Correlation between velocity and wall heat flux on a piston top in motoring mode of a tumble enhanced gasoline engine

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  • タンブル流強化ガソリンエンジンにおけるピストン頂面近傍の流動と壁面熱流束の相関

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<p>Heat transfer inside an engine has been studied for improving thermal efficiency by mitigation of the cooling loss. Flow near a piston top and heat flux on it were simultaneously measured with a microPIV and a MEMS thin film sensor in a motoring mode of an optical engine. It was confirmed that averaged heat flux over -15~15 CA deg. showed a positive correlation to the normal flow fluctuation, and that the instantaneous wall heat flux showed obvious correlation to the instantaneous normal velocity at 0.5 mm above the wall with a time lag of 200 s level. Moreover, a combination analysis of the wall parallel velocity and FFT spectrum of the heat flux showed that the fluctuation in the heat flux is composed of temperature unevenness of several millimeter scale and eddy motion of several hundred micrometer.</p>

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