Resumo

THIART, G.D.. Numerical lifting method for the determination of towing tank and wind tunnel corrections. R&D j. (Matieland, Online) [online]. 1999, vol.15, pp.35-40. ISSN 2309-8988.

A numerical lifting line method for the determination of the boundary corrections that have to be applied to the measurements of lift and induced drag on a wing tested in a towing tank or wind tunnel is presented. The method is an extension of the numerical lifting line method for high-speed free-surface and/or ground effect presented recently by the same author. As in this original method, the circulation distribution is expressed in terms of a Fourier sine series and no approximations are introduced to linearize the lifting line equations. Results from the numerical lifting line method and approximate linearized analytical solutions are compared for the practical case of a rectangular vjing at a small angle of attack. It is shown, for this specific case, that the required corrections for lift are of the order of 10% if the model wing span is about 0.8 times the width of the wind tunnel or towing tank, but that the side walls have negligible effect on the induced drag.

        · texto em Inglês     · Inglês ( pdf )