Effect of Boundary Layers on Solid Walls "in Three-Dimensional Subsonic Wind Tunnels in Three-Dimensional Subsonic Wind Tunnels

Abstract

A solution for the solid blockage and lift interference caused by the boundary layers on solid walls in subsonic wind tunnels is presented. This solution results from a linear treatment similar to that for wind tunnels ventilated with longitudinal slots. The dynamics of the boundary layer is modeled with the von Karman momentumintegral equation. The analysis leads to a viscous boundary condition which is a linear function of the inviscid velocity potential and enters the solution only as a change in boundary condition for the inviscid solution. The wall boundary layer primarily affects the solid blockage and streamline curvature interference factors, with the viscous layer reducing solid blockage in a manner similar to opening longitudinal slots in the walls.