TED-AJ03-328 LOCAL FLAME STRUCTURE OF H_2-AIR PREMIXED FLAMES PROPAGATING IN ROTATING TURBULENCE
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概要
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Direct numerical simulations (DNS) of hydrogen-air premixed flames propagating in three-dimensional rotating turbulence are conducted to investigate the effects of the system rotation on the structure of the turbulent premixed flames. A detailed kinetic mechanism including 12 reactive species and 27 elementary reactions are used to represent the H_2/O_2 reaction in turbulence. DNSs are performed for the two cases : the angular vector of the system rotation is parallel and perpendicular to the direction of mean flame propagation. In rotating turbulence, the distribution of fine-scale eddies shows regularities in the direction of the angular vector due to Coriolis force as shown in Fig. A-1. The direction of many fine-scale eddies in the parallel case tends to be perpendicular to the flame front and that in the perpendicular case tends to be parallel. The distribution of the heat release rate is highly localized by the turbulence-flame interaction in the parallel case. On the contrary, in the[figure] perpendicular case, the whole of the flame front shows high heat release rate. Turbulent burning velocity depends on the direction of the angular vector. The turbulent burning velocity in the perpendicular case is higher than that in the parallel case. To clarify the mechanism of the increase of burning velocity in the perpendicular case, local flame structure is investigated statistically. Most of flame elements in the Perpendicular case show high heat release rate compared with that of laminar flame, and the mean heat release rate exceeds 1.2 times of the laminar case. However, in the parallel case, the heat release rates are fluctuating around that of laminar flame. The curvature of flame front and strain rate on the flame surface are important parameters to characterize local flame structure. The heat release rate increases linearly with the curvature of the flame front in both case. The heat release rate at the flat flame elements reaches 1.2 times laminar flame in the perpendicular case, whereas it is nearly identical to laminar flame in the parallel case. The strain rate tangential to the flame front in the perpendicular case is larger than that in the parallel case and stretched flame elements shows high heat release rate. These results suggest that the stretch cause the increase of heat release rate in the perpendicular case. Figure A-2 shows the distribution of heat release rate and velocity vectors on a typical x-y plane in the perpendicular case. The stretch is due to shear flow near the flame front. Absolute value of velocity component in y direction increases in the burnt side owing to Coriolis force, which leads to generate shear flow near the flame front. This shear stretches the flame front strongly, and leads to the increase of burning velocity.[figure]
- 一般社団法人日本機械学会の論文
著者
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Miyauchi Toshio
Department of Mechanical and Aerospace Engineering,Tokyo Institue of Technology
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Miyauchi T
Dept. Of Mechanical And Aerospace Eng. Tokyo Inst. Of Tech.
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Miyauchi Toshio
Department Of Mechanical And Aerospace Engineering Tokyo Institute Of Technology
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TANAHASHI Mamoru
Department of Mechano-Aerospace Engineering, Tokyo Institute of Technology
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Tanahashi Mamoru
Dept. Of Mechanical And Aerospace Eng. Tokyo Inst. Of Tech.
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Tanahashi Mamoru
Department Of Mechanical And Aerospace Engineering Tokyo Institute Of Technology
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NADA Yuzuru
Dept. of Faculty of Risk and Crisis Management, Chiba Inst. Of Sci
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NADA Yuzuru
Department of Mechanical and Aerospace Engineering, Tokyo Institute of Technology
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Nada Yuzuru
Dept. Of Faculty Of Risk And Crisis Management Chiba Inst. Of Sci
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NADA Yuzuru
Department of Energy System, The University of Tokushima
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