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Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

NEAR-WALL BEHAVIORS OF TURBULENT HYDROGEN/AIR AND METHANE/AIR PREMIXED FLAMES

pages 667-672
DOI: 10.1615/TSFP6.1070
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ABSTRACT

Direct numerical simulations (DNSs) of interactions between turbulent premixed flame and isothermal wall have been conducted to investigate heat losses and quenching mechanism of turbulent premixed flames near the wall. Near-wall behaviors of hydrogen/air and methane/air premixed flames were investigated by considering detailed kinetic mechanism. For hydrogen/air flame, heat release rate in near-wall region is higher than that of freely-propagating flame. For methane/air flame, however, heat release rate near the wall becomes lower than that of freely-propagating flame. This difference is caused by different contributions of certain low-temperature reactions that are enhanced near the wall to the total heat release rate. The wall heat flux of hydrogen/air turbulent flame is higher than that of corresponding laminar flame, because the turbulent burning velocity increases significantly and pressure rises near the flame region. For methane flame, however, the wall heat flux nearly coincides with that of laminar flame since the turbulent burning velocity is not enhanced due to local extinction.

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