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당량비와 열방출률에 따른 예혼합화염의 CH* chemiluminescence 신호 특성
강석민(Sukmin Kang),이원남(Wonnam Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The CH* chemiluminescence characteristics of premixed flames and their variation with equivalence ratio and heat release rate has been experimentally investigated on laminar methane and propane premixed flames. The measured chemiluminescence intensities are observed linearly proportional to the fuel flow rate, which could be considered as linearly proportional to the heat release rate under fuel lean conditions. The effect of equivalence ratio could be expressed by an exponential function as ICH*∝ α₁ exp(b₁ φ), where α₁=0.00054 and b₁= 4.60 for methane and α₁=0.0056 and b₁=5.02 for propane. Oscillating flames showed the temporal fluctuation of chemiluminescence intensity : however, the time averaged values are virtually identical to those of quiescent flames under the same fuel flow rate and equivalence ratio condition. This observation suggests that there is no flame stretch effect on chemiluminescence intensity, in average values.
부봉현,Sukmin Kang,Ari Furuya,Ken Judai,Nobuyuki Nishi 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.11
Infrared multiphoton dissociation (IRMPD) spectra of various protonated 1,2-diaminoethane-water clusters DAE-H+-(H2O)n (n = 1-6) were measured in the wavelength range of 3000-3800 cm−1. The IRMPD spectra of the well separated ionic clusters were simulated by the MP2 method employing various basis sets. Comparison of the IRMPD spectra with the theory indicates that each cluster may exist as several low-lying conformers, and the sum spectra of the various conformers reveal almost one to one correspondence between theory and experiment. Free N-H and O-H stretches are observed in the ranges of 3400-3500 and 3600-3800 cm−1, respectively. The O-HLN and N-HLO stretches are, however, observed in the broad region of 3000-3600 cm−1. The theoretical calculations on DAE-H+-(H2O)n (n = 1-4) show gradual decrease of the average binding energy between DAE-H+ and H2O as the cluster size increases, attaining the lowest value of 55 kJ/mol when n = 4. We found a low energy barrier of 21 kJ/mol to the isomerization converting the lowest energy cluster of DAE-H+-H2O to the second lowest one.
연료에 따른 층류 예혼합화염의 CH* Chemiluminescence 신호특성 변화
이원남(Wonnam Lee),강석민(Sukmin Kang) 한국연소학회 2008 한국연소학회지 Vol.13 No.2
The CH* chemiluminescence of premixed flames and their dependency on fuel types has been experimentally investigated on laminar methane and propane premixed flames. The measured chemiluminescence intensities are observed linearly proportional to the fuel flow rate, which could be interpreted as the CH* chemiluminescence signal is linearly proportional to the heat release rate under fuel lean conditions. The effect of equivalence ratio could be expressed by an exponential function as ICH*∝α₁ exp(?₁Φ), where α₁=0.00054 and ?₁=4.60 for methane and α₁=0.0056 and ?₁=5.02 for propane. Oscillating flames showed the temporal fluctuation of chemiluminescence intensity: however, the time averaged values are virtually identical to those of quiescent flames under the same fuel flow rate and equivalence ratio conditions. This observation suggests that there is no significant flame stretch effect on chemiluminescence intensity, in average values.
PIV 기법을 이용한 Side stream 저압막 모듈 유입구 구조개선 검증에 관한 연구
이민영(Minyoung Lee),윤석민(Sukmin Yoon),강문선(Moon-Sun Kang),박노석(No-Suk Park) 대한환경공학회 2020 대한환경공학회지 Vol.42 No.3
목적 : 본 연구에서는 실제 사용되는 사이드 스트림 방식의 저압막 모듈을 대상으로 유입부의 수리구조를 개선하여 베셀로 유입되는 유량을 수직으로 균등하게 분포시킬 수 있는 방안을 제시하고자 하였으며, 이를 실험적으로 검증하고자 하였다. 방법 : 입자영상유속(particle image velocimetry, PIV)장치를 이용하여 기존 대비 막 모듈내 유입 유량의 균등성을 실측하였다. 결과 및 토의 : 그 결과 이중 격벽 유입부 구조가 흐름이 편중되어 유입되는 유동 경향이 기존 단일 격벽 유입부 구조 대비 개선된 것을 확인할 수 있었다. 이중 격벽의 경우 3초, 4초 그리고 5초의 속도 분포가 전체 유동장에서 평균속도 0.03 m/s에 근접한 속도 분포를 보였으며, 단일 격벽에 대비 약 60%가 적은 0.06 m/s의 최대 속도를 나타내었다. 결론 : 수평방향 유동 흐름을 관측하였을 때 이중 격벽 유입부 구조의 경우 0.008 m/s, 단일 격벽 유입부의 구조의 경우 0.027 m/s로 약 300% 감소하는 것으로 관측되었다. Objectives : The purposes of this study are to suggest a method to distribute the flow rate into the overall vessel vertically and evenly by improving the inlet hydraulic structure of the side stream type low pressure membrane module. Methods : For those, particle image velocimetry (PIV) technique was used to measure the evenness of flow rate distribution in both of the existing full scale single baffled inlet structure and the improved membrane module inlet structure (double baffled). Results and Discussion : As a result, it was confirmed that the flow distribution of the double baffled inlet structure is improved in comparison to that of the existing single baffled inlet structure. In the case of double baffled inlet structure, the instantaneous velocity distributions of 3, 4, and 5 seconds showed a velocity distribution close to the mean velocity of 0.03 m/s in the entire flow field. Also, a maximum velocity of 0.06 m/s was about 60% less than that of the single baffled inlet structure case (0.13 m/s). Conclusion : When the horizontal flow was observed, it decreased by about 300%. Those were 0.008 m/s for the double baffled inlet structure and 0.027 m/s for the single baffled, respectively.