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문남수(Namsoo Moon),이상규(Sangkyoo Lee),이지근(Jeekeun Lee) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.5-1
This study reports a numerical analysis of the internal flow characteristics of the integrated urea-SCR muffler system with the various geometries of the multi-perforated tube which is set up between the muffler inlet and in front of SCR catalysts. The multi-perforated tube is generally used to disperse uniformly the urea-water solution spray and to make better use of the SCR catalyst, resulting in the increased NOx reduction and decreased ammonia slip. The effects of the multi-perforated tube orifice area ratios on the velocity distributions in front of the SCR catalyst, which is ultimately quantified as the uniformity index, were investigated for the optimal muffler system design. The steady flow model was applied by using a general-purpose commercial software package. The air at the room temperature was used as a working fluid, instead of the exhaust gas and urea-water solution spray mixture. From the analysis results, it was clarified that the multi-perforated tube geometry sensitively affected to the formation of the bulk swirling motion inside the plenum chamber set in front of the SCR catalyst and to the uniformity index of the velocity distribution produced at the inlet of the catalyst.
문남수(Namsoo Moon),이상규(Sangkyoo Lee),이지근(Jeekeun Lee) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.5-1
A multi-perforated tube indicates the existence of multi holes in various shapes on the surface of long cylinder-type or rectangular tubes. In this study, the flow characteristics of the circular multi-perforated tube with many orifices on the surface were investigated experimentally and numerically. The volume flowrate issuing from each orifice, discharged angle, effective flow area ratio were measured and visualized with the variation of the orifice area ratio at the same blockage ratio. The volume flowrate distributions along the flow direction of the multi-perforated tube tends to be more uniform as larger orifices were positioned at the inlet side of the multi-perforated tube, compared with no orifice area change along the flow direction.
촉매삽입형 Urea-SCR 머플러 다공튜브 형상변화에 따른 NOx 저감 특성에 관한 연구
문남수(Namsoo Moon),이상규(Sangkyoo Lee),고상철(Sangchul Ko),이지근(Jeekeun Lee) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.12
Urea-SCR 머플러 시스템 입구와 촉매 전단에 설치된 다공튜브는 우레아 수용액 분무의 균일분포, SCR 촉매 활용도 증대 및 암모니아 슬립을 방지하기 위해 사용되고 있다. 다공튜브의 오리피스 면적비 변화가 머플러 챔버 내부유동 특성에 끼치는 영향이 상용 소프트웨어를 이용하여 해석적으로 조사되었다. 다공튜브 오리피스 면적비 변화는 촉매 전단에 설치된 챔버 내부의 벌크 선회유동 형성과 촉매전단 속도분포의 균일도 지수에 큰 영향을 끼침을 보였다. 해석결과를 검증하기 위해 엔진실험이 ESC 및 ETC 모드에서 수행되었다. 엔진 실험결과 다공튜브 길이방향으로 보다 많은 유량이 흐르는 모델이 가장 높은 NOx 저감 효율을 나타냈으며, 이것은 높은 균일도지수 및 강한 선회유동을 나타내는 해석 결과와 일치됨을 알 수 있었다. A multi-perforated tube is generally installed between the muffler inlet and in front of selective catalytic reduction (SCR) catalysts in the integrated urea-SCR muffler system in order to disperse the urea-water solution spray uniformly and to make better use of the SCR catalyst, which would result in an increase nitrogen oxide (NOx) reduction efficiency and a decrease in the ammonia slip. The effects of the multi-perforated tube orifice area ratios on the internal flow characteristics were investigated analytically by using a general-purpose commercial software package. From the results, it was clarified that the multi-perforated tube geometry sensitively affected the generation of the bulk swirling motion inside the plenum chamber set in front of the SCR catalyst and to the uniformity index of the velocity distribution produced at the inlet of the catalyst. To verify the analytical results, engine tests were carried out in the ESC and ETC modes. Results of these tests indicated that the larger flow model in the longitudinal direction showed the highest NOx reduction efficiency, which was a good agreement with the analytical results.
