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Type: Journal article
Title: Numerical studies of vortex-induced extinction/reignition relevant to the near-field of high-Reynolds number jets
Author: Venugopal, R.
Abraham, J.
Citation: Physics of Fluids, 2009; 21(5):055106-1-055106-11
Publisher: Amer Inst Physics
Issue Date: 2009
ISSN: 1070-6631
Statement of
Rishikesh Venugopal and John Abraham
Abstract: This work is motivated by the need to understand physical mechanisms governing near-field phenomena, such as flame lift-off, in high-Reynolds number jet flames. Numerical studies of vortex-induced flame extinction/reignition are performed for conditions representative of the near field of high-Reynolds number ( ∼ 100 000) jets under high pressure and temperature conditions. The governing equations for compressible, viscous, and reacting flows are solved along with a single-step irreversible chemical kinetic model for gaseous n-heptane oxidation. Extinction/reignition phenomena, influenced by unsteady and curvature effects, are observed. Unsteady flamelet/progress variable models are shown to accurately describe the flame response during extinction/reignition observed in the flame-vortex studies. Furthermore, while unsteady effects on extinction/reignition are found to diminish with weaker vortices and relatively strong flames, curvature effects are found to increase with relatively thicker flames. The observed flame-vortex interaction regimes are summarized on an outcome diagram, which is useful to understand the nature of localized flame dynamics in the near field of jet flames.
Keywords: compressible flow; flames; flow instability; flow simulation; jets; reaction kinetics theory; turbulence; viscosity; vortices
Rights: © 2009 American Institute of Physics
RMID: 0020123300
DOI: 10.1063/1.3139308
Appears in Collections:Mechanical Engineering publications

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