Wall interference in wind tunnels of closed rectangular section: development of equations

Supplement to AR 7. This report is supplementary to a paper on "Wall Interference in Wind Tunnels of Closed Rectangular Section" (N.R.C. Report AR-7). Assuming lifting-line theory, expressions for the velocity induced by the walls at points along the span of a wing are derived for symmetrical aerofoils with arbitrary lift distribution. These...

Wall interference in wind tunnels of closed rectangular section

In this report, theories of the wall interference on aerofoils and symmetrical bodies in wind tunnels of closed rectangular section are reviewed and extended. In Part 1, exact and general expressions are derived, on the basis of lifting-line theory, for the interference on the lift, drag, lift distribution, and rolling and yawing moments of an...

Wind tunnel corrections in ground-effect tests

This report considers the effect of the walls of a closed rectangular wind tunnel on the aerodynamic forces experienced by an aircraft model mounted close to the tunnel floor. This mounting position is used in determining the "ground-effect" on an aeroplane flying close to the ground. Previous results for the effect of the walls on the angles of...