The initiation, development, and shedding of vortices induced by sinusoidal airfoil motions were examined in the airfoil wake across a range of independent forcing parameters. Then, the interactions of these wakes with a following or trailing airfoil were studied. Coherent, phase-dependent, tandem vortex wake structures emerged from the shedding vorticity of the UPSTREAM OSCILLATING AIRFOIL. Consistent interactions of the vortex wake with a trailing airfoil were revealed with both the multiple-exposure, phase-locked, flow visualization measures and the time-dependent surface pressure measurements. Impingement of the tandem vortex wake upon the trailing airfoil produced unsteady pressure distributions resulting in very transient loading. Similar effects in unsteady loading were observed when an auto-rotating flat plate was used to create a vortex-dominated wake. These finding suggest that a consistent, structured wake produced by unsteady separation might be used to produce desired lift characteristics on a trailing, lifting surface. Keywords: Flow visualization, Dynamic loads, Vortices. (jhd)
Control of Wake Structure Behind and Oscillating Airfoil
1986
15 pages
Report
Keine Angabe
Englisch
Aerodynamics , Fluid Mechanics , Airfoils , Fluid control , Vortices , Wake , Consistency , Control systems , Dynamic loads , Flow visualization , Interactions , Aerodynamic lift , Lifting surfaces , Oscillation , Pressure distribution , Pressure measurement , Time dependence , Transients , Vortex shedding
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