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A study on combustion characteristics using emulsified fuel in a diesel engine were performedexperimentally. In this paper, the experiments were performed at engine speed 1800rpm, emulsion ratios were 0%, 10%, 20%, and main measured items were specific fuel consumption, cylinder pressure, rate of pressure rise, rate of heat release etc.The obtained conclusions were as follows.1) Specific fuel consumption increased maximum by 19.8% at low load, but was not affected at full load.2) Rate of pressure rise and rate of heat release were about the same in the case of 10% and 20% of emulsion ratio.3) Cylinder Pressure increased 9.6%, rate of pressure rise increased 53.4% in case of emulsion ratio 20% at full load.4) Rate of heat release increased 72.4% in case of emulsion ratio 20% at full load.접수일 : 2007년 1월 20일, : 2007년 2월 22일임재근 : 군산대학교 동력기계시스템공학전공E-mail : jklim@kunsan.ac.kr Tel. 063-469-1845조상곤, 황상진, 유동훈 : 군산대학교 대학원