Theoretical predictions based on the marching technique are compared with experimental observations on an airfoil with a concave region. Theoretical predictions of the wavelength of the most amplified Goertler vortex are in excellent agreement with the experimental observations for the range of chord Reynolds numbers from 1.0 to 3.67 million. In the convex zone, solutions from the marching technique showed that the initial counter-rotating vortex pairs lift off the surface and dissipate while another layer of vortex pairs of opposite rotation develops near the surface. This confirms the experimentally observed double peaked streamwise velocity perturbations. Furthermore, the streamwise velocity perturbations which dominate spanwise variation in the surface shear stress distribution shift by half a wavelength in the convex region. The experimental flow visualization photographs clearly confirm this phenomena.
Goertler instability on an airfoil: Comparison of marching solution with experimental observations
Die Goertler Instabilitaet auf einem Tragfluegel: Vergleich einer schrittweisen Loesung mit experimentellen Beobachtungen
1989
16 Seiten, 25 Bilder, 35 Quellen
Aufsatz (Konferenz)
Englisch
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