1408 非定常運動翼背面上に形成される再循環領域の構造

概要

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The streaklines of unsteady separation on unsteady airfoils, such as pitching and heaving airfoils, for Re=4.0×(10)^3 were visualized by dye flow visualization and schlieren visualization. Even in the low Reynolds number region at higher angle of attack where the separation occurred under the stationary condition, the re-circulation region was formed on the suction surface of a pitching airfoil with higher non-dimensional pitching rate and a heaving airfoil with higher non-dimensional heaving velocity. The re-circulation region consisted of a few discrete vortices. The scale of discrete vortices was about one fourth of the chord length and it did not depend on the airfoil configuration. The number of discrete vortex shedding during one pitching cycle in a pitching airfoil depended on the non-dimensional pitching rate and the vortex shedding frequency in a pitching airfoil was almost constant.
一般社団法人日本機械学会の論文
2003-08-05