Unsteady flows produced by a periodically deforming airfoil leading edge (PDLE) was examined in detail. This configuration allows for reduced form drag while producing vortex structures which promote flow re-attachment past static stall angles. Flow visualization was used to show the flow structures that formed due to PDLE deployment and hot-wire anemometry allowed the associated vorticity production to be evaluated throughout the cycle. The present studies provide evidence for optimal vortex production rates. Within the range of test conditions used, a reduced frequency of 2.0 yielded flow field re-attachment that was more complete than produced by reduced frequencies of 1.0 and 2.5. The hypothetical underlying mechanisms supporting these phenomena are discussed.
Unsteady separated flows driven by periodic leading edge deformation
Durch periodische Verformung der Leitkante erzeugte instationaere Stroemungsabrisse
AIAA-Papers ; Jul ; 1-14
1987
14 Seiten, 10 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
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