Large eddy simulation of strongly radiating nonpremixed turbulent jet flames
Abstract
In this dissertation a study of numerical simulations of strongly radiating nonpremixed turbulent jet flames is presented. In order to account for the physical coupling of turbulent mixing, combustion and soot chemistry, and luminous radiation the Large Eddy Simulation (LES) technique is used. The subgrid-scale (SGS) turbulence models include non-dynamic and dynamic compressible Smagorinsky models, as well as the mixed-model and the two-parameter mixed model. The SGS combustion models used include conserved scalar approaches, namely the laminar flamelet model, and direct closure approaches employing scale-similarity ideas. Direct Numerical Simulation (DNS) is initially used to develop and assess several SGS turbulence and combustion models in the context of two-dimensional (2D) planar idealized reacting jets. LES results of a 2D idealized strongly radiating nonpremixed turbulent jet flame are presented in order to investigate the interactions between turbulent mixing and soot radiation. Efforts towards extending LES to a 2D acetylene-air jet flame under realistic laboratory conditions are then presented. Finally, extension of LES to three-dimensional turbulent jets and jet flames are pursued and results examining the effect of vorticity dynamics on scalar mixing with comparison to experimental data are presented.
Degree
Ph.D.
Advisors
Frankel, Purdue University.
Subject Area
Mechanical engineering
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