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전산유체역학을 통한 요소첨가 선택적 촉매환원장치의 질소산화물 저감 예측에 관한 연구
문성준(Seongjoon Moon),조낙원(Nakwon Jo),오세두(Sedoo Oh),이호길(Hokil Lee),김태민(Taemin Kim) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
To our knowledge, diesel vehicles are known as compression ignition engines, so diesel emissions contain relatively high levels of nitrogen oxides(NOx) and particulate matter(PM). Specially, NOx is a key ingredient in the formation of unban smog, and contribute to the formation of acid rain. Therefore, diesel vehicle should be equipped with urea-SCR system as high performance catalyst in order to reduce harmful NOx emissions. This paper presents a numerical study of the NOx reduction efficiency of urea-SCR systems using porous media in the three-dimensional CFD code. And tnen multi-phase flow characteristics coupled with chemical reactions of the transport phenomena in the urea-SCR system are predicted numerically using Eulerian-Lagrangian CFD analysis that can be used to compare the experiment results.
디메틸에테르 연료의 적용에 따른 고압연료 분사장치의 내부 유동특성에 대한 해석적 분석
문성준(Seongjoon Moon),조낙원(Nakwon Jo),김현준(Hyunjun Kim),오세두(Sedoo Oh),이호길(Hokil Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
From now on the alternative vehicle technologies by using DME fuel require high performance fuel injectors. Accordingly, the previous studies on the numerical and experimental analysis of the DME injector have focused on a optimum geometry to induce proper injection rate. But, three-dimensional computational fluid dynamics(CFD) model of the internal flow passage of a entire injector duct including injection and return routes has never been studied. In this study, the computational prediction of the internal flow characteristics of the entire injector duct in the high performance DME fuel injector is carried out by using STAR-CCM+ 7.06 code. In this work, 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 flow deviation and pressure & 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 cavitation generation due to the very thin flow passages not only a injection route but also a return route.
다이슬라이드식 사출성형을 통한 플라스틱 밀봉용기 성형에 관한 연구
문성준(Seongjoon Moon),이평찬(Pyoungchan Lee),정수진(Soojin Jeong) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Die slide injection as eco-friendly manufacturing process marvelously reduces the cost and time in processing plastic sealed container because they can simplify the conventional process through eliminating additional process. However, the high-speed injection of resin-seal-molding in the die slide injection invokes undesired shape defects, which can be extremely minimized by die correction or process parameter control. In this study, the process parameters of the injection molding are optimized by using CAE analysis and Taguchi method. The process variables are optimized by using the L₁?(or L?)orthogonal array and smaller-the-better characteristics of the Taguchi method. In addition, according to two kind of polypropylene and one kind of polyethylene, results of experiments were compared by measuring as the analyzing experiments. Consequently, the applicability of the Die slide injection was confirmed.
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.
커먼레일 디젤인젝터에서 분사성능 개선을 위한 내부유로형상 최적화에 관한 연구
문성준(Seongjoon Moon),정수진(Soojin Jeong),김태훈(Taehun Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
In recent years, common-rail injection(CRDI) engines have become more common as power sources for passenger cars and light duty trucks because of stricter exhaust emission standards, satisfaction of consumer demands for better fuel efficiency and increased power. Specifically, common-rail diesel injectors are the most critical component of the CRDI engines that determine engine performances through high pressure injection with exact control. Therefore, the studies on the numerical and experimental analysis of the diesel injector focus on a optimum geometry to induce proper injection rate. In this study, design parameters of an entire injector duct are optimized by using a three-dimensional computational fluid dynamics(CFD) analysis and Response Surface Method(RSM). The CFD analysis is simulated by employing STAR-CCM+ 7.06 code, and the entire internal flow was assumed to be steady-state at the maximum needle lift. The design parameters are optimized by using the L16 orthogonal array and polynomial regression, local-approximation characteristics of RSM. Meanwhile, the optimum values are confirmed to be similar in 95% confidence and 5% significance level through analysis of variance(ANOVA). Futhermore, optimal design and prototype design were compared by calculating the injection quantities, resulting in the improvement of the injection performance more than 54%.