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커먼레일 연료 분사시스템을 이용한 DME DI 기관의 성능과 배출가스특성에 관한 최적화 연구
양세문(Seemoon Yang),전상엽(Sangyecp Chun),이영재(Younjae Lee),김영길(Yonkil Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Dimethyl Ether(DME) seems to be one of the most attractive alternative fuels for heavy-duty engines. Many researches and developments have been carried out on DME engines. However, the principal technical problems have not yet been solved. One problem is related to finding safety fuel supply systems able to suppress vaporizations. To search for these systems, we have studied optimization of injection equipment in terms of the relation between performances and emission characteristics by using Common rail injection systems. We found that thermal efficiency and emission is satisfactory when the engine is operated at 50MPa, 14 degree BTDC main injection. Also, when the pilot injection by common rail is 10% at total injection, 40 degree BTDC, NOx emission reduced up to 30% and than only main injection. And the Brake thermal efficiency is optimum when the nozzle needle lift 0.21mm for test engines.<br/>
우상균(Sanggyun Woo),표영덕(Youngdug Pyo),이영재(Younjae Lee),이충원(Choongwon Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Dimethyl ether(DME) is an oxygenated fuel with a cetane number higher than that of diesel oil. It meet the ULEV emission regulation and reduce the smoke to almost zero when used in a diesel engine. Cogeneration is an energy conversion process, where electricity and useful heat are produced simultaneously in one process. Also, carbon dioxide emissions can be substantially reduced. Cogeneration heat can be used either for district heating or for industrial processes. Furthermore, the heat by-product is available for use without the need for the further burning of a primary fuel. The cogeneration process may be based on the use of steam or gas turbines or combustion engines. However, there have been few models with an output of less than 100 kilowatt. In the present study, conventional DI diesel engine by using DME fuel with generation output of 25 kilowatts was developed for micro cogeneration package. Test results showed that the torque and power with DME were same as those of pure diesel oil, but the brake thermal efficiency decreased a little. Also, smoke index from DME engine showed nearly zero level and NOX was decreased a little compared to diesel oil. The EGR system was the very effective method to reduce the NOX emission in case of DME fuel in diesel engine.