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배명환(M.H.Bae),임재근(J.K.Lim) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The effect of exhaust gas recirculation(EGR) on the characteristic of NOx emissions has been investigated using an eight-cylinder. four cycle. direct injection diesel engine operating at several loads and speeds. The theoretical NO formation concentration is calculated with the equivalence ratio as a parameter of flame temperature to study the effect of EGR on NOx emissions in the diesel combustion. The experiments in this study are conducted on the fixed fuel injection timing of 38˚ BTDC regardless of experimental conditions. It is found that the specific fuel consumption rate is slightly increased with EGR rate. and NOx emission is markedly reduced owing<br/> to the drop of the incoming oxygen concentration and the increase of equivalence ratio as the EGR rate increases.<br/>
농용 디젤기관에 있어서 미강유 연료의 배기 배출물 특성
배명환(M.W Bae),김형만(H.M Kim) 한국자동차공학회 2000 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The effects of rice bran oil on the characteristics of performance and exhaust emissions have been experimentally examined by a single cylinder, four cycle, direct injection, water-cooled and agricultural diesel engine operating at several loads and speeds. The experiments are conducted with light oil, blends of rice bran with light oil, and rice bran oil as a fuel. The fuel injection timing is fixed to 22" BTDC regardless of fuel type, engine loads and speeds. Any oxygen is not included in light oil, while the oxygen contents of 10.7% are included in rice bran oil. The lower calorific value of rice bran oil is less than light oil, and the viscosity is very high compared with light oil. In present study, it is found that these major differences of chemical and physical properties control the combustion parameters that affect the performance and exhaust emissions of diesel engines using a rice bran oil as fuels.<br/> <br/>
[디젤엔진부문] 디젤기관의 피스톤 및 피스톤링 마모에 미치는 재순환 배기의 영향
배명환(M.W.Bae),하정호(J.H.Ha),임기창(K.C. Im) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
The effects of recirculated exhaust gas on the wear of piston and piston rings were investigated by the experiment with a two-cylinder, four cycle, indirect injection diesel engine operating at an engine load of 75% and an engine speed of 1600 rpm. For the purpose of comparison between the wear rates of two cylinders with and without EGR. the recirculated exhaust gas was sucked into one of two cylinders after the soot contents in exhaust emissions were removed by an intentionally designed cylinder-type scrubber equipped with 6 water injectors(A water injector has 144 nozzles of 1.0 mm diameter>, while only the fresh air was inhaled into the other cylinder. These experiments were carried out on the fuel injection timing fixed at 15.3' BTDC. It was found that the wear rate of piston skirt with EGR increased a little bit, but the piston head diameter increased, rather than decreased, owing to soot adhesion and erosion wear, and especially larger with EGR, and that the wear rates of the top and second piston ring( compression ring) thickness with EGR were more than twice the wear rate of top ring in case of no EGR, but the wear rate of oil rings thickness without EGH increased greater than that with EGR
EGR과 수분효과에 의한 디젤엔진의 NOχㆍSoot 동시저감기술
박태인(T. I. Park),박권하(K. Park),하정호(J. H. Ha),배명환(M. H. Bae) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
Over the past years, many research works have been carried out to investigate the factors which govern the performance of diesel engine. The area of study has been focused on reducing NOχ Soot from diesel exhaust gas, because of the trade-off relations between these two components. One of the efforts is developing EGR technology to reduce NOχ emission. That is very effective in reducing NOχ but makes other emissions and economy worse.<br/> As an alternative way. the technology using EGR with micro-explosion effects is introduced and tested in this work. In order to supply water vapor into a combustion chamber, employed is Scrubber system which sprays water on recirculating gas. The results showed a tendency of reducing both NOχ and soot simultaneously.<br/>