Accession Number : AD0735967

Title :   Higher-Order Theory of Two-Dimensional Subsonic Wall Interference in a Perforated Wall Wind Tunnel.

Corporate Author : NATIONAL AERONAUTICAL ESTABLISHMENT OTTAWA (ONTARIO)

Personal Author(s) : Mokry,M.

Report Date : OCT 1971

Pagination or Media Count : 33

Abstract : The analytic solution for the interference velocity potential due to a source and a vortex between perforated wind tunnel walls has been extended to higher-order singularities. This allows a more accurate construction of the primary perturbation potential at the walls produced by the tested airfoil. The solution for the interference velocity at the position of the model is presented in the form of a series expansion, with Bernoulli polynomials of a suitably chosen function of wall porosity as coefficients. The discussion is limited to subsonic flow and a thin airfoil of small camber and incidence, placed midway between the perforated walls.

Descriptors :   (*WIND TUNNELS, *VORTICES), (*WALLS, SUBSONIC CHARACTERISTICS), TWO DIMENSIONAL FLOW, PERTURBATION THEORY, MATHEMATICAL MODELS, INTERFERENCE, AIRFOILS, VELOCITY

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE