動的失速時の翼周辺はく離流と非定常空気力に関する研究 : 第2報,数値解析ーその2

抄録

The stalling characteristics of 15% thickness elliptic airfoils in incompressible turbulent flows at a Reynolds number of 5×10⁵ are investigated numerically by solving the Reynolds equations and the boundary-layer equations. Calculations were performed on the airfoils impulsively started at high angles of attack and oscillating in pitch with large amplitude. The development of the separated flows and the behaviour of the forces are studied in terms of patterns of streamlines, vectors of velocity and lines of constant vorticity, and normal force and moment coefficients it is observed from the results that the separated flows over impulsively started airfoils at high angles of attack show oscillatory behaviour.