Fundamental studies on the control of turbulent boundary layers. Experimental investigations of the effect of convex curvature on boundary layer characteristics.

Abstract

Boundary layer velocity characteristics for different curvatures are compared experimentally, and the parameters which include the effects of convex curvatures are analyzed. The shape-factor of velocity defect profile G is determined to be a significant parameter which control the convex turbulent boundary layer velocity characteristics. And the skin friction formula by Ludwieg-Tillmann is satisfied for any size of convex curvature adopted in this report. The problem of the turbulent characteristics, it is cleared that a parameter, μ2pw/(R·g) is important to detemine the effects of convex curvatures.