TED-AJ03-375 A STUDY OF LAMINAR BURNING VELOCITY FOR H_2/O_2/He PREMIXED FLAME AT HIGH PRESSURE AND HIGH TEMPERATURE
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概要
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Experimental and numerical studies on laminar burning velocities of a stoichiometric H_2/O_2He mixture were performed in a pressure range of 0.1 to 1.0MPa and in a mixture temperature range of 300 to 500K. The H_2/O_2 mixture was diluted by helium to the helium dilution ratio of 82% in volume in order to increase Lewis number of hydrogen more than unity and to decrease laminar burning velocity to restrain flame instabilities. Flames were kept stable in the all of the experimental conditions due to the increase of Lewis number which enhances diffusive-thermal effect to stabilize Darrieus-Landau instability occurring at elevated pressure, and due to the decrease of laminar burning velocity which lessens Darrieus-Landau instability. Measurements of laminar burning velocity were conducted using particle tracking velocimetry (PTV) combined with planar laser induced fluorescence of OH radical (OH-PLIF) for burner-stabilized flames in a high-pressure combustion chamber. This technique provides the information of instantaneous local burning velocities in the all region of flame, and the laminar burning velocities were determined using the laminar burning velocities in the region outside of the boundary layer and far from the flame tip, indicating flame stretch and curvature are almost zero. Numerical simulations were also conducted using one-dimensional premixed flame code, and their results were compared with experimental results in order to verify the existing H_2/O_2 detailed reaction mechanisms in a high-pressure and high-temperature environment. Modification of the reaction mechanism was also performed in order to correct the reduction ratio of laminar burning velocity with respect to ambient pressure for various temperatures of the mixture. The numerical results using modified reaction mechanism were in good agreement with experimental results in terms of the pressure dependency of laminar burning velocity for the preheated mixture up to 500K.[figure]
- 一般社団法人日本機械学会の論文
著者
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KOBAYASHI Hideaki
Institute of Fluid Science, Tohoku University
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Ogami Yasuhiro
Department Of Aeronautics And Space Engineering Tohoku University
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Kobayashi Hideaki
Institute Of Fluid Science Tohoku University
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