Diesel 기관(機關)의 미립자(微粒子)와 NO_X 동시저감(同時低減)에 관한 연구(硏究)

오영택,Oh, Young Taig 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.9

Recently, the automobile industry has been faced with very serious problems related to the very restricted regulations of exhaust gas emissions. Therefore many researchers have been attracted to the development of oxygenated fuel for a solution to these problems. This paper deals with the effects of oxygenated fuel on exhaust emissions. An experimental study was conducted to investigate PM and $NO_X$ emission using dimethyl carbonate as an oxygenated fuel in a naturally aspirated DI diesel engine. With increased oxygenated fuel amounts. there were significant reductions in PM, HC and CO emissions mainly from depressed thermal cracking. while little increase in $NO_X$ was encountered concurrently. The effective reduction in PM with oxygenated fuel was maintained with the presence of $CO_2$. which suggested low $NO_X$ and PM obtained from the combination of using oxygenated fuel and cooled EGR. Thermal cracking and an analysis of the heat release rate were also studied in the experiment.

택배 물류사업 진출방안 연구 -B생활정보사를 중심으로-

오영택 ( Young Taig Oh ),홍상태 ( Sang Tai Hong ),강경식 ( Kyong Sik Kang ) 한국물류학회 2007 물류학회지 Vol.17 No.2

직접분사식 디젤기관에서 연료조성 변화에 의한 배기가스 배출특성

오영택(Young Taig Oh),최승훈(Seung Hun Choi) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5

In this paper, the effect of oxygen component in mixed fuel on the exhaust emissions has been investigated for direct injection diesel engine. It tested to estimate change of engine performance and exhaust emission characteristics for the commercial diesel fuel and oxygenated blend fuel which has tour kinds of fuel and various mixed rates. This study carried out by comparing with diesel fuel and diesel fuel blended DGM(diethylene glycol dimethyl ether), MTBE(methyl tert-butyl ether), DMC (dimethyl carbonate) and EGBE(ethylene glycol mono-n- butyl ether). And, the effects of exhaust gas recirculation(EGR) on the characteristics of NOx emission and brake specific fuel consumption rate have been investigated, too. It was found that simultaneous reduction of smoke and NOx was achieved with oxygenated fuel and EGR method.

연료조기증발장치를 이용한 가솔린기관의 배기가스 저감 및 시동성능개선에 관한 연구

오영택(Young-Taig Oh),문영호(Young-Ho Moon),김준수(Jun-soo Kim) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.2

Recently, the automobile industry has been faced with serious problems related to the restricted regulations of the exhaust gas emission. Therefore, many researchers have been attracted to develop an early fuel evaporator(EFE) by introducing a ceramic heater for a solution of these problems in a gasoline engine. But, the performances of the EFE in a gasoline engine to reduce the exhaust gas emission and to improve the cold startability have not been clarified yet. The purpose of this study is to evaluate the feasibility of EFE with a ceramic heater during the warming-up period in a DOHC gasoline engine. By applying the EFE, the improvement of the cold startability as well as the reduction of the harmful exhaust gas emission has been accomplished in a gasoline engine.<br/>

물류진단 영업 시 간이물류비 산정방안

오영택 ( Young Taig Oh ),김종창 ( Jong Chang Kim ) 한국물류학회 2011 물류학회지 Vol.21 No.1

고비용, 저효율의 물류를 저비용(低費用), 고효율(高效率)의 물류로 전환하기 위해서 화주기업은 아웃소싱을 통한 제3자 물류활성화가 중요하고 물류기업은 한 차원 높은 물류서비스를 제공하여 화주기업의 원가절감은 물론 부가가치를 높이는 것이 중요하다. 이때 화주기업은 물류전문기업에서 제시한 물류혁신 제안내용, 특히 물류비절감 안을 보고 평가하게 된다. 물류혁신 제안을 위한 예비 진단은 영업수주의 첫 단계로 매우 중요한 과정이다. 물류 예비 진단 과정은 한정된 시간, 자료, 맨 파워 등 많은 제약 속에 수행된다. 그러면서도 짧은 기간 내, 보다 객관적이고 정확한 계량적 관리지표가 필요한데 그 중요한 관리지표 중 한 가지가 물류비다. 본 논문은 물류비산출활용의 연혁에서부터 기본을 정리하고 활용실태를 분석하였다. 그리고 물류업무 진단컨설팅 시 한정된 조건하에 간이적으로 물류비를 산정할 수 있는 기준을 제시하였다. 물류비 산출활용을 하지 않고 있거나 물류비에 대한 이해가 낮은 기업의 물류비를 간단히 파악할 수 있게 되었으며 파악된 물류비는 객관적인 관리 척도를 제공하는데 많은 도움이 되리라 본다. 또한 본 간이물류비산출방안은 물류관리수준을 파악하는 과정에서 다양하게 활용될 수 있으리라 본다. In order to break the logistics pattern of low-efficiency and high-cost and achieve highly-efficient, low-cost logistics system, it is necessary for shipper companies to activate 3PL logistics through outsourcing and for logistics companies to provide higher level of service so that the shipper companies can reduce costs and enhance added values. This is the moment when the shipper companies make an evaluation based on the proposals, especially on cost reduction strategies, made by professional logistics companies. The preliminary diagnosis for logistics innovation proposal is very crucial as the first step to win a contract. The diagnosis is usually carried out under a lot of restrictions, such as limited time, data, and man power. Despite the restrictions, more objective and more accurate quantitative management indexes are required, and one of the significant indexes is the logistics cost. This thesis reviewed basic concepts on application of logistics costing and analyzed actual uses of it. The criteria to simply calculate logistics costing under limited conditions were also suggested for cases of diagnostic consulting of logistics business. This enables the companies that do not use logistics cost calculations or the ones that have low understanding about logistics costing to easily apprehend logistics costing, and the understood cost will finally help the companies to have objective management criteria on their own. Also, the simple calculation for logistics costing suggested in this thesis will be able to be utilized in various ways in the process of assessing the degree of logistics management.

