Modeling the characteristic types and heat release of stretched premixed impinging flames |
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Authors: | H H Liakos M A Founti N C Markatos |
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Affiliation: | (1) Chemical Engineering Department, National Technical University of Athens, Zografou Campus, Athens 15 780, Greece, GR;(2) Mechanical Engineering Department, National Technical University of Athens, Zografou Campus, Athens 15 780, Greece, GR |
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Abstract: | A numerical code has been developed for the simulation of the impingement of a turbulent jet on a plane surface. The performance
of three turbulence models is assessed under isothermal conditions. Predictions are compared with experimental data from the
literature. Based on the results an appropriate turbulence model is selected to model a premixed jet flame impinging on a
solid surface. Mass transfer and combustion are modeled with a two-equation model simulating volumetric and kinetically controlled
chemical reaction rates. Modeling of heat transfer accounts for convection and radiation effects. Results show that under
high pressure environment turbulent premixed flames are of wrinkled-thickened type near the outlet of the nozzle (free jet
region) and of wrinkled reaction sheets in the area near the surface (impingement region and radial wall jet). The results
establish that appropriate choice of turbulence and combustion models can lead to accurate prediction of the flow characteristics. |
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