The potential benefits from the use of high-temperature ceramic materials and insulation in four- and two-stroke marine diesel engines were investigated with the aid of computer simulation. The characteristics of engineering ceramic materials for high- temperature applications are briefly described and the engine process simulation models used are outlined. If the engine combustion space is insulated, the heat rejected to the coolant is reduced. This allows a reduction in the cooling required by the engine but also leads to increased combustion chamber wall temperatures. The ability of some engineering ceramics to withstand higher temperatures than conventional metals, combined in some cases with higher thermal resistance, makes them attractive for such applications. A small part of the energy formerly rejected to the surroundings is transformed into some extra reciprocator work, thus improving the energy available for waste-heat recovery. Four-stroke engines suffer from volumetric efficiency loss because of charge air heating from the hotter combustion space components. Two-stroke uniflow engines are much less affected by this problem and thus they are more suitable for the use of insulation. The performance of an insulated two-stroke uniflow-type large marine engine was investigated in more detail using the engine simulation model by varying the level of insulation of individual components, optimizing the turbocharger match and including a power-recovery turbine.

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  • Publication Date: 1988

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  • Accession Number: 00657779
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM