단기통 디젤엔진에서 함정용 디젤유의 전·후 분사시기가 연소 및 배출가스 특성에 미치는 영향

Abstract

The objective of this study is focused on the analyzing combustion, carbon monoxide and hydrocarbonemission characteristics of marine diesel oil, utilized for naval propulsion engine, with varyingpre-post injection timing of an optically accessible single cylinder engine. And also the combustion process isanalyzed by means of a high speed camera visualization. On the result of retarding pre-injection timing towardmain injection timing, the mean effective pressure and maximum pressure of combustion chamber are increased;however, the heat release rate is decreased. Furthermore, the emission rates of carbon monoxide andhydrocarbon are reduced in this case. In hence, when a post-injection timing is advanced, the mean effectivepressure and maximum pressure are increased, because the combustion has been performed under the hightemperature and high pressurized environment during main injection time, and the emission rates of carbonmonoxide and hydrocarbon are increased. From the experimental results, it considered that retarding of pre-injectiontiming affects to shorten the ignition delay of main injection clearly, and to raise the flame intensitycomparing to the advanced state. The ignition delay during post-injection is not appeared at any post-injectiontime, but the flame intensity has been weakened gradually according to the retarding of post-injection timing.