Anchoring of turbulent premixed hydrogen/air flames at externally heated walls |
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Affiliation: | 1. Chair of Aerodynamics and Fluid Mechanics, Technical University of Munich, Boltzmannstr. 15, Garching bei München, 85748, Germany;2. Chair of Fluid Dynamics, Technische Universität Berlin, Müller-Breslau-Str. 8, Berlin, 10623, Germany |
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Abstract: | A joint experimental and numerical investigation of turbulent flame anchoring at externally heated walls is presented. The phenomenon has primarily been studied for laminar flames and micro-combustion while this study focuses on large-scale applications and elevated Reynolds number flows. Therefore, a novel burner design is developed and examined for a diverse set of operating conditions. Hydroxyl radical chemiluminescence measurements are employed to validate the numerical method. The numerical investigation evaluates the performance of various hydrogen/air kinetics, Reynolds-averaged turbulence models and the eddy dissipation concept (EDC) as a turbulence-chemistry interaction model. Simulation results show minor differences between detailed chemical mechanisms but pronounced deviations for a reduced kinetic. The baseline k-ω turbulence model is assessed to most accurately predict flame front position and shape. Universal applicability of EDC modeling constants is contradicted. Conclusively, the flame anchoring concept is considered a promising approach for pilot flames in continuous combustion devices. |
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Keywords: | Steady flame anchoring Wall heat transfer Hydrogen/air chemical kinetics Eddy dissipation concept |
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