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Urea-SCR 시스템 적용을 위한 스월 인젝터의 분무특성
홍정구(Junggoo Hong),구건우(Kunwoo Ku),김성열(Sungryoul Kim),이충원(Choongwon Lee),강명권(Myungkweon Kang),김경남(Kyungnam Kim),김재경(Jaekyoung Kim) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.4
In this study, a swirl hollow cone injector, which has a good atomization performance at the low injection pressure relatively, was designed to apply the Urea-SCR. In order to investigate the spray pattern and SMD of a swirl injector, the spray visualization was conducted by using the simple swirl injector, and the images of the axial of stance from the nozzle exit. The shape of the spray was converted from the hollow cone to solid cone along the distance from the injector exit. The spray angle is increased and the SMD is decreased with increasing injection pressure respectively.
정병선(Byungsun Chung),장성천(Sungchun Jang),김중종(Jungjong Kim),박명수(Myungsoo Park),강명권(Myungkweon Kang) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
LPI Injector COMP’L are composed of an injector, an icing tip and an icing tube. This kind of liquid optimized LPI system has a strong point in power generation and emission characteristics by preventing the icing which is a frost of moisture around the nozzle tip as well as the improvement in evaporation nature with the spraying by fuel formation ratio. This paper is made for reducing the prime cost and securing the better icing prevention performance compared to other similar specifications by changing the current material(brass) and its shape which is the reason of high price for icing tip. According tot he experimental results, the contact area of a Manifold and an icing tip is closely related with creation of an icing and shows beneficial to icing when the contact area is the bigger. Also, it was found that the brass was the best material for an icing tip.
Urea-SCR 시스템 적용을 위한 스월 인젝터의 분무특성
홍정구(Junggoo Hong),구건우(Kunwoo Ku),김성열(Sungyoul Kim),이충원(Choongwon Lee),강명권(Myungkweon Kang),김경남(Kyungnam Kim),김재경(Jaekyoung Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.4
??In this study, a swirl hollow cone injector, which has a good atomization performance at the low injection pressure relatively, was designed to apply the Urea-SCR. In order to investigate the spray pattern and SMD of a swirl injector, the spray visualization was conducted by using the simple swirl injector, and the images of the spray cross-section were obtained from a sheet beam of Nd-Yag laser and CCD camera. The SMD of the swirl injector was measured with the axial of stance from the nozzle exit. The shape of the spray was converted from the hollow cone to solid cone along the distance from the injector exit. The spray angle is increased and the SMD is decreased with increasing injection pressure respectively.
이상진(Sangjin Lee),노유정(Yoojeong Noh),류하오(Hao Liu),이재천(Jae-cheon Lee),신용남(Yongnam Shin),박용덕(Yongduk Park),강명권(Myungkweon Kang) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.5
고압연료펌프는 GDI 엔진의 핵심 구성요소로써, 엔진출력 및 연료 효율을 향상시키기 위해서는 고압연료펌프의 유동특성을 연구하는 것이 필요하다. 본 연구에서는 유압해석툴인 AMEsim을 이용하여 고압연료펌프의 통합 모델을 생성하여 유동해석을 수행하였다. 하지만, AMEsim은 시스템 해석을 위한 1차원 모델이므로 복잡한 유동현상이 발생하는 부근에서의 해석 결과는 정확하지 않은 단점이 있으므로 본 연구에서는 전산해석프로그램인 Fluent를 이용하여 난류유동이 발생하는 체크밸브의 흡입부와 토출부에서 유량과 알짜힘을 계산하였다. 다양한 압력조건과 밸브 간극변화에 따른 CFD 해석 결과는 AMEsim모델에 대한 룩업테이블로 사용되어 AMEsim의 결과를 보완함으로써 고압연료펌프에 대한 성능분석결과의 정확성을 향상시키는 결과를 얻을 수 있었다. A high-pressure fuel pump is a key component in a gasoline direct injection (GDI) engine; thus, understanding its flow characteristics is essential for improving the engine power and fuel efficiency. In this study, AMESim, which is a hydraulic analysis program, was used to analyze the performance of the high-pressure fuel pump. However, since AMESim uses a one-dimensional model for the system analysis, it does not accurately analyze the complicated flow characteristics. Thus, Fluent, computational fluid dynamics (CFD) software, was used to calculate the flow rates and net forces at the intake and discharge ports of the high-pressure fuel pump where turbulent flow occurs. The CFD analysis results for various pressure conditions and valve lifts were used as look-up tables for the AMEsim model. The CFD analysis results complemented the AMEsim results, and thus, improved the accuracy of the performance analysis results for the high-pressure fuel pump.