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전문수 ( M. S. Chon ),황용하 ( Y. H. Hwang ) 한국분무공학회 2004 한국액체미립화학회지 Vol.9 No.4
N/A This paper describes the improvement of engine cooling system. To improve engine cooling performance, the authors approached in two ways. One is to increase water pump performance, changing of impeller shape and lightening of material were carried out. The second one is cooling efficiency rise, which were investigated with head gasket coolant flow passage optimization with flow visualization technique. The test results show that water pump performance was increased effectively, reduction of pump drive torque, and increase of pump flow-rate and pressure rise. Gasket hole pattern optimization test results represent an optimized head coolant flow which stands cross flow from exhaust to intake port side and small vortex were removed.
고압 분사 디젤 인젝터의 노즐 형상이 분사 특성 및 분무 거동에 미치는 영향
이창식 ( C. S. Lee ),박성욱 ( S. W. Park ),전문수 ( M. S. Chon ) 한국분무공학회 2004 한국액체미립화학회지 Vol.9 No.1
N/A This paper describes the characteristics of injection rate and macroscopic behavior of fuel spray injected from common-rail type diesel injectors with different nozzle geometries. The injection rates according to the nozzle geometries were measured at different energizing duration of the injector solenoid and injection pressure by using the Bosch`s injection rate meter based on the pressure variation in the tube. The spray behaviors injected from the different nozzles were visualized using the spray visualization system composed of an Ar-ion laser, an ICCD camera, and a synchronization system at various injection and ambient pressures. It is revealed that VCO nozzle has higher spray tip velocity at the early stage of injection duration and wider spray cone angle than the mini-sac nozzles. Also the spray cone angle is increased with the increase of nozzle diameter.
저압축 고팽창비 가솔린 기관용 수퍼차저의 과급 특성에 관한 연구
이창식(C.S.Lee),이기형(K.H.Lee),전문수(M.S.Chon),김영호(Y.H.Kim),김대식(D.S.Kim),최규훈(K.H.Choi),노석홍(S.H.Noh) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
This work deals with the performance characteristics of three lobe Roots type supercharger for the application of low compression and high expansion ratio gasoline engine. The performance test was conducted to obtain the drive power, volumetric efficiency, adiabatic efficiency, and the influence performance factors of supercharger. In order to obtain the supercharging characteristics of engine, the effect of operating conditions on the supercharging performance of low compression and high expansion ratio gasoline engine was investigated. The results show that the increase of supercharger speed and pressure ratio bring about the increase of drive power. The three lobe Roots type supercharger which was applied for this study is considered operating properly at the compression ratio less than 1.3 for the low revolution^ 5.000rpm)'. for the higher revolution, compression ratio high then 1.5 is recommended.<br/>
PTV 시스템을 이용한 가솔린 기관의 실린더내 정상 유동 해석
이창식(C.S. Lee),이기형(K.H. Lee),전문수(M.S. Chon),임경수(K.S. Im) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
Analysis and control of intake charge motion such as swirl and tumble are very important factors in improving the gasoline engine performance. In this work, the flow visualization technique and single-frame PTV(particle tracking velocimetry) are use to the steady flow test bench with 4-valve and pent-roof combustion chamber. Tumble pattern is visualized and quantified in accordance with valve lift and blockage ratio of TIV(tumble intensifying valve) and also the TIV port compare with the conventional port. The view of the instantaneous 2-D velocity field gives a realistic understanding of in-cylinder flow and thus PTV has proven to be an indispensable development tools. This flow has two tumble structures, the larger one is observed under exhaust valve side and the smaller is right below the intake valve side. The more large vorticity is observed in TIV port, thus it is concluded that TIV has effects in-cylinder flow on intensified kinetic energy.<br/>