一様流中の円柱のはく離点近傍伝熱特性の時空間的微細構造解明の研究

概要

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The separation point of a cylinder in a uniform oncoming flow moves upstream and downstream due to the Karman vortices far downstream in the wake. In contrast to studies and reports made so far on the time-averaged heat transfer performance around the cylinder, this paper aims at an experimental clarification of instantaneous and local heat transfer performances and an explanation of the relation of time / local performance and time-averaged performance, particularly in the vicinity of the separation point. Experiments were done using a heat flux sensor and an anemometer of triple fine wires for the measurement of unsteady surface heat flux and the flow field, respectively. Based on the measured results it is concluded that the separation point is found to move in the way of sinusoidal motion, which is somewhat modified by the fluctuation of the normal probability distribution. The measured time-averaged heat transfer performance near the separation point is shown to be well explained by the estimated instantaneous heat transfer coefficient distribution and the probability function obtained.
一般社団法人日本機械学会の論文
1988-09-25