Results of experimental and computational investigations of the flow around delta wings with both round and sharp leading edges are presented. The experiments were carried out for sub- and supersonic flows in the wind tunnel of the Aerodynamisches Institut of the RWTH Aachen. The laser-light-sheet technique together with smoke injection was used to visualize the details of the vortex structures developing, with increasing angle of attack, on the leeward side of two different delta wings: the ELAC 1 and a configuration with the same planform, but a sharp leading edge. The results indicate clearly the influence of the nose radius on the vortex formation. These investigations were completed by oilflow patterns. In the numerical simulation a solution of the parabolized Navier-Stokes equations was constructed with a space marching technique for three-dimensional supersonic flow. The computations were carried out for a freestream Mach-number Minfinite = 2. The computed vortex structures exhibit a remarkable similarity to those obeserved in the low speed experiments.
Investigation of vortex structures on delta wings
Untersuchung der Wirbelströmungsstrukturen an umströmten Detaflügeln
Zeitschrift für Flugwissenschaften und Weltraumforschung ; 20 , 2 ; 71-79
1996
9 Seiten, 13 Bilder, 21 Quellen
Article (Journal)
English
Raumfähre , Hyperschallgeschwindigkeit , Strömungsmessung , Windkanal , Tragflügelumströmung , Abreißen der Strömung , Überschallgeschwindigkeit , Laser , sichtbare Strömung , Rauch , Wirbelströmung , Anstellwinkel (Tragflügel) , geometrische Form , mathematisches Modell , Navier-Stokes-Gleichung , Maschennetz , Topologie , Vergleichsmessung , Strömungsmuster
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