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임상철(Sangchul Lim),이승훈(Seunghoon Lee),안태국(Teakook Ahn),남연우(Younwoo Nam),박선호(Sunho Park) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.12
Light extinction characteristics of soot particles in ethylene and propane inverse diffusion flames have been experimentally investigated. The measured data suggested that the refractive index of soot particles varies with light wavelength due to PAH contents existing during the soot growth process. The results showed that the scattering effect is less important as the size of secondary particles rarely affects the optical properties of the soot even when the size is large enough to deviate from Rayleigh assumptions.
Current Limitation byBi-2223 Bifilar Winding Coils
안민철,윤용수,고태국,배덕권,박동근,양성은 한국초전도.저온공학회 2005 한국초전도저온공학회논문지 Vol.7 No.2
There are many kinds of high temperature superconducting (HTS) application using Bi-2223 tape which is the most commercialized HTS material. Also, resistive superconducting fault current limiters (SFCLs) have been developed using many kinds of superconducting material such as YBCO thin film, Bi-2212 bulk and so on. However, SFCL using Bi-2223 tape has never been developed. This paper deals with the feasibility study on SFCL using Bi-2223 wire. The over-current behaviors of Bi-2223 short-length sample were measured. To make the resistive SFCL, two small-scale bifilar winding modules using 7m Bi-2223 wire were fabricated; i.e. solenoid type bifilar coil and pancake type one. The short-circuit tests of the coils were successfully performed up to 16 Vrms. From these tests, the current limiting capabilities of Bi-2223 bifilar coils were confirmed and current limiting performances between two winding types were compared. In addition, the feasibility of resistive SFCL using another HTS wire, i.e. YBCO coated conductor, was also investigated.
레이저와 연속광원을 이용한 매연입자 광 소멸의 파장 의존성
임상철(Sangchul Lim),안태국(Teakook Ahn),박선호(Sunho Park),남연우(Younwoo Nam),이원남(Wonnam Lee) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.5
The dependency of wavelength on the light extinction due to the presence of soot particles has been experimentally studied with ethylene and propane co-flow diffusion flames under elevated pressure conditions. The wavelength dependency was not observed at the soot oxidation/emission region: however, the weak dependency of wavelength was observed at the soot formation region in diffusion flames.
DBD 플라즈마 개질에 의한 탄화수소계 연료 화염의 가연한계 변화
송민철(Mincheol Song),안태국(Taekook Ahn),남연우(Younwoo Nam),박선호(Sunho Park) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.12
An experimental study was conducted to find the effect of DBD plasma on the flammability limits of inert-gas-diluted fuel. The results showed that the concentration of diluting nitrogen at flammability limit increased when nitrogen-diluted methane and propane were reformed by plasma, while it decreased when nitrogen-diluted ethylene was reformed by plasma. Gas chromatography results suggested that the fuel type dependence of flammability limits is due to the difference in the concentrations of hydrogen and hydrocarbon species in reformed fuel.