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직분식 가솔린 엔진에서 흡기과급이 연료혼합기의 형성과 거동에 미치는 영향
백은성(Eunseong Pack),김동욱(Dongwook Kim),강정중(Jeongjung Kang),최경민(Gyungmin Choi),김덕줄(Duckjul Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
This study was performed to investigate the effect of the different boosted intake pressures with various piston cavity geometries on formation and behavior of fuel mixture in a DI gasoline engine. The spatial distribution of fuel mixtures after impingement of spray against a piston cavity is one of the most important factors for the formation and behavior of the in-cylinder fuel. Three different boosted intake pressures were induced by using a compressor. Two dimensional spray fluorescence images of liquid and vapor phase were acquired to analyze the behavior and distribution of fuel mixture inside cylinder by exciplex fluorescence method. The exciplex system of fluorobenzene / DEMA in non-fluorescing base fuel of hexane was employed. Wall angle of piston cavity were set to 30, 60 and 90 degrees, respectively. The spray impinges on the cavity and diffuses along the cavity wall by its momentum. From present study. it was found that boosted intake pressure, cavity wall angle and cavity diameter affected the fuel mixture inside of cylinder.
[가솔린엔진부문] 가솔린 고압 수월 인젝터 분무의 속도장에 미치는 분위기 압력의 영향
성기진(Keejin Sung),황순철(Soonchul Hwang),최동석(Dongseok Choi),김덕줄(Duckjul Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
PIV(Particle Image Velocimetry) method is one of the laser diagnostic techniques to visualize the velocity fields of sprays. The purpose of this paper is to acquire GDI spray development process under different ambient pressures using PIV. Fuel spray experiments was performed within a constant volume chamber. The spray structure, velocity maps, velocity contour and vorticity contour were applied to investigate spray characteristics of high-pressure swirl injector. As the experiment results of this work, it was found that the fuel spray behavior have important relation to the ambient pressure and this pressure is related to velocity distribution inside of spray. Besides, the different ambient pressure brings the different vortex regions and maximum vorticity value.