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정동원(Dongwon Jung),이병석(Byeongseok Lee),손진욱(Jinwook Son),우수형(Soohyung Woo),김영남(Youngnam Kim),오희창(Heechang Oh),한동희(Donghee Han) 한국연소학회 2019 KOSCOSYMPOSIUM논문집 Vol.2019 No.5
This study demonstrates on the technologies for the development of gasoline engine to improve brake thermal efficiency. All experiments have been conducted for stoichiometric operation at 2000RPM. The test engine is a four-cylinder 2.2L GDI engine, which has a long-stroke concept (102mm stroke and 79mm bore). The effects of compression ratio, EGR rate, the number of spark plugs, tumble ratio and super charger were explored. As a result, the maximum brake thermal efficiency can be achieved up to 44.6%.
정적연소실에서 마이크로파 보조 플라즈마 점화가 화염핵 생성과 발달에 미치는 영향
황준식(Joonsik Hwang),김우영(Wooyeong Kim),박주호(Juho Park),배충식(Choongsik Bae),박주영(Jooyeong Park),최원호(Wonho Choe),차정화(Jeonghwa Cha),우수형(Soohyung Woo) 한국자동차공학회 2017 한국 자동차공학회논문집 Vol.25 No.6
In this study, effects of microwave ejection on flame formation and development was investigated in a constant volume combustion chamber. The new ignition system was consisted with a commercial magnetron(2.45 GHz, 700 W) from a microwave oven, a mixing unit, a directional coupler, and a non-resistor spark plug. A series of experiments was performed under various equivalence ratio, ambient pressure and microwave ejection timing. The experimental results showed that microwave-assisted plasma ignition improved flame speed up to 20 % under the lean air-fuel condition. The lean limit could also be extended up to 0.5 with new system. However, enhancement was limited to lean and low initial ambient air condition. In terms of microwave ejection timing, an early microwave ejection strategy showed better combustion characteristics.