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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimir: 2150-766X
ISSN On-line: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.350
pages 330-339

IMPROVEMENT OF FLAMEHOLDING CHARACTERISTICS BY INCIDENT SHOCK WAVES IN SUPERSONIC FLOW

T. Fujimori
Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd. ,Toyosu, Koto-ku, Tokyo 135-8731 JAPAN
M. Murayama
Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd. ,Toyosu, Koto-ku, Tokyo 135-8731 JAPAN
J. Sato
Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd. ,Toyosu, Koto-ku, Tokyo 135-8731 JAPAN
H. Kobayashi
Institute of Fluid Science, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577 JAPAN
S. Hasegawa
Institute of Fluid Science, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577 JAPAN
T. Niioka
Institute of Fluid Science, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577 JAPAN

RESUMO

The objective of this study is to investigate the effect of incident shock waves on flameholding behind a fuel injection strut in low temperature supersonic flow, and to elucidate the structure of the flameholding region. A non-premixed hydrogen flame was established behind a fuel injection strut in Mach 2.5 supersonic airflows with total temperature between 400 K and 900 K. The shock waves interacted with the wake behind the fuel injection strut, which improved the flameholding characteristics remarkably by enlarging the recirculation flow and enhancement of mixing. The incident position and the strength of the shock waves control the size of the recirculation flow and flameholding limit. As the strength increases, the upper limit of fuel flow rate for flameholding increases. As the incident points of the shock waves move downstream from the strut base, the upper limit decreases and finally the flame is not stabilized for any fuel flow rate. Instantaneous OH distribution in the flameholding region was observed by laser induced fluorescence. The main reaction occurs near the base at the small fuel flow rate. As the flow rate increases, OH distribution moves downstream and varies between the front and the middle section of the wake. On the other hand, homogeneous OH distribution is observed around the rear throat region of the wake until the blow-off. This suggests that the upper flameholding limit is largely determined by the stability of flame base in the throat region.


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