The flow past a delta wing of aspect ratio one is examined at angles of attack ranging from 25 to 90 deg. On the basis of detailed observations of the flow in a water channel, using laser-induced fluorescence, four angle of attack flow regimes are identified, in addition to the well known regime of a stable pair of leading edge vortices. These are: a regime where the two leading edge vortices break down independently, primarily into the spiral form; a regime where spiral and bubble breakdowns alternate periodically on the two sides of the wing, accompanied by an antisymmetric motion in the chordwise direction of the two points of breakdown; a regime where a single streamwise vortex springing from the wing apex alternates in sign at irregular intervals; and finally a regime dominated by a wake bubble and the relatively small scale vortices arising from the instability of its boundary.
Slender delta wing at high angles of attack - A flow visualization study
Schlanke Delta-Fluegel bei grossen Anstroemwinkeln: Untersuchungen zur Sichtbarmachung der Stroemung
AIAA-Papers ; Jul ; 1-16
1987
16 Seiten, 9 Bilder, 11 Quellen
Conference paper
English
Flow Control over a Maneuvering Delta Wing at High Angles of Attack
Online Contents | 1996
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