Improvement in engine thermal efficiency by reduction of in-cylinder heat transfer is the key objective of the on-going low-heat-rejection (LHR) engine research. This is to be accomplished by retaining within the cylinder the fuel energy normally lost to heat transfer and thus increasing the work done on the piston, as well as providing a higher temperature exhaust steam for energy recovery downstream.

The work reported here is directed at the needs of LHR engine R&D and has been sponsored by U.S.DOE and administered by NASA contract DEN 3-342, and by Oak Ridge National Laboratories contract 86X-22042V. This paper reviews the development and application of heat transfer methodology suited to low heat rejection engines. It also presents the results of an analytical study of translucence of engineering ceramics.


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