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평면 레이저 유도 형광법을 이용한 메탄 예혼합 화염의 NO 및 OH 분포에 관한 실험적 연구
차민석(M.S.Cha),이원남(W.Lee),송영훈(Y.-H. Song),정석호(S.H.Chung) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
No and OH radical distributions have been measured in a methane/air premixed flame on a laminar co-fow burner. PLIF(planar laser induced fluorescence) of the A²∑^+ ― X₂∏₂(1.0) transition was excited for OH radical and the A²∑^+ ― X₂∏₂(0.0) transition was excited for NO using a Nd:YAG pumped OPO/FDO system. The OH radical concentration was decreased with N₂dilution due to the decrease of flame temperature in a flame of Φ=1.0. In a flame of Φ=1.6, however. the OH radical distribution was observed in the broader region and was not altered with N₂addition. NO LIF results show that the NO production in a Φ=1.6 flame in this co-flow burner was higher than that of a stoichiometric flame. The contribution of prompt NO is likely to responsible for this obseraation. The added N₂affects the NO concentration in different ways for Φ=1.0 and Φ=1.6 cases. The NO considered was decreased in a flame of Φ=1.0. where the thrmal NO is considered the only important mechanism. In a flame of Φ=1.6. N₂ addition did not change the NO concentration. where both the thermal and prompt NO mechanisme are important<br/>
최상규(S. K. Choi),원상희(S. H. Won),정석호(S. H. Chung),차민석(M. S. Cha),송영훈(Y. H. Song) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Characteristics of syngas combustion was studied numerically for various mixing ratios of methane and syngas which was produced by partial oxidization of methane. Ideal case in which CH₄ is completely decomposed into CO and H₂, and the syngas obtained by equilibrium code which contains other species, were compared. For ideal case, the composition of premixture varies almost linearly for reforming rate, while the composition of syngas from equilibrium code varies nonlinearly and does not vary much until the reforming rate of 0.4. When the mixture of ambient temperature was used, as reforming rate increases, flame temperature decreases but laminar burning velocity increases. This inverse trend which is not general is due to the decrease of overall activation energy as reforming rate. The exponential term of the reaction rate which contains the activation energy and temperature shows similar trend to the laminar burning velocity. Lean flammability limit is expanded, and extinction stretch rate of diffusion flame is increased as reforming rate increases. The flame characteristics is more improved for the ideal case, it will be important to reform effectively to achieve better performance of combustor.
전기장이 튜브내 예혼합화염 전파속도에 미치는 영향에 관한 연구
류승관(S. K. Ryu),원상희(S. H. Won),차민석(M. S. Cha),정석호(S. H. Chung) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
The effect of electric fields on flame speed has been investigated experimentally by observing propagating premixed flames in a tube for methane/air mixtures. The flame speeds were measured in both the normal and micro gravity conditions to substantiate the measurements. The results show that the flame speeds were enhanced by both the AC and DC electric fields, as the flame approached to the high voltage electrode located on the one end of the tube. The enhancement of flame speed was proportional to the square root of the electric field intensity, defined as the voltage applied divided by the distance of flame from the high voltage electrode, when the electric field intensity is sufficiently large. When the electric field intensity was low, there existed critical intensities, below which the electric fields did not influence the flame speed. This critical electric field intensity correlated well with the flame speed.
아크제트 플라즈마를 이용한 메탄건식개질 반응에서 CO₂와 O₂ 첨가의 영향
황나경(N. K. Hwang),차민석(M. S. Cha),송영훈(Y.-H. Song) 한국연소학회 2008 한국연소학회지 Vol.13 No.4
The reaction mechanism of methane dry reforming has been investigated using an arc-jet reactor. The effects of input power, CO₂/CH₄ and added O₂ were investigated by product analysis, including CO, H₂, C₂HY and C₃HY as well as CH₄ and CO₂. In the process, input electrical power activated the reactions between CH₄ and CO₂ significantly. The increased feed ratio of the CO₂ to CH₄ in the dry reforming does not affect to the CH₄ conversion, but we could observe increase in CO selectivity together with decreasing H₂ generation. Added oxygen can also increase not only CO selectivity but also CH₄ conversion. However, hydrogen selectivity was decreased significantly due to a increased H₂O formation.