Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/77625
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Title: Near-field flow stability of buoyant methane/air inverse diffusion flames
Authors: Zhu, X 
Xia, X 
Zhang, P 
Issue Date: May-2018
Source: Combustion and flame, May 2018, v. 191, p. 66-75
Abstract: Experiment and simulation were performed to investigate buoyant methane/air inverse diffusion flames, with emphasis on the near-field flow dynamics under non-reacting and reacting conditions. In the non-reacting flow, the initial shear flow and the buoyancy effect induce opposite-direction vortices, which interact with each other and cause flow instability similar to the mechanism forming the von Karman vortex street. The instability is greatly intensified at around unity Richardson number, when the two vortices are comparably strong. In the reacting flows, the density gradient is reversed due to chemical heat release and so is the buoyancy-induced vortex that has the same direction with the vortex of the initial shear flow. As a result, the buoyancy-induced vorticity generation would facilitate the growth of the initial shear layer, thus the near-field flow remains stable. However, the growing shear flow would eventually lead to the development of the Kelvin–Helmholtz instability in the far field.
Keywords: Buoyancy
Instability
Inverse diffusion flame
Near-field
Shear flow
Publisher: Elsevier
Journal: Combustion and flame 
ISSN: 0010-2180
DOI: 10.1016/j.combustflame.2018.01.009
Rights: © 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
© 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
The following publication Zhu, X., Xia, X., & Zhang, P. (2018). Near-field flow stability of buoyant methane/air inverse diffusion flames. Combustion and Flame, 191, 66-75 is available at https://doi.org/10.1016/j.combustflame.2018.01.009.
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