• Title/Summary/Keyword: Pre-post injection timing

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Effect of pre-post injection timing of diesel fuel for naval vessel on the combustion and emission characteristics in an optically-accessible single cylinder diesel engine (단기통 디젤엔진에서 함정용 디젤유의 전·후 분사시기가 연소 및 배출가스 특성에 미치는 영향)

  • Lee, Hyungmin
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.7
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    • pp.868-876
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    • 2014
  • The objective of this study is focused on the analyzing combustion, carbon monoxide and hydrocarbon emission characteristics of marine diesel oil, utilized for naval propulsion engine, with varying pre-post injection timing of an optically accessible single cylinder engine. And also the combustion process is analyzed by means of a high speed camera visualization. On the result of retarding pre-injection timing toward main 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 and hydrocarbon are reduced in this case. In hence, when a post-injection timing is advanced, the mean effective pressure and maximum pressure are increased, because the combustion has been performed under the high temperature and high pressurized environment during main injection time, and the emission rates of carbon monoxide and hydrocarbon are increased. From the experimental results, it considered that retarding of pre-injection timing affects to shorten the ignition delay of main injection clearly, and to raise the flame intensity comparing to the advanced state. The ignition delay during post-injection is not appeared at any post-injection time, but the flame intensity has been weakened gradually according to the retarding of post-injection timing.