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H₂/CO 합성가스의 비예혼합 난류 제트화염에서 화염 길이와 EINOx 스케일링
황정재(Jeongjae Hwang),손기태(Kitae Sohn),Nicolas Bouvet,윤영빈(Youngbin Yoo) 한국연소학회 2012 한국연소학회지 Vol.17 No.4
The flame lengths and NOx emission characteristics of syngas H₂/CO turbulent non-premixed jet flames were investigated. The flame length which is the main parameter governs NOx emission was studied for various syngas compositions. The flame length was compared with previous correlation between Froude number and flame height and it shows that they have good agreements. It was confirmed that the turbulent jet flames herein investigated are in the region of buoyancy-momentum transition. NOx emission was reduced with increased Reynolds number and CO contents in syngas fuel and with decreased fuel nozzle diameter which is attributed by decreased flame residence time. Previous EINOx scaling based on flame residence time of Lf³/(df²Uf) satisfies only the jet flame in momentum-dominated region, not buoyancy-momentum transition region. The simplified flame residence time (Lf/Uf) was adopted in modified EINOx scaling. The modified scaling satisfies the jet flames not only in momentum-dominated region but in buoyancy-momentum transition region. The scaling is also satisfied with H₂/CO syngas jet flames.
난류 제트 확산화염에서 PIV/OH-PLIF 동시측정을 이용한 날림 한계 근처에서의 변형률 및 OH 구조에 관한 연구
황정재(Jeongjae Hwang),김태성(Taesung Kim),윤지수(Jisu Yoon),윤영빈(Youngbin Yoon) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.2013 No.12
Simultaneous measurements of planar laser-induced fluorescence (PLIF) of OH radicals and particle image velocimetry (PIV) were used to investigate the effect of strain rates and OH thicknesses on the detachment of turbulent syngas non-premixed jet flames. Mean values of the extensive principal strain rate on the OH layer decrease with the axial distance, and the maximum value appears near the nozzle. Flames with various fuel jet Re near detachment have almost identical minimum OH thicknesses.
V-gutter 보염기가 있는 모델 램제트 연소기에서의 연소불안정의 실험적 연구
황정재(Jeongjae Hwang),송진관(Jinkwan Song),송재천(JaeCheon Song),윤영빈(Youngbin Yoon) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Characteristics and mechanisms of combustion instability in model ramjet combustor with V-gutter flameholder are experimentally investigated at airflow speed of 27.5m/s and 36.7m/s, especially 27.5m/s. For acquiring instability frequency and rms value, dynamic pressure sensor was used at combustor. With an aid of the high-speed photography, the phenomena of flame dynamics is well illustrated. Schlieren photography in cold flow shows relations between vortex or temporal characteristic of recirculation zone and combustion instability. Results shows that instability occurs strongly in lean condition, Φ = 0.65 - 0.75, and the frequency is near 30㎐. A flame in recirculation zone appears periodically and the period is well matched with instability frequency. Combustion instability is highly relative with the temporal characteristics of recirculation zone rather than vortex shedding frequency behind the flameholder.
동축공기가 있는 H₂/CO 비예혼합 난류 제트화염의 화염 안정성에 대한 실험적 연구
황정재(Jeongjae Hwang),Nicolas Bouvet,손기태(Kitae Sohn),윤영빈(Youngbin Yoon) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
The research on the stability characteristics of the H₂/CO syngas jet flame in the turbulent region was conducted. Syngas fuel composition fraction, nozzle diameter, fuel velocity and coaxial air velocity were varied to investigate the effects of those on the characteristics of stability and mechanism of blowoff/liftoff. For higher CO content fuel, blowoff/liftoff is occurred at relatively low fuel velocity. But for all case of composition of fuel and all case of nozzle geometry, they have similar trend of blowoff/liftoff limit which is like a C-curve in fuel-air velocity diagram. The coaxial air diameter does not effect on the blowoff/liftoff coaxial air velocity in case of same fuel nozzle geometry.