0703 傾斜した平板翼から発生する空力音と後流渦の関係 : 物体直後のスパン方向流れの影響(OS7-1 流れと音,オーガナイズドセッション)

概要

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The three dimensional structure of the wake vortex was investigated in relating to the aeolian tone from the inclined flat blade, which is installed in the uniform flow from zero to thirty degree of the inclined angles with upper and lower wall. It was pointed out that the aeolian tone becomes large at ten degree of the inclined. At small inclined angle, the formation of wake vortex is occurred at the same time in wide span location. The scale of the wake vortex in span direction becomes large at small inclined angles. The span wise correlation of the wake vortex at zero inclined angle is only restricted near the position of the vortex formation, but the correlation at small inclined angle is spread in span direction and becomes large. At the large inclined angle, the formation of wake vortex starts near the lower corner of the blade and this is traveled toward to the upper side of the blade. The structure of the wake vortex is weak and does not have strong periodicity. Then the correlation of wake vortex becomes small with the inclined angle.
2009-11-06