Dynamic stall control by oscillatory forcing

D. Greenblatt, I. Wygnanski

Research output: Contribution to conferencePaperpeer-review

25 Scopus citations


A parametric study was undertaken to investigate the effect of oscillatory forcing (with zero net mass-flux) on an airfoil undergoing pitch oscillations at rotorcraft reduced frequencies. The primary objective of the study was to maximize the airfoil performance while simultaneously limiting moment excursions to typical pre-stalled conditions. The incidence angle excursions were limited to ±5° and a wide range reduced forcing frequencies and amplitudes were considered for Re<0.3×106 with various flap deflections and forcing locations. Significant increases in maximum lift and reductions in form drag were attained while simultaneously containing the moment excursions. Oscillatory forcing was found to be far superior to steady blowing and flap-shoulder forcing was found to be superior to leading-edge forcing.

Original languageEnglish (US)
StatePublished - 1998
Event36th AIAA Aerospace Sciences Meeting and Exhibit, 1998 - Reno, United States
Duration: Jan 12 1998Jan 15 1998


Other36th AIAA Aerospace Sciences Meeting and Exhibit, 1998
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Engineering(all)
  • Space and Planetary Science


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