대향류 반응 및 비반응 유동장에서의 단일 와동의 동적 거동

유병훈; 오창보; 황철홍; 이창언

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이 논문의 연구 히스토리 (3)

2004

비예혼합 대향류 및 동축 제트화염에서 산소부화에 따른 NOx 생성특성

유병훈 , 황철홍 , 한지웅 외 1명 KOSCO SYMPOSIUM 논문집 2004.01 학술대회자료

2003

대향류 반응 및 비반응 유동장에서의 단일 와동의 동적 거동

유병훈 , 오창보 , 황철홍 외 1명 대한기계학회 논문집 B권 2003.09 학술저널

2002

대향류 비예혼합화염과 상호작용하는 단일 와동의 생성특성에 관한 연구

유병훈 , 오창보 , 황철홍 외 1명 KOSCO SYMPOSIUM 논문집 2002.01 학술대회자료

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A two-dimensional direct numerical simulation is performed to investigate the dynamic behaviors of a single vortex in counter reacting and non-reacting flow field. A predictor-corrector-type numerical scheme with a low Mach number approximation is used in this simulation. A 16-step augmented reduced mechanism is adopted to treat the chemical reaction. The budget of the vorticity transport equation is examined to reveal a mechanism leading to the formation, destruction and transport of a single vortex according to the direction of vortex generation in reacting and non-reacting flows. The results show that air-side vortex has more larger strength than that of fuel-side vortex in both non-reacting and reacting flows. In reacting flow, the vortex is more dissipated than that in non-reacting flow as the vortex approach the flame. The total circulation in reacting flow, however, is larger than that in non-reacting flow because the convection transport of vorticity becomes much large by the increased velocity near the flame region. It is also found that the stretching and the convection terms mainly generate vorticity in non-reacting and reacting flows. The baroclinic torque term generates vorticity, while the viscous and the volumetric expansion terms attenuate vorticity in reacting flow. Furthermore, the contribution of volumetric expansion term on total circulation for air-side vortex is much larger than that of fuel-side vortex. It is also estimated that the difference of total circulation near stagnation plane according to the direction of vortex generation mainly attributes to the convection term.