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DNS of turbulent premixed flames near isothermal wall

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.2390
page 12

Akihiko Tsunemi
Department of Mechanical and Aerospace Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

Mamoru Tanahashi
Department of Mechanical and Aerospace Engineering Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

Toshio Miyauchi
Dept. Mechanical and Aerospace Eng., Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan; Organization for the Strategic Coordination of Research and Intellectual Properties Meiji University 1-1-1 Higashimita, Tama-ku, Kawasaki, Kanagawa, Japan

Makoto Nagaoka
Toyota Central R&D Labs., 41-1 Aza Yokomichi, Oaza Nagakute, Nagakute-cho, Aichi-gun, Aichi 480-1192, Japan

Abstract

Direct numerical simulations 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, whereas that of methane/air turbulent flame is not enhanced by turbulence. The dominant parameters which determined the total heat losses are also discussed from several realizations for the statistically same turbulent field.

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