Accession Number : AD0778378

Title :   Wall Interference on Two-Dimensional Supercritical Airfoils, Using Wall Pressure Measurements to Determine the Porosity Factors for Tunnel Floor and Ceiling.

Descriptive Note : Aeronautical rept.,

Corporate Author : NATIONAL AERONAUTICAL ESTABLISHMENT OTTAWA (ONTARIO) HIGH SPEED AERODYNAMICS SECTION

Personal Author(s) : Mokry,M. ; Peake,D. J. ; Bowker,A. J.

Report Date : FEB 1974

Pagination or Media Count : 44

Abstract : The effects of unequal porosity factors, ascribed to the floor and ceiling of two-dimensional wind tunnel test sections, are investigated with a simplified mathematical model that utilizes a point vortex and a point doublet placed mid-way between the two walls. Closed form solutions are derived, using the method of images for wall pressure distributions, and corrections to Mach number and model angle of attack.

Descriptors :   *Wind tunnel tests, *Walls, *Porous materials, Interference, Ceiling, Supercritical airfoils, Porosity, Flow fields, Theory, Vortices, Perturbation theory, Equations of motion, Canada

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE