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Correction of downwash in wind tunnels of circular and elliptic sections

Irmgard Lotz

Abstract

The downwash velocity distribution behind the wing was determined for the free jet and for the closed tunnel of both circular and elliptic cross sections. The wing was placed at the center of the tunnel. The theory makes it possible to determine the downwash at any point in the jet. The computations were performed for points in the plane determined by the jet axis and the center-of-pressure line of the wing. The downwash proved to be proportional to the wing lift and inversely proportional to the cross-sectional area of the tunnel.

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Key concepts: Downwash, Wing, Wind tunnel, Physics, Jet (fluid), Lift (data mining), Geometry, Point (geometry)