• Title/Summary/Keyword: 디이젤

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Risk based benefit estimation according to replacement scenarios of CNG bus (천연가스버스 대체 시나리오에 따른 위해도 편익 평가)

  • 김예신;임영욱;이용진;신동천
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • 2002.11a
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    • pp.405-406
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    • 2002

  • 서울시 대기오염물질의 배출량 중 맡은 부분이 자동차 배출물질에 의한 것임은 잘 알려진 사실이다. 특히 이 중 디이젤 연료를 사용하는 자동차 배출량의 기여도가 가장 큰 것으로 알려져 있다 따라서 환경부에서는 디이젤의 대체 연료인 천연 가스를 시내 버스에 적용하여 점차적인 보급을 계획 중에 있다. 청정연료로 알려진 천연가스는 특히 입자상 물질이나 오존 등의 감소에 큰 역할을 하는 것으로 알려져 있다. (중략)

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A Study on the Diesel Spray by Means of Image Analysis of Shadow Photographs (陰影寫眞의 畵像解析에 의한 디이젤 噴霧의 硏究)

  • 장영준;신본무정;동경공
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.12 no.2
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    • pp.319-327
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    • 1988

  • A new measuring method is proposed, which measures the atomization characteristics of a non-evaporating, axi-symmetric diesel spray by means of an image analysis of high speed shadow photographs. The instantaneous sauter mean diameter and the fuel concentration in the spray are calculated of the splay axis and in the radial direction and the data of the fuel injection rate, using an onion peeling model. Some examples of application of this method to eight different diesel sprays are demonstrated, and the results are compared to predicted results by the conventional immersion method and a quasi-steady one dimensional spray model.

  • https://doi.org/10.22634/KSME.1988.12.2.319 인용 PDF

Effects of exhaust pipe curvature on the performance of a 4 cycle diesel engine (디이젤 엔진에서 排氣管 屈曲이 엔진性能에 미치는 影響)

  • 문병수;서정윤
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.10 no.5
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    • pp.735-741
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    • 1986

  • An experimental study on the effects of exhaust pipe curvature on the performance of a diesel engine is presented. The experiments were carried out on a 4-cycle, 216 c.c diesel engine and two types of pipe curvature, circular arc and rectangle, were tested. The shaft output, shaft torque and specific fuel consumption were obtained by inserting bent pipes of different dimensions into the exhaust pipe at various engine operation conditions. It was found that the engine performance was decreased by the circular arc bent pipe and the effects were dominated by its arc angle. The decrease of engine performance was minimized by the arc angle of 180.deg.. By the rectangle pipes the performance was more decreased and the effects were little influenced by its dimensions.

  • https://doi.org/10.22634/KSME.1986.10.5.735 인용 PDF