Proceedings of the Korean Society of Propulsion Engineers Conference (한국추진공학회:학술대회논문집)
- 2004.03a
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- Pages.55-61
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- 2004
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- 1975-342X(pISSN)
Characteristics of Flame-holding in a Scramjet Combustor with a Cavity
- Tanaka, Hideyasu (Dept. Mechanical and systems Engineering, Gifu University) ;
- Takahashi, Shuhei (Dept. Mechanical and systems Engineering, Gifu University) ;
- Uriuda, Yoshitaka (Dept. Aeronautics and Astronautics, University of Toky) ;
- Wakai, Kazunori (Dept. Mechanical and systems Engineering, Gifu University) ;
- Tsue, Mitsuhiro (Dept. Aeronautics and Astronautics, University of Toky) ;
- Kono, Michitaka (Dept. Aeronautics and Astronautics, University of Toky) ;
- Ujll, Yasushige (Dept, Mechanical Engineering, Nihon University)
- Published : 2004.03.01
Abstract
Numerical simulations were conducted in a rectangular scramjet combustor with a cavity and/or a step in order to investigate their performances for flame-holding. Flow structures and OH radical profiles in the cavity and the step were calculated. The calculated results showed that the cavity generated a larger recirculation zone than the step that had the same depth. Additionally, the combustor with a cavity could make a large low-velocity area than the combustor with a step. The cavity performance was determined by its depth and length. The cavities with too large or too short length did not work effectively, and a certain aspect ratio showed high performance for flame-holding. There was a minimal depth under which the cavity did not work as flame-holder. The fuel injections upstream the cavity and inside the cavity were also tested to investigate the effects on the cavity performance. The result showed that the fuel injection inside the cavity reduced reaction areas and residence time. Therefore, the upstream injection was preferable to the inside injection.