spectral structure of pressure measurements made in a combustion ductA model for acoustic plane wave propagation in a combustion duct through a confined, flowing gas containing soot particles is presented. The model takes into account only heat transfer between the gas and soot particles. As a result, the model depends on only a single parameter which can be written as the ratio of the soot particle thermal relaxation time to the soot particle mass fraction. The model yields expressions for the attenuation and dispersion of the plane wave which depends only on this single parameter. The model was used to calculate pressure spectra in a combustion duct. The results were compared with measured spectra. For particular values of the single free parameter, the calculated spectra resemble the measured spectra. Consequently, the model, to this extent, explains the experimental measurements and provides some insight into the number and type of particles.
Document ID
19800013558
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Miles, J. H. (NASA Lewis Research Center Cleveland, OH, United States)
Raftopoulos, D. D. (Toledo Univ.)
Date Acquired
September 4, 2013
Publication Date
January 1, 1980
Subject Category
Acoustics
Report/Patent Number
NASA-TM-81471
E-404
Meeting Information
Meeting: Meeting of the Acoust. Soc. of Am.
Location: Atlanta
Start Date: April 21, 1980
End Date: April 25, 1980
Accession Number
80N22045
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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