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Turbulent eddy diffusivity and mean eddy lifetimes measured in spray combustionA quantitative description of the eddy structure that occurs in turbulent combustion processes can be obtained by the use of laser velocimetry, as shown in this work. The mean eddy length scales, eddy lifetimes, and turbulent diffusivity have been determined in a spray combustion flame for the first time. Velocity data was obtained at various locations within the flame, and standard correlation techniques were modified and then applied to reduce the data. In order to assess how the spray burns, the measured eddy lifetimes were compared with the relevant reaction times and drop lifetimes. Conditions that are conducive to group combustion of the droplets, rather than individual droplet combustion, were found to exist in the upstream region of the spray. Local measurements of the hydrocarbon concentration also support the conclusion that the majority of droplets undergo group combustion. However, the data indicate that some of the larger drops can survive the initial burning region and form a dilute spray downstream where conditions favor individual droplet combustion.
Document ID
19800049226
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Driscoll, J. F.
(Michigan Univ. Ann Arbor, MI, United States)
Pelaccio, D. G.
(Michigan, University Ann Arbor, Mich., United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1980
Publication Information
Publication: Combustion Science and Technology
Volume: 21
Issue: 5-6,
Subject Category
Inorganic And Physical Chemistry
Accession Number
80A33396
Funding Number(s)
CONTRACT_GRANT: NSG-3148
Distribution Limits
Public
Copyright
Other

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