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Vortex/Flame Interactions in Microgravity Pulsed Jet Diffusion FlamesThe problem of vortex/flame interaction is of fundamental importance to turbulent combustion. These interactions have been studied in normal gravity. It was found that due to the interactions between the imposed disturbances and buoyancy induced instabilities, several overall length scales dominated the flame. The problem of multiple scales does not exist in microgravity for a pulsed laminar flame, since there are no buoyancy induced instabilities. The absence of buoyant convection therefore provides an environment to study the role of vortices interacting with flames in a controlled manner. There are strong similarities between imposed and naturally occurring perturbations, since both can be described by the same spatial instability theory. Hence, imposing a harmonic disturbance on a microgravity laminar flame creates effects similar to those occurring naturally in transitional/turbulent diffusion flames observed in microgravity. In this study, controlled, large-scale, axisymmetric vortices are imposed on a microgravity laminar diffusion flame. The experimental results and predictions from a numerical model of transient jet diffusion flames are presented and the characteristics of pulsed flame are described.
Document ID
19990054024
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Bahadori, M. Y.
(Science and Technology Development Corp. Los Angeles, CA United States)
Hegde, U.
(National Center for Microgravity Research on Fluids and Combustion Cleveland, OH United States)
Stocker, D. P.
(NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
August 19, 2013
Publication Date
May 1, 1999
Publication Information
Publication: Fifth International Microgravity Combustion Workshop
Subject Category
Materials Processing
Funding Number(s)
CONTRACT_GRANT: NCC3-544
CONTRACT_GRANT: NAS3-98031
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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