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Unsteady Surface Flow Behavior on a Cascade of Airfoils Oscillating Below Stall.
Technical rept. Mar-Sep 75,
PURDUE UNIV LAFAYETTE IND PROJECT SQUID HEADQUARTERS
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Tests have been performed on a cascade of airfoils oscillating in pitch using hot films to detect unsteady changes in the flow over the suction surface. It was found that unsteady transition from laminar to turbulent flow propagates forward along the chord and that unsteady reattachment propagates rearward. At low incidence angle the turbulent flow region does not reach the leading edge, and at higher incidence angle the laminar flow region does not extend rearward beyond mid chord. Author
APPROVED FOR PUBLIC RELEASE