On the Response of