Urea-SCR 머플러 다공튜브 형상변화에 따른 유동특성 해석
이상규(Sangkyoo Lee),문남수(Namsoo Moon),이지근(Jeekeun Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This study reports a numerical analysis of the flow characteristics of the Urea-SCR muffler system with the various geometry of the perforated tube. The perforated tube set inside the muffler is generally used to disperse uniformly the Urea-water solution spray and to increase the reaction inside the SCR catalyst, resulting in the reduction of NOx. The steady flow model was simulated with the general-purpose software package "FLUENT", to study the flow characteristics in the muffler. As the working fluid the air at the room temperature was used, instead of the exhaust gas and Urea-water solution spray mixture. The effects of the hole diameter and the blockage ratio on the flow characteristics were investigated for optimal muffler system design that is attained to produce the uniform velocity or pressure distributions in the front of the SCR catalyst. From the analysis results, it was clarified that the flow characteristics inside the muffler are very sensitive to the perforated tube geometry and significantly affected by the blockage ratio.
다공튜브의 오리피스 구성에 따른 출구 유동특성에 관한 연구
이상규(Sangkyoo Lee),문남수(Namsoo Moon),이지근(Jeekeun Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The perforated tube, arranging with constant orifices in the circumferential direction of the pipe or duct, was used. The internal flow characteristics of the perforated tube show complex and cross-flow near the exit. The distribution of flow rate at the exit of the perforated tube shows the non-uniform flow, and it is one of the most important parameter in the optimum design of the perforated tube. In addition flow characteristic is affected by the orifice, configuration. The purpose of this study is to find the optimum design parameters which can be control the gradient of mass flow rate distribution at the exit of the orifice. The numerical study was carried out with blociage ratio of the exit plane and Reynolds number of inlet flow.
이종소재 접합을 적용한 압축진개시스템 테일게이트에 대한 구조안정성 평가
양동욱(Dongyuk Yang),정윤식(Yunsik Jeong),문남수(Namsoo Moon),고동훈(Donghun Ko),유석근(Seokgeun Yoo) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
In addition to the recently optimum design for the development of lightweight technology, examples of applying the composite material is increased. Compression dust system for collecting and transporting the current garbage and waste, we use material of high-strength steel sheet, the durability life is reduced by corrosion or rusting caused by salt and contaminants, by using the welding method sensitive as sex and no good, by applying such a composite material in order to solve the problem, the durability of parts, improved corrosion resistance, fuel consumption and travel distance increases the weight lighter loading platform, operating productivity is improved. In this study, using the finite element analysis program, it was examined structural stability of compressed garbage system tailgate to which the heterogeneous material junction. The maximum open angle of the tail gate is 56 degrees, up to a maximum deformation amount 5.03mm occurred result of analysis in the load case in the state in tailgate tip open, maximum stress in the tailgate rotating plate coupling part 175.27 ㎫ occurs. Further, it was confirmed that was not satisfied than the reference safety factor 1.5.
Engine ECU_ILS적용 상용차량의 연비 및 배출가스 평가시스템 개발
고영진(Youngjin Ko),김태준(Taejun Kim),박경민(Kyungmin Park),노윤식(Yunsik Ro),문남수(Namsoo Moon),오승용(Seungyong Oh) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Jeonbuk Institute of Automotive Technology(JIAT) has recently developed a Hardware-in-the-Loop(HIL) testing system for Engine ECU of Hybrid Electric Vehicle(HEV). The objective of this project was to develop an evaluation system for fuel economy and exhaust emission evaluation of commercial hybrid electric vehicles appling ECU_ILS technology. This system was previously applied to conventional vehicles. To develop an engine and vehicle, there is a need for a system that can evaluate power performance such as dynamometer and exhaust gas analyzer but a lot of times and expenses are spent. In contrast, a model based development environment provides a less expensive alternative which controlled repeatable tests can be performed in much shorter time periods. Therefore, HILS system environment that can consider the behavior of actual vehicles for evaluation of control logic, fuel consumption and exhaust gas is required. This developed system can analyze and evaluate fuel injection rate, fuel injection time, fuel consumption and exhaust gas using map like actual vehicle test on road. Also, this system is expected to be able to analyze the effects of vehicles behavior and control logic development of peripheral device in relation to engine and vehicles. This HIL system can be used to develope the system that can evaluate fuel economy and exhaust gas by control strategy of commercial hybrid vehicle systems in the future.