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이젝터형 희석장치와 SMPS 시스템을 사용한 디젤 입자상 배출 물질의 크기분포 측정에 관한 연구
황순철(Soonchul Hwang),김덕줄(Duckjool Kim),윤성한(Sunghan Yun),한방우(Bangwoo Han),김용진(Yongjin Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This study presents the characteristics of particle number and size distributions from the diesel exhaust. These were measured for various load and speed conditions of two different engines using ejector-type diluter sampling system. The sampled exhausts were analyzed by scanning mobility particle sizer(SMPS). Because the dilution leads to the particle transformations of nucleation and condensation when exhaust particles are cooled and diluted, to fine the effect of dilution temperature on the particle number and size distribution, the additional measurements under various dilution temperatures were performed. As a result of this study, it is found the ultrafine particle is very sensitive to the exhaust and dilution temperatures.
다양한 분위기 압력에서 GDI 분무 해석을 위한 혼합 분열 모델 연구
심영삼(Youngsam Shim),황순철(Soonchul Hwang),김덕줄(Duckjool Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The purpose of this study is to obtain the accurate prediction for the atomization process of GDI spray on various ambient conditions. The computational study of hollow cone spray for high-pressure swirl injectors was performed. Several hybrid models using the modified KIVA code have been introduced and compared. LISA model and CSD model were used for the primary breakup, and TAB and APTAB models were used for secondary breakup. To compare with the calculated results, the experimental results such as cross-sectional images and SMD distribution were acquired by exciplex fluorescence method and Phase Doppler Analyzer respectively. The experiment and the<br/> computation was performed at the ambient pressure of 0.1 MPa, 0.5 MPa, 1.0 MPa and the ambient temperature of 293K. The results show that CSD+APTAB hybrid model has the best prediction for spray formation process.<br/>
[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.