Abstract
In order to carry heavier payloads and to fly longer distance, the compact engine is required. The ram combustor with the double-staged flameholders was introduced to shorten the ram combustor which is a major component of the ATR. An additional flamefolder is placed downstream of the conventional (single-staged) one to achieve quick flame expansion in the downstream direction. The ram combustion test was carried out in a 120 deg sector chamber for three cases of flameholder configuration to investigate the various effects on the combustion and aerodynamic performances. The ram combustor with the double-staged flameholders increased the combustion efficiency without large total pressure loss and therefore it was able to shorten 40% axial length of the ram combustor in comparison with the ram combustor with a conventional flameholder. In this study, for the compact ram combustor, the combustion efficiency is greater than 80% on sea level static condition where the air temperature and pressure at the combustor inlet is much lower than that of the supersonic flight condition.
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