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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.
가스터빈 연소기에서 화염 간의 상호작용이 화염전달함수에 주는 영향 분석
곽상혁(Sanghyeok Kwak),최재홍(Jaehong Choi),이민철(Min Chul Lee),윤영빈(Youngbin Yoo) 한국연소학회 2022 KOSCOSYMPOSIUM논문집 Vol.2022 No.11
The effect of flame-flame interaction on flame transfer function (FTF) were analyzed in single- and dual-nozzle combustors. FTFs of two combustors showed similar low-pass filter trend and several peaks in the gain of FTF. The frequency where gain had peak values shifted to higher frequency in the dual-nozzle combustor due to flame-flame interaction. In addition, we found that flame-flame interaction in the dual-nozzle combustor enhanced nonlinearity in forced response of flame compared to the single-nozzle combustor. In our future works, we will measure flame structure using OH* chemiluminescence imaging to find the reason why the flame-flame interaction induces differences in FTF and nonlinearity in forced responses.