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 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 -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.
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Research Article|
May 27 2009
Numerical studies of vortex-induced extinction/reignition relevant to the near-field of high-Reynolds number jets
Rishikesh Venugopal;
Rishikesh Venugopal
School of Mechanical Engineering,
Purdue University
, West Lafayette, Indiana 47907, USA
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John Abraham
John Abraham
a)
School of Mechanical Engineering,
Purdue University
, West Lafayette, Indiana 47907, USA
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a)
Author to whom correspondence should be addressed. Electronic mail: jabraham@ecn.purdue.edu.
Physics of Fluids 21, 055106 (2009)
Article history
Received:
July 25 2008
Accepted:
April 02 2009
Citation
Rishikesh Venugopal, John Abraham; Numerical studies of vortex-induced extinction/reignition relevant to the near-field of high-Reynolds number jets. Physics of Fluids 1 May 2009; 21 (5): 055106. https://doi.org/10.1063/1.3139308
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