Experimental investigation of the aerodynamic characteristics of a wing propulsion jets

With the intent to test the qualities of the theoretical models used in two different calculation methods, pressure distributions have been measured on a simple half model wing-in-jet combination. The position of the jets relative to the wing was varied, mainly in a plane perpendicular to the span. Jet velocities of 1, 2 and 3 times the tunnel...

Evaluation of a method for the prediction of jet-airframe interference

A brief description is given of a method, developed at NLR for the prediction of interference effects between (propulsion) jets and parts of airframes. The jet flow region is described by a model for a jet in a nonuniform mainflow, accounting for the presence of the airframe. The potential flow field around the airframe-jet combination is...

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...

Supersonic wind tunnel tests of eleven small aspect-ratio wings

The lift, drag and pitching moment characteristics of eleven small aspect-ratio half-wing models mounted on a reflection plate were determined in the range of Mach numbers fom 1.4 to 2.5 in the N.A.E. 10-inch supersonlc tunnel. Eight of the models were of the cropped delta type while the remainlng three had a cropped arrow plan form. Primarily,...