受動吹出し制御による翼面摩擦抵抗低減の風洞実験

抄録

Friction drag reduction effect of a passive blowing on an airfoil is investigated experimentally. The passive blowing is driven by the pressure difference on the surface between the leading edge and the rear part of the upper surface. The Reynolds number based on the chord length is 6.45 × 10⁵ and 1.55 × 10⁶. The angle of attack is set to 0° and 6°. The streamwise mean velocity profile in the blowing region is shifted away from the wing surface. This behavior qualitatively suggests reduction of friction drag by the passive blowing. As a result of a quantitative assessment, which evaluates the effects of pressure gradient and the roughness of the wall caused by the perforated metal plate used for blowing, it is confirmed that the passive blowing reduces the local friction drag by 4% - 23%.