A-321 定常流から振動流への臨界レイノルズ数における鈍頭円柱周り流れ全体安定性解析

概要

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It is known that the flow around an ellipsoid at angle of attack becomes steady asymmetric flow at a Reynolds number (based on the length) of approximately 5000. The results of the global stability of the steady asymmetric flow show that the asymmetric flow is stable. At higher Reynolds number, the flow changes from a steady asymmetric flow to an oscillatory flow. In this paper, the flow around a blunted cylinder at angle of attack of 0 degrees to 10 degrees was calculated. In the case of the blunted cylinder, the separation line of the recirculation region is fixed at the edge of the flat base. At this point, the flow around the blunted cylinder is different from the flow around an ellipsoid. The results show that the flow changes from an axisymmetric flow to an asymmetric flow and generates lift at angle of attack of 0 degrees. However, the flow remains symmetric at non-zero attack angles. The Lift-drag ratio changes according to the variation of the Reynolds number.
日本流体力学会の論文
2003-07-28