Experimental Investigation on the Boundary-Layer Flow over a Rotating Cone-Cylinder Body in a Uniform Stream

Abstract

The pressure distribution and the boundary-layer flow on the surface of rotating cones or cone-cylinders having vertex angles of 15°and 30° in a uniform stream were measured, and the effects of the vertex angle, the velocity of uniform stream and the presence or lack of a cylindrical body were studied. It was concluded that the pressure on the rotating cone is not changed by the velocity of the uniform stream and the rotation, and the pressure over the rear part of cone decreases when the cylinder body is present. The relation between velocity components u and v in the boundary-layer depends upon the ratio (λ) of the circumferential velocity to the velocity of uniform stream. But the curves expressed by this relationship are similar for the same value of λ and independent of the vertex angle, the presence of lack of cylinder body, and the laminar of turbulent state. The value of λ at the transition point increases as the vertex angle and the negative pressure gradient increase.