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윤여빈(Yu-Bin Yoon),문창호(Chang-Ho Moon),박영준(Young-Joon Park),조용석(Yong-Seok Cho) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The growing concerns on environmental protection have been constantly demanding cleaner and more energy efficient vehicles without compromising any conveniences provided by the conventional vehicles. The recent significant advances in proton-exchange-membrane (PEM) fuelcell technology have shown the possibility of developing such vehicles powered by fuelcells. FCEV is essentially a zero emission vehicle and allows to overcome the range limitation of the current battery electric vehicles. However, there still remains major issues that need to be overcome before it can be fully accepted by consumers. This paper describes the current fuelcell vehicle development status and the staggering challenges for the successful introduction of consumer acceptable FCEVs. We made a fuel cell cart(KFCV-2) to estimate a driving performances and a fuel cell vehicle simulator to predict a characteristics of each component.
소형 연료전지 카트의 제작 및 모델링을 통한 주행성능 예측
윤여빈(Yu-Bin Yoon),박영준(Young-Joon Park),김득상(Duk-Sang Kim),조용석(Yong-Seok Cho) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As Fuel cell emits zero emissions and has a high efficiency to compare with internal combustion engine, it is considered as a major source to generate power for vehicles. In this study, in order to estimate the driving characteristics of a fuel cell vehicle, we made a small fuel cell electric cart and design a numerical model. The cart composed of Ballard NEXA fuel cell, DC-DC buck-converter, motor and motor controller and their specifications are measured and applied to the numerical model. This model calculates current of motor, current and voltage of fuel cell and vehicle speed. Comparing measured results with calculated shows good agreements. Using this model, we can predict the driving performance and characteristics of components in fuel cell electric vehicle.
Baffle plate의 형상에 따른 오일분리 성능에 관한 해석적 연구
김형구(Hyung-Gu Kim),윤여빈(Yu-bin Yoon),박영준(Young-Joon Park),이성욱(Seang-Wock Lee),조용석(Yong-Seok Cho) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Emission regulation for an SI engine is becoming stricter continuously. If blow-by gas, which contains oil mist, recirculates in a cylinder, it cause severe harmful emissions and engine problems. Thus an SI engine also needs the oil separator to separate oil mist in blow-by gas. Comparing SI engine with CI engine, SI engine has a small quantity of blow-by gas, so it needs highly efficient oil separator. Baffle plate is very easy to produce and it has low back pressure among the many kind of oil separators. In this paper, a model was developed that adopted baffle plate and porous plate. Flow characteristics, oil separation performance and back pressure with various position and shape of baffle plate was calculated by CFD. As results, the more flow that faced to baffle plate cause increase of efficiency. And modified oil separator can have low back pressure and high oil separation efficiency.
환원제 분사 방법 및 디퓨져 형상에 따른 LNT 촉매 전단에서의 환원제 분포 향상에 관한 해석적 연구
임주형(Joo-Hyoung Lim),윤여빈(Yu-bin Yoon),송춘섭(Chun-Sub Song),박영준(Young-Joon Park),이성욱(Seang-Wock Lee),조용석(Yong-Seok Cho) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The lean NOX trap is one of the promising technologies for the NOx reduction to meet more strict future emission regulation like as EURO 5 or 6. LNT catalysts are based on the concept of absorbing NOx in lean exhaust gas conditions and reducing it in rich conditions. In generally, HC and hydrogen gas have been using as the reductant to make rich conditions. In this research, hydrogen enriched gas that made by reformer was used as the reductant. There is a relationship between concentration uniformity and NOx regeneration efficiency. If concentration uniformity was improved, The NOx regeneration efficiency would be increased. In this study, the flow characteristics and the concentration uniformity with various methods were calculated by CFD. As results, the concentration uniformity of reductant has been improved through adapted injection distance, injection angle and design of diffuser.
선택적 환원 촉매(SCR)에서 암모니아(NH₃) 분사량 최적화에 대한 실험적 연구
장익규(Ik-Kyoo Jang),윤여빈(Yu-Bin Yoon),박영준(Young-Joon Park),이성욱(Seang-Wock Lee),조용석(Yong-Seok Cho) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The Selective catalytic reduction(SCR) system is a highly-effective device of NO<SUB>x</SUB> reduction for diesel engines. Generally, the ammonia(NH₃) generated from a liquid urea-water solution is used for the reductant. The ideal ratio of NH₃ molecules to NO<SUB>x</SUB> molecules is 1:1 based on NH₃ consumption and having NH₃ available for reaction of all of the exhaust NO<SUB>x</SUB>. However, under the too low and too high temperature condition, the NO<SUB>x</SUB> reduction efficiency becomes lower, due to temperature window. And space velocity also affects to NO<SUB>x</SUB> conversion efficiency. This paper reviews a laboratory study to evaluate the effects of NO<SUB>x</SUB> and NH₃ concentrations, gas temperature and space velocity on the NO<SUB>x</SUB> conversion efficiency of the SCR system. The maximum conversion efficiency of NO<SUB>x</SUB> was indicated when the NH₃ to NO<SUB>x</SUB> ratio was 1.2 and the space velocity was 60,000 h?¹. The results of this paper contribute to improve overall NO<SUB>x</SUB> reduction efficiency and NH₃ slip.
Urea-SCR 시스템에서 Urea 분사 방법 및 믹서 장착에 따른 환원제 분포특성에 관한 해석적 연구
임주형(Joo-Hyoung Lim),윤여빈(Yu-bin Yoon),송춘섭(Chun-Sub Song),박영준(Young-Joon Park),이성욱(Seang-Wock Lee),조용석(Yong-Seok Cho),주재근(Jae-Geon Joo),김현옥(Hyunok Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The Selective catalytic reduction(SCR) system is a highly-effective device of NOx reduction for diesel engines. Generally in SCR system, urea-water-solution is used as the reductant to produce NH₃. It is well known that NH₃ distribution in front of SCR is strongly related with de-NOx performance of SCR catalyst. when NH₃ is non-uniform, it will cause deterioration of de-NOx performance and NOx-slip. In this paper, CFD has conducted to improve de-NOx performance and NH₃-slip . As results, the concentration uniformity of reductant and mean temperature of reductant infornt of SCR have been improved by applying mixer and alternating injection methods.
Urea-SCR 시스템에서 De-NO<SUB>x</SUB> 성능 향상을 위한 배기관 설계 최적화에 관한 실험적 연구
이재균(Jae-Kyoun Lee),윤여빈(Yu-Bin Yoon),송춘섭(Chun-Sub Song),박영준(Young-Joon Park),조용석(Yong-Seok Cho),주재근(Jae-Geon Joo),김현옥(Hyun-Ok Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The selective catalytic reduction(SCR) system is potentially a highly-effective means of NOx reduction for diesel engine. Generally, SCR makes use of a reductant added to the exhaust gas that can be used for reacting nitric acids to nitrogen. The reductant, ammonia(NH₃) generated from a liquid urea-water solution. The ideal ratio of NH₃ molecules to NOx molecules is 1:1 based on NH₃ consumption and having NH₃ available for reaction of all of the exhaust NOx. The SCR system has good NOx conversion performance in the temperature window about 250 to 400℃, low space velocity also leads to increase of NOx conversion efficiency, due to long residence time in the catalyst. In this paper, Urea-SCR system has tried to find the optimal shape of the exhaust pipe for improvement of de-NOx performance. This study used the blade-type mixer and various pipes for reduction at up stream of catalyst to improve the uniformity. As a result, the de-NOx performance of Urea-SCR system was improved and exhaust geometry was optimized, too.