Correction for wall interference in a solid-wall wind tunnel using sparse measured boundary conditions

A method is described, which is the result of further work on a measured boundary condition method developed at NLR, aiming at on-line application. The method requires a minimum of measured tunnel-wall pressures and applies a fast algorithm for the calculation of the wall interference. Some numerical test results are discussed.

Evaluation of measured-boundary-condition methods for 3D subsonic wall interference

Measurements on a simple aircraft model in both an appropriately sized and a relatively large, low-speed, solid-wall test section were used to analyse the accuracy and consistency of measured-boundary-condition (MBC) methods. For completeness, the classical method of images, with two different correction procedures, was also analysed. For the...

Evaluation of a potential theoretical model of the wake behind a wing via comparison of measurements and calculations

The present report considers the validity of the representation of the wake by discrete trailing vortices as is common practice in potential theoretical calcualtions. Theoretical results, obtained with a method developed at NLR, are compared with experimental results obtained at NLR for a 30° swept back wing. The shape of the vortex sheet as...