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이형승,박종범,민경덕,김응서,Yi, Hyung-Seung,Park, Jong-Bum,Min, Kyoung-Doug,Kim, Eung-Seo 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.5
In order to investigate the exhaust structure and secondary oxidation of unburned hydrocarbon (HC) in the exhaust port, concentrations of individual HC species were measured in exhaust process, the degree of oxidation were obtained. Using a solenoid-driven fast sampling system on single-cylinder research engine fueled with 94% propane, the profiles of unburned hydrocarbons (HCs) and non-fuel HCs with a propane fueled engine were obtained from several locations in the exhaust port during the exhaust process. The sampled gases were analyzed using a gas chromatography of HC species with 4 or lesser carbon atoms. The change of total HC concentration and HC fractions of major components through the exhaust port were discussed. The results showed that non-uniform distribution of HC concentration existed around the exhaust valve and changed with time, and that the exhaust gas exhibited nearly uniform concentration profile at port exit, which was due to mixing and oxidation. Also it could be known that bulk gas with relatively high HC concentration came out through the bottom of the exhaust valve. To estimate the mass-based degree of HC oxidation in the exhaust port from measured HC concentrations, a 3-zone diagnostic cycle simulation and plug flow modeling were used. The degree of oxidation ranged between 26 % and 36 % corresponding to the engine operation conditions.
[가솔린엔진부문] 평면 이미지 기법을 이용한 분무 입경 분포 측정
윤일한(Ilhan Yoonm),이형승(Hyung-Seung Yi),민경덕(Kyoungdoug Min) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A planar image technique is applied to measure the distribution of droplet size which is related to the characteristics of emissions and combustion of GDI engine. The technique is based on the principles of fluorescence and Mie scattering of droplet in the spray. When laser light sheet illuminates particles in a cross section of spray, the particles emit fluorescence and Mie scattering light. The fluorescence and scattering signals are imaged simultaneously by an optical system composed of a doubling prism. optical filters, and an ICCD camera. Relative SMD distributions according to space and time are obtained through calculating the ratio between two light intensities and the distributions are quantified with LDPA. The experimental results show that the characteristics of GDI injector are varied with injection pressure