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5~50㎚ 입자 직경에서 집속 가능한 새로운 공기역학렌즈의 개발과 특성에 관한 연구
이광승(Kwang-Seung Lee),김송길(Songkil Kim),오용석(Yongsuk Oh),이동근(Donggeun Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
An orifice type of aerodynamic lens is generally used to focus nanoparticles. However, it is impossible to focus particles smaller than 10㎚ in air due to flow instability of fluid in a lens. In this study, we propose a new converging-diverging type of the aerodynamic lens capable of focusing particles of 5-50㎚ in air. Designing factors of the lens configurations is also extracted and explained in detail through a numerical simulation. It was demonstrated that the aerosols are delivered from the entrance to the downstream of the lens system with 90% transmission efficiency. The final beam diameters are shown to be more or less l ㎜ in the range of particle size.
디젤산화촉매장치를 적용한 대형디젤기관에서 ULSD와 바이오디젤 사용에 의한 기관성능과 배출가스에 미치는 영향에 관한 실험적 연구
한영출(Youngchool Han),박만재(Manjae park),김동우(Dongwoo Kim),오용석(Yongsuk oh),나완용(Wanyong Rha) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Modern after-treatment technology has been developed variously in order to exhausted emission in diesel engine. However, it seems very difficult to comply wi stringent emission standards. This research is focused on diesel emission charao, poisoning effect on diesel oxidation catalyst when ULSD and Bio-diesel are applied the effect of viscosity according to sulfur content in ULSD is evaluated. In th engine performance before/after equipped DOC in 11,OOOcc diesel engine, the effect power and fuel consumption is negl igible in ULSD or bio-diesel. However, emis significantly reduced in the application ULSD and bio-diesel along with DOC. There, test presents the reduction efficiency of CO and HC are very effective in ULSD and<br/> due to DOC and the efficiency is much more effective when ULSD and bio-diesel are us<br/>