TED-AJ03-313 NUMERICAL ANALYSIS ON COMBUSTION CHARACTERTICS AND NO_x EMISSION OF DIFFUSION FLAME WITH HIGHLY PREHEATED AIR

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概要

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• A numerical analysis of the combustion characteristics with preheated low-oxygen air was made for a two-dimensional jet diffusion flame by using the one-step irreversible reaction mechanism and the counterflow diffusion flame by using the detailed chemistry. The effects of preheating air and lowering oxygen concentration on the combustion characteristics were examined. In the case of usual air, the maximum temperature of flame rises to about 3000K, and the behavior of the flame is almost steady. In the case of low-oxygen air, the maximum temperature decreases to about 1800K, [figure]the unsteady fluctuation occurs and develops largely toward the downstream, and the local heat release rate increases corresponding to the fluctuation of flow field. Compared with the case of the usual non-preheated air under the same flame temperature, the transition position to the turbulent flow shifts downstream, the fluctuation decreases, and the temperature distribution becomes more uniform in the case of the low-oxygen preheated air. Moreover, the local heat release rate becomes smaller due to the low oxygen concentration in the air (see Fig. A-1). NO formation characteristics in the counterflow diffusion under the same flame temperature. As the oxygen concentration decreases, the HCN and NO concentrations increase, and the NO mass production rate increases and the fuel mass consumption rate decreases, thus NO emission index increases (see Fig. A-2).[figure]

• 一般社団法人日本機械学会の論文

著者

• ZHAO D.

  Department of Epidemiology, Beijing Institute of Heart, Lung and Blood Vessel Diseases

• Yamashita H.

  Department of Physiology University of Occupational and Environmental Health, School of Medicine

• Furuhata T.

  Research Center For Advanced Energy Conversion Nagoya University

• KITAGAWA K.

  Research Center for Advanced Energy Conversion, Nagoya University

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• TED-AJ03-313 NUMERICAL ANALYSIS ON COMBUSTION CHARACTERTICS AND NO_x EMISSION OF DIFFUSION FLAME WITH HIGHLY PREHEATED AIR

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