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A number of starting flows past a fixed or pitching airfoil at large incidences are investigated by means of experimental and numerical visualizations. The study is concerned with two-dimensional incompressible cases in which the flow is initiated by an impulsive motion around an elliptic airfoil at chordal Reynolds numbers smaller than 10 4. The main object of the research is to reveal phenomenologically some marked characteristics of the unsteady airfoils in the so-called deep stall regime in comparison with those in the light regime. Another definite purpose is to examine, in some detail, the respective and combined effects of the major experimental parameters on the vortex formation and wake development around the airfoil. It will be shown that the wakes of the fixed airfoil at large incidences bear some analogy to those of a flat plate at incidence.

Visualization of the flow past a fixed or pitching airfoil at large incidences.