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Numerical studies of vortex-induced extinction/reignition relevant to the near-field of high-Reynolds number jets

Numerical studies of vortex-induced extinction/reignition relevant to the near-field of high-Reynolds number jets 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) ( ∼ 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 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physics of Fluids American Institute of Physics
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