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상호작용하는 두 스월 안정 화염에서 발생하는 준임계 분기 현상
이지호(Jiho Lee),박준형(Junhyeong Park),한동식(Dongsik Han),김규태(Kyu Tae Kim) 한국연소학회 2019 한국연소학회지 Vol.24 No.2
The nonlinear bifurcation behavior of two self-excited interacting swirl flames was investigated in a model lean-premixed gas turbine combustor. We examined the system’s thermoacoustic state using several time series analysis methods, including spectrograms, phase portraits, and recurrence plots. It was shown that the state of the system in response to the variation of the combustor length is influenced by the presence of multiple attractors, eventually leading to an extremely large amplitude limit cycle via a subcritical bifurcation.
희박 예혼합 모델 가스터빈 연소기에서 스월유동 특성이 화염 간 상호작용에 미치는 영향
이지호(Jiho Lee),박준형(Junhyeong Park),한동식(Dongsik Han),김규태(Kyu Tea Kim) 한국연소학회 2018 한국연소학회지 Vol.23 No.1
The effect of swirl flow structures on combustion dynamics of two interacting, lean-premixed flames was experimentally investigated, with a particular emphasis on swirl numbers and swirl rotational directions. Our results show that the amplitude of limit cycle oscillations is very sensitive to the combination of swirl numbers and rotational directions, while the instability frequency remains nearly unchanged. The counter-rotating cases show significantly lower pressure perturbations, and this behavior appears to be related to the formation of compact interacting zone with higher heat release rate, indicating the presence of increased flame surface wrinkling caused by intense turbulence.
디젤 엔진의 분사각 변화가 배기가스에 미치는 영향에 관한 수치해석적 연구
배명직(Myungjik Bae),이병화(Byounghwa Lee),한동식(Dongsik Han),전충환(Chunghwan Jeon),장영준(Youngjune Chang),송주헌(Juhun Song) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In order to reduce NOx and Soot emissions simultaneously , characteristics of diesel spray and combustion were investigated by numerical simulation with StarCD in this paper. This work focuses on effect of Spin Injection. A simulation model of combustion, spray and emissions is developed for heavy duty marine diesel engine application. Simulation is performed with change of spray angle between first and second directions at fixed engine speed, injection timing, injection duration and etc. The results show that Spin Spray Injection method can reduce NOx emission. And the results show that the 1st injection considerably interfere with 2nd injection characteristics.