[연구실 탐방] 전북대학교 내연기관실험실

오영택(Young Taig Oh) 한국자동차공학회 2002 오토저널 Vol.24 No.2

Glow-Plug를 이용한 가솔린 연료의 조기증발 특성 실험 연구

문영호(Young-ho Moon),김진구(Jjin-goo Kim),오영택(Young-taig Oh) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.2

In order to reduce hydrocarbon emissions of spark ignition engine, it is important not only to improve catalyst conversion efficiency but also to reduce direct engine out hydrocarbon emissions, during cold starting and warm up process, Therefore many researchers have been attracted to develop an early fuel evaporator (EFE) by introducing a ceramic heater for a solution of engine out hydrocarbon emissions in SI engine. But, the performance of the EFE in MPI engine to reduce the exhaust emissions and to improve the cold startability has not been clarified yet. The purpose of this study is to evaluate the feasibility of a glow plug for EFE.

글로우플러그를 이용한 충돌분무의 미립화 특성에 관한 연구

문영호(Young-ho Moon),오영택(Young-Taig Oh) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.5

It is reported that during the cold starting. especially in gasoline engine, the engine response and the effect of HC emission can be improved by prompting atomization and reducing the quantity of fuel adhered to the range of injector tip, inlet port, and inlet valve.<br/> The purposes of this study are to promote atomization of fuel before air-fuel mixture in the inlet port. In order to achieve its goal, the glow plug is to evaluate the feasibility of for the early fuel evaporator and the spray behavior characteristics of gasoline, injected on the surface of glow plug with room temperature(20℃) and high temperature(250℃) is to examine. Particle motion analysis system(PMAS) was used to measure the SMD and the dropsize distribution of impinging spray and free spray,<br/> The results of this experiment, evaporation rate of impinging spray was higher than that of free spray, and the higher evaporation rate was, the smaller peak dropsize was. Especially, during early spray SMD of impinging spray was still smaller than that of free spray.

CRDI 방식 디젤기관에서 바이오디젤유 적용시 매연과 NOx의 동시저감에 관한 실험적 연구

최승훈,오영택,Choi, Seung-Hun,Oh, Young-Taig 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.3

Our environment is faced with serious problems related to the air pollution from automobiles in these days. In particular, the exhaust emissions of diesel engine are recognized main cause which influenced environment strong, In this study, the potential possibility of biodiesel fuel was investigated as an alternative fuel for a naturally aspirated common rail diesel engine. The smoke emission of biodiesel fuel 5vol-%(min. content) was reduced in comparison with diesel fuel, that is, it was reduced approximately 60% at 4000rpm, full load. But, power, torque and brake specific energy consumption didn't have no large differences. But, NOx emission of biodiesel fuel was increased compared with a commercial diesel fuel. Also, the effects of exhaust gas recirculation(EGR) on the characteristics of NOx emission has been investigated. It was found that simultaneous reduction of smoke and NOx was achieved with biodiesel fuel(5vol-%) and cooled EGR method($5{\sim}10%$) in a common rail diesel engine.

BDF 20을 사용하는 디젤기관들의 연소 및 내구특성

유경현,오영택,Ryu, Kyung-Hyun,Oh, Young-Taig 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.3

Three diesel engines were fueled with BDF 20, a blend of 80% diesel fuel and 20% biodiesel fuel by volume, and run in excess of 200 h to evaluate their combustion characteristics and durability. The engines used for this study were a 4-cylinder 2476-cc displacement IDI diesel engine(Engine 1), a 4-cylinder l732-cc displacement IDI diesel engine(Engine 2), and a single cylinder 673-cc displacement DI diesel engine(Engine 3). Engine dynamometer testing was performed on each engine at regularly scheduled intervals to monitor the performance and exhaust emissions, which were sampled at 1h intervals for analysis, The peak combustion pressure with BDF 20 increased in Engines 1 and 3 over that measured when burning pure diesel fuel, but that in Engine 2 remained constant. Combustion parameters, such as the maximum combustion pressure and corresponding crank angle, did not change over the long-term dynamometer testing. The BSFC with BDF 20 in Engine 1 was less than that measured with pure diesel fuel. The amount of smoke produced with BDF 20 was less for all engines ; the greatest reduction was observed for Engine 3. The NOx emissions were lower in the IDI engines than the DI engine. The traditional trade-off between smoke and NOx emissions was maintained for BDF 20 fuel for Engines 1 and 3. There was not a big difference in the $CO_2\;and\;O_2$ emissions for BDF 20, as compared to pure diesel fuel, but more $CO_2$ was exhausted by Engine 1 than by Engines 2 or 3 and less $O_2$ was exhausted by Engine 1 than by Engines 2 or 3. The engine parts remained clean, except for some carbon attached to the area surrounding the nozzle hole of the DI diesel engine.