薄膜型熱流束計の高精度化に関する研究 (エンジンピストン部での検討)

概要

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An internal combustion engine is demanded to be higher efficiency from the viewpoint of environmental problem. For the high efficiency, the gas flow is introduced into combustion chamber. The introduction of the gas flow promotes combustion. But the gas flow increases the heat transfer between combustion gas and combustion chamber walls. It is said to measure correct heat fluxes in an engine, body material of a heat flux probe should be used same material as combustion chamber. However, it is proved that correct heat fluxes can be measured using probe material of a heat flux probes is different from a cylinder liner in the experiments with a constant volume vessel. But the experiments are not taken account of the stationary part of heat flux. Then, the heat flux measurements are carried out with the engine. The thermal conductivity of the material has a great influence on the surface temperature at the piston. As a result by S45C-Ni heat flux probes is same as that by the Cu-Con heat probes whose bodies are different from a combustion chamber wall of the engine.
2009-09-30