遮熱率の大きい遮熱形セラミックエンジンの研究

概要

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In order to eliminate the cooling system from all internal combustion engine, we studied heat-insulated construction of an engine. It is very difficult to increase the heat-insulation rate to above 50% in a heat-insulated engine having a combustion chamber wall coated with a zirconia layer. Heat flux and temperatures have been calculated by means of the finite-element method. Calculated results are compared with the measured temperatures in an engine which has a combustion chamber wall made of silicon nitride and a compound heat-insulated construction composed of an air gap and a gasket with very low thermal conductivity. We obtained the results that the compound heat-insulated construction is very effective in reducing heat flow from the combustion chamber wall to the outer cylinder made of cast iron. The calculated results show good correspondence with the measured data when large heat-transfer coefficients are used for the piston when fuel is burning briskly, and when low heat-transfer coefficients are employed on the cylinder liner in contact with the combustion gas.
一般社団法人日本機械学会の論文
1993-12-25