ディーゼルエンジン燃焼室たい積物の熱伝導率および熱拡散率の測定

概要

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Thermal conductivity and thermal diffusivity of combustion chamber deposits in a diesel engine have been measured as fundamental data for heat transfer analyses. The deposits were built-up on the surface thermocouples under different engine loads, speeds and locations. After removing the sooted thermocouples from the engine, the thermal properties were determined by the combination of several techniques which were established in a previous study. The results show that thermal diffusivity is 2.0〜3.4×10^-6m^2/s without clear dependencies on engine loads and locations. It is also shown that thermal conductivity is influenced by the engine loads resulting in 1.50〜1.84W/(m・K) at 80% load and 1.14〜1.41W/(m・K) at 60% load. This fact contrasts with the previous results for s.i. engine deposits whose thermal conductivity does not depend on engine loads. It is also found that that the thermal conductivity of the diesel engine deposits is larger in most cases than that of the s.i. engine deposits which is 1.06〜1.21W/(m・K).
一般社団法人日本機械学会の論文
2000-11-25