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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/>
배명환(M.W.Bae),임재근(J.K.Lim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The effects of recirculated exhaust gas on the characteristic of soot emissions have been examined with EGR rate using an eight-cylinder, four-stroke, direct injection and water-cooled diesel engine operating at several loads and speeds. The experiments in this study are carried out at the fixed fuel injection timing of 38° BTDC regardless of experimental conditions. The intake oxygen concentration and equivalence ratio calculated on the average by the intake air flow and fuel consumption rate are applied to analyze and discuss the influences of EGR rate on soot emissions. Results of this study indicate that soot emissions increase owing to the drop of intake oxygen concentration and the rise of equivalence ratio as the EGR rate increases at a given engine speed, especially the high load.<br/>
연소기관의 매연생성과정 모델링용 고온ㆍ고압 정적연소장치의 개발
배명환(M. W. Bae),최낙정(N. J. Choi),이승규(S. K. Lee) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
A constant-volume combustion chamber with disk-type is developed to study the soot formation process under high temperatures and 'pressures. The premixed fuel rich propane-oxygen-inert gas mixture is simultaneously ignited by eight spark plugs located on the circumference of combustion chamber with 45 degree intervals. The eight converging flames compress the end gases to high pressures. The advantages of this experimental approach with symmetrically converging names are as follows; first, the history of soot formation process with time during high temperatures and pressures can be measured because the premixture in the observation field of combustion chamber is burned with a nearly constant pressure at the final stage of combustion process and the burnt gases of the observation region rarely flow in the chamber; and secondly, the combustion conditions during soot formation process can be arbitrarily changed because the combustion pressure and burnt gas temperature are easily varied by the initially charged pressure, and by the volume fraction of inert gas and oxygen concentration in the premixture, respectively.
[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