Experimental Study on the Stabilization Mechanism of Diffusion Flames in a Curved Impinging Spray Combustion Field in a Narrow Region

Hideo Kawahara, Konosuke Furukawa, Koichiro Ogata, Eiji Mitani and Koji Mitani
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Hideo Kawahara: Department of Shipping Technology, National Institute of Technology, Oshima College, 1091-1 Komatsu, Suo Oshima, Oshima, Yamaguchi 742-2193, Japan
Konosuke Furukawa: Department of Shipping Technology, National Institute of Technology, Oshima College, 1091-1 Komatsu, Suo Oshima, Oshima, Yamaguchi 742-2193, Japan
Koichiro Ogata: Department of Mechanical Engineering, National Institute of Technology, Oita College, 1666 Maki, Oita City 870-0152, Japan
Eiji Mitani: SSC Co., Ltd., Tomomachi Ushiroji 26-216, Fukuyama, Hiroshima 720-0202, Japan
Koji Mitani: SSC Co., Ltd., Tomomachi Ushiroji 26-216, Fukuyama, Hiroshima 720-0202, Japan

Energies, 2021, vol. 14, issue 21, 1-16

Abstract: HVAF (High Velocity Air Flame) flame spraying can generate supersonic high-temperature gas jets, enabling thermal spraying at unprecedented speeds. However, there is a problem with the energy cost of this device. This study focused on combustors that used cheap liquid fuel (kerosene) as the fuel for HVAF. In this research, we have developed a compact combustor with a narrow channel as a heat source for the HVAF heat atomizer. Using this combustor, the stability of the flame formed in the combustor, the morphology of the flame, and the temperature behavior in the combustion chamber were investigated in detail. As a result, the magnitude of the swirling airflow had a great influence on the structure of the flame formed in the combustor, and the stable combustion range of the combustor could be determined. As the swirling air flow rate changes, the equivalent ratio of the entire combustor changes significantly, and the flame structure also transition from the premixed flame to the diffusion flame. From this study, it was confirmed that the temperature inside the combustor has great influence on the flame structure.

Keywords: diffusion flame; curved impinging jet combustion; narrow region; stable combustion; temperature fluctuation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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