TED-AJ03-379 NUMERICAL SIMULATION OF THE DYNAMIC BEHAVIOR OF JET DIFFUSION FLAMES INTERACTED WITH A LARGE SCALE VORTEX
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概要
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This paper describes a numerical study on the H_2/N_2 jet diffusion flame interacted with large scale vortices generated by oscillating the fuel or air velocity. Computations are made of transient normal and inverse diffusion flames. Attentions are paid to the dynamic behavior of the diffusion flames with the transient local extinction and to the flame structure in relation to the local flame parameters such as local flame stretch, flame curvature and preferential diffusion. The obtained results are as follows. (1) The velocity of oscillating jet at the nozzle exit has a tendency that near the inner wall of nozzle the reverse flow region grows in deceleration and the velocity rises beyond that near the central axis in acceleration. (2) When the amplitude of oscillation of fuel velocity is relatively small and flame extinction does not occur by the effect between flame and [figure]vortex, the tendency of temperature, OH concentration, H_2 ratio and enthalpy are closely similar. The region of higher stretch rate and higher heat release rate corresponds to each other, but their profiles do not correlate with temperature. This indicates that the H_2 dilution by preferential diffusion among species and enthalpy deficit by the non-unity Lewis number effect are responsible for the flame temperature characteristics. (3) In both normal and inverse diffusion flame, flame extinction occurs around the vortex when the flames are interacted with the comparatively strong oscillation. One of the edge flames constructed at the extinction propagates along the stoichiometric line around the vortex to the upstream region, and it is again connected with another edge flame. (4) In the inverse diffusion flame, the structure of triple flame remarkably appears in each edge flame before connection each other.[figure]
- 一般社団法人日本機械学会の論文
著者
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Kinoshita Shinichi
Department Of Fermentation Technology Faculty Of Engineering Osaka University
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Takagi Toshimi
Department Of Mechanophysics Engineering Graduate School Of Engineering Osaka University
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Takagi Toshimi
Department Of Mechanical Engineering Alty Of Engineering. Osaka University
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WAKITA Masahiro
Department of Mechanophysics Engineering, Graduate School of Engineering, Osaka University
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Wakita Masahiro
Department Of Mechanophysics Engineering Graduate School Of Engineering Osaka University
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Kinoshita Shinichi
Department Of Chemical Process Engineering Faculty Of Engineering Hokkaido University
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Kinoshita Shinichi
Department of Mechanophysics Engineering, Graduate School of Engineering, Osaka University
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Wakita Masahiro
Department of Chemical Engineering, Nagoya University
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