Accession Number : ADP004167

Title :   Unsteady Separated Flow. Forced and Common Vorticity about Oscillating Airfoils,

Corporate Author : COLORADO UNIV AT BOULDER DEPT OF AEROSPACE ENGINEERING SCIENCES

Personal Author(s) : Robinson,M. C. ; Luttges,M. W.

Report Date : 1984

Pagination or Media Count : 10

Abstract : Flow perturbations induced through dynamic sinusoidal oscillations of an NACA 0015, NACA 0012, and flat plate were examined across a wide range of test conditions. Phase-locked multiple exposure flow visualization in conjunction with corroborative hotwire anemometry documented the development of temporally and spatially synchronus leading and trailing edge vortices induced through unsteady flow separation. Airfoil oscillation dynamics directly influenced vortex initiation, development and traversing velocities. The results suggest the existence of optimal combinations of variables for maximizing both vortex strength and residence time over the airfoil. (Author)

Descriptors :   *Unsteady flow, *Flow separation, *Vortices, Perturbations, Trailing edges, Leading edges, Attachment, Airfoils, Flat plate models, Oscillation, Harmonics, Flow visualization, Hot wire anemometers

Distribution Statement : APPROVED FOR PUBLIC RELEASE