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김슬기,이기만,KIM, SEULGI,LEE, KEEMAN 한국수소및신에너지학회 2018 한국수소 및 신에너지학회논문집 Vol.29 No.4
An experimental study was conducted to investigate behavior of surface oxidation with steel type. The excess entalphy combustion in porous media system was applied to implement the direct radiation heating system. The surface oxidation thickness (SOT) in fuel-lean condition was thicker than the SOT in fuel-rich. Also, the SOT was increased by increasing residence time. Detailed explanations were given by SEM and EDS analysis.
환형노즐을 모사한 캔 연소기에서 Symmetry Breaking에 의한 종-방향 연소불안정성 제어 연구
이희도(Huido Lee),김재현(Jaehyeon Kim),이기만(Keeman Lee) 한국추진공학회 2021 한국추진공학회지 Vol.25 No.2
In this study, the effect of Symmetry Breaking was compared according to the equivalent ratio condition and the number of nozzles where combustion instability occurs in an annular combustor. Generally, due to the relatively short combustor length, a longitudinal instability was less likely to occur in the annular combustor, but the combustion instability sometimes happens when ducts such as transition piece in gas turbine power station are present. In this case, due to the duct, only the longitudinal instability mode is observed. The characteristics of Symmetry Breaking were investigated according to the number of five lean nozzles and the equivalent ratio combination, and as the equivalent ratio decreased, the effect of Symmetry Breaking rapidly occurred, and the instability was dramatically disappeared and the amplitude was greatly reduced. In addition, it was confirmed that as the number of lean nozzles increased, a phenomenon such as a reduction in the equivalent ratio appeared.