On the Effects of the Tunnel Wall Interference and the Wall Boundary Layer in the Airfoil Cascade Test

Abstract

This paper deals with the theoretical calculation of the wind tunnel interference in the cascade tests under the assumption of two-dimensional potential flow and then with the interference of the wall boundary layer upon the turning angle of flow in the cascade. Part I contains the theory of the wind tunnel wall interference upon the turning angle and Part II, the theory of the tunnel wall interference upon the air foil characteristics in the cascade composed of air foils having arbitrary shapes. A numerical example is shown in the case of cascade composed of N.A.C.A. 6409 and compared with some experimental results. Finally, Part III contains the methods of calculating the wall boundary layer effects upon the turning angle.