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차실내 Defrost 노즐 분류의 충돌각 변화에 따른 유동특성에 관한 실험적 연구
김덕진(Duckjin Kim),김현주(Hyunjoo Kim),이지근(Jeekeun Lee),노병준(Byungjoon Rho) 대한기계학회 2007 大韓機械學會論文集B Vol.31 No.12
The flow characteristics with the impinging angles of defrost nozzle jet inside a commercial vehicle passenger compartment were investigated experimentally by using the two-dimensional duct-nozzle model. The shape of the nozzle contraction was designed according to the curved line of cubic equation to the vertical plan of the flow direction. The impinging angles, defined as the angle between nozzle axis and a vertical line to the windshield, were varied from the 0° to 80°. The mean velocity distributions, the half-widths, and the momentum distributions with the cases of both the free jet and the impinging jet onto the dummy windshield were measured. The impinging jet flows similarly with wall jet from X/bo=20, and the impinging angle has an effect on the half-width of the impinging jet. The momentum distributions onto the windshield increased with the increase of impinging angle, and then their inflection point was observed around the impinging angle of 60°.
이유체 노즐의 액체 이송 공기 공급 방법에 따른 유량변화에 관한 연구
조민호(Minho Cho),김덕진(Duckjin Kim),이지근(Jeekeun Lee),노병준(Byungjoon Rho) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The urea-water solution in the urea-SCR system is generally injected into the exhaust gas by the two-fluid nozzle with the adaptor that allows the carrier air supply. In this paper, the effects of carrier air supplying parameters on the variation of liquid flowrate in two-fluid nozzle were investigated by using the five times magnified nozzle adaptor model. The carrier air supplying positions and liquid-air supplying conditions were considered as the experimental parameters. The internal pressure of the adaptor and the flow rate issuing from the injection nozzle were measured at the liquid supplying pressure from 2 to 4 bar and carrier air supplying pressure from 1 to 3 bar. As the results from the experiment, the internal pressure of the adaptor and the flowrate issuing from the injection nozzle were varied with the carrier air supplying position and the differential pressure between the liquid-carrier air pressures.
LIF 기법을 이용한 액막형 선회 분사기의 액막 분열특성 평가
양동욱(Donguk Yang),김재경(JaeKyoung Kim),김경남(Kyungnam Kim),김덕진(Duckjin Kim),이지근(Jeekeun Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The spray and breakup characteristics of the liquid sheet type swirl injector were evaluated using Urea-SCR injector for heavy-duty diesel engine. The results from experiments was compared with the results of a Urea-SCR injector which is already commercialized. The spraying of the liquid was controlled by pulse width modulation modes, and then spray and breakup characteristics of them were analyzed according to the injection pressures by using the PDA, PIV and LIF technique. The injector shows that the spray angle was small and the SMD was large, but the breakup length was small and the spray velocity is fast.
이중 공기공급 이유체 선회노즐의 내부 형상이 분무 특성에 미치는 영향
강신명(Shinmyoung Kang),최윤준(Yoonjun Choi),우재문(Jaemoon Woo),김덕진(Duckjin Kim),이지근(Jeekeun Lee),노병준(Byungjoon Rho) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The regulations to reduce the exhaust emissions from vehicles are becoming increasingly stringent and encompassing more types of vehicles. In the case of heavy duty diesel engines, the Urea-SCR system is currently considered to reduce the NOx emission as a proved technology, and it is widely studied to get the high performance and durability. However, the injection nozzles occur some problems, including the nozzle clogging, deposition of urea-water solution on the inner wall of exhaust pipe. In this study, the effects of nozzle cap geometry, the length to diameter ratio(l<SUB>o</SUB>/d<SUB>o</SUB>) on the spray characteristics were investigated. The mean velocity, AMD and SMD distributions of the sprays were measured using a 2-D PDA system along the centerline and radial direction. As the experimental results, the higher length to diameter ratio(l<SUB>o</SUB>/d<SUB>o</SUB>) affects the increase of axial mean velocity and the decrease of radial mean velocity. The AMD and SMD increased with the length to diameter ratio(l<SUB>o</SUB>/d<SUB>o</SUB>), as well.