G111 LEBUを用いた壁面噴流の抵抗低減の試み(G-11 流れの抵抗低減(1),一般講演)

概要

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An experimental study has been made on the management of a stronger wall jet by means of large-eddy break-up device (LEBU). The non-disturbed plane turbulent wall jet was adjusted to be self-preserving under a constant velocity ratio Um/Ue=4. A NACA0012 wing was located at the height at which the mean velocity profile has a inflexion point and mean velocity, Reynolds stresses and the wall shear stress were measured over relaxation process. The local skin friction coefficient is reduced over the streamwise distance almost 50 times wing cord length. By taking account of drag of the wing, rate of net drag reduction to the total shear stress over the streamwise extent is estimated to be 7%. Effect of the manipulator on the mean velocity and Reynolds shear stress distributions near the wall at immediately downstream locations suggests that turbulent structures are closely related between near the wall and the outer layer.
日本流体力学会の論文
2004-08-09