渦発生体による平板層流境界層熱伝達の促進

概要

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The enhancement of heat transfer caused by the presence of a single vortex generator in a laminar boundary layer was experimentally investigated. The local heat transfer coefficients just downstream of the vortex generator and the mean and fluctuation component of velocity were measured. A substantial increase in the heat transfer was noticed, with a maximum improvement of the heat transfer coefficient of 80 %, even in regions where the laminar structure was clearly predominant. It was observed that the heat transfer coefficient presents two peaks in the spanwise direction, each one associated with different vortices. The corner longitudinal vortex, which arose in the generator's front corner, was found to be associated with one of these peaks. The effects on the heat transfer of varying the generator's size, angle of attack and geometry were clarified.
社団法人日本機械学会の論文
1990-10-25