直接噴射式ディーゼル機関における燃焼室の保温性と排気特性

概要

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In a small direct-injection diesel engine (bore : 86 mm, stroke : 90 mm), effects of heat insulation of the combustion chamber on engine performance (fuel consumption, nitric oxide, amount of unburned HC and exhaust smoke characteristics) were investigated by changing the combustion chamber materials, by inserting a teflon sheet between the piston body and piston crown and by creating an air gap behind the combustion chamber. The effect of heat insulation on the surface of the combustion chamber was the greatest for ceramics and next greatest for the case of teflon sheet insertion. The HC concentration with increasing heat insulation decreases about 15% under light load and medium load but increases under high load due to changes in the combustion pattern. The effect of heat insulation on smoke and fuel consumption characteristics is small under light load but large under high load. The smoke and fuel consumption characteristics under high load deteriorate with increasing heat insulation.
一般社団法人日本機械学会の論文
1995-05-25