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다이슬라이드식 사출성형을 위한 하이브리드 시스템 구축 및 검증
정수진(Soojin Jeong),문성준(Seongjoon Moon),문주호(Juho Moon) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Die slide injection as eco-friendly manufacturing process in the injection molding greatly reduce the cost and time because they can simplify the conventional process through elimination additional process, as well as has advantage of precision, dimensional stability, and completeness as functional device. However, to maximize these advantages, the high-efficiency hybrid system should be applied to the die slide injection. In this paper, how to apply the hybrid system is proposed for precise injection, and through this system, the production process for plastic sealed container is introduced. In addition, new process and conventional process were compared by measuring as follows; power consumption, productivity, and dimensional accuracy. As a result, high-efficiency of the hybrid system was confirmed.
3차원 CFD 상세 유로모델을 이용한 커먼레일 디젤인젝터의 내부 유동특성 분석
정수진(Soojin Jeong),문성준(Seongjoon Moon),이상인(Sangin Lee),김태훈(Taehun Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Advanced combustion technologies for common-rail diesel injection engines require high performance fuel injectors. Therefore, computational predictions of the diesel injector performance have been performed to evaluate internal flow characteristics on the needle lift and the spray pattern at the nozzle exit. However, when the injector is in operations, only some flow driven out of the injector by pressure drop at the nozzle exit, the others flow is returned to fuel supply lines through a spool valve for needle lift control. Actually, the internal flow passage of an entire injector duct including injection and return routes has never been adopted for three-dimensional computational fluid dynamics(CFD) analysis. In this study, the computational prediction of the internal flow characteristics of the entire injector duct in the common-rail diesel injector is carried out by using STAR-CCM+ 7.04 code. For this, computations were carried out under the assumption that the internal flow passage is a steady-state condition at the maximum needle lift. The results show that pressure and velocity profiles of the this model, we found that the very thin flow passages appear a pressure drop and velocity increase. In particular, the study focuses on the uniformity index due to flow rate deviation between the needle entrance and the nozzle exit.
박상훈,정수진,박영우,박유경,송범중,Park, Sanghoon,Jeong, Soojin,Park, Youngwoo,Park, Ukyung,Song, Beomjung 한국교통대학교 융복합기술연구소 2013 융ㆍ복합기술연구소 논문집 Vol.3 No.1
This study is concerned with air-conditioning system in use of thermoelectric device. It is introduced that the well designed structures for better cooling & heating performance with high efficiency. And also it is performed that the system performance test of four types trial products for the use of hybrid commercial vehicle. System performance is affected by many component parts, especially heat sink design & power control method. It is applied that dual extrusive fin tube with buffer zone for the effective radiating of circulating liquid in tube. And also it is applied that power supply method with constant-current system. It is attained that system cooling capacity is 1.2kW, COP is 0.95.
박정권,김현철,정수진,전문수,Park, JungKwon,Kim, Hyunchul,Jeong, SooJin,Chon, MunSoo 한국교통대학교 융복합기술연구소 2013 융ㆍ복합기술연구소 논문집 Vol.3 No.1
The next generation alternative fuel of diesel, DME (Dimethyl Ether) discharges particulate matter hardly due to chemical structural as oxygen-fuel so it has the eco-friendly property. Despite these advantages, the DME has the technical difficulties to apply to the diesel engine because of a low calorific value, viscosity and compressibility effects. From this point of view, we performed experimental studies on improved reliability of DME common-rail vehicle and lubricity enhancement of DME fuel for empirical distribution of eco-friendly DME fuel. Also we analyzed solubility of lubrication enhancer according to a drop in temperature, try to secure reliability about core parts of DME vehicle by applying lubrication enhancer in the DME common-rail vehicle.
디젤엔진용 SCR 후처리장치의 요소분해 개선을 위한 주요 설계인자들의 최적화 연구
문성준(Seongjoon Moon),정수진(Soojin Jeong),김태훈(Taehun Kim) 한국자동차공학회 2019 한국자동차공학회 지부 학술대회 논문집 Vol.2019 No.5
The Selective Catalytic Reduction(SCR) of nitrogen oxides by ammonia has been proposed as a solution for mobile diesel engines to meet automotive emission regulations. In this study, in order to improve the NOx removal efficiency of an automotive urea-based SCR system requires optimized injection system to minimize wall deposition film while providing uniform distribution of exhaust gases and reductant mixture in front of SCR catalyst. The focus of the current study is to optimize the injection parameters of Urea-Water-Solution(UWS), internal flow simulation was first performed using a computational fluid dynamics. In the computational fluid dynamics, the spray/wall interaction of injected UWS spray droplets and the heated surrounding gas is modeled using the Eulerian-Lagrangian approach. A specially validated wall deposition properties are implemented to simulate the depletion mechanism of individual UWS droplets. Also, to evaluate the influence of wall film on the atomized droplets, two different spray model are used. The results real that the Cumulative-Density-Function(CDF) spray model predicts the area and thickness of the wall deposit formation, which is important for the understanding of their impingement on wall. Next, a regression model was found by using the Optimization method, based on the results of the CFD analysis. Then, the optimal solutions of the injection parameters providing the highest ammonia conversion were compared with those of the base model.
박상훈(Sanghoon Park),정수진(Soojin Jeong),박영우(Youngwoo Vahc),권오현(Ohyun Kwon),송범중(Beomjung Song) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This study is concerned with air-conditioning system in use of thermoelectric device. It is introduced that the well designed structures for better cooling & heating performance with high efficiency. And also it is performed that system performance test & reliability assessment test for the use of commercial vehicle. System performance is affected by many component parts, especially heat sink design & method. It is applied that dual extrusive fin tube with buffer zone for the effective radiating of circulating liquid in tube. It is attained that system cooling capacity is 1.23㎾, COP is 0.85. And also it is verified that the operating state of system is stable in several severe reliability tests.