LES of Turbulent Premixed Flame Kernel Formation and Development

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LAMBERT-THESIS-2020.pdf (8.35 MB)
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Lambert, Alexander
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Daniel Guggenheim School of Aerospace Engineering
The Daniel Guggenheim School of Aeronautics was established in 1931, with a name change in 1962 to the School of Aerospace Engineering
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http://hdl.handle.net/1853/64079
Abstract
Spark ignition of flammable mixtures is highly sensitive to early and local conditions. Kernel formation and subsequent flame development are largely governed by turbulent conditions and interactions with igniter geometry. In order to investigate this phenomenon, the use of Large Eddy Simulation (LES) is examined for (1) modelling spherical turbulent flame development, and (2) simulating spark ignition in a channel with either laminar or turbulent inflow. A comparison between LES spherical flame simulation is made to FSD-LES results as well as experimental measurements from previous studies. For spark ignition experiments, we characterize the temporal evolution of the ignition process, and demonstrate the dependence on early velocity fluctuations and local conditions.
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2020-12-17
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