火花点火エンジン燃焼室たい積物の熱伝導率および熱拡散率に及ぼす潤滑油の影響〔熱工学, 内燃機関, 動力など〕

概要

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Thermal conductivity and thermal diffusivity of combustion chamber deposits in an s.i. engine have been measured for unleaded gasoline containing lubricating oil. The deposits were built-up on the surface thermocouples under different percentages of lubricating oil. After removing the sooted thermocouples from the engine, the thermal properties were determined by combination of several techniques which were established in a previous study. The results show that as a percentage of lubricating oil added in the fuel increases under a constant engine load, the wall temperature decreases, the deposit becomes thicker producing larger thermal diffusivity and smaller thermal conductivity. The results also show that as the engine load decreases under a constant percentage of lubricating oil in the fuel, the deposit exhibits the same tendencies as described above. The fact contrasts with the results in the case of no-lubricating oil that the engine load did not give any influence on the thickness, thermal conductivity, thermal diffusivity and heat capacity.
一般社団法人日本機械学会の論文
1998-06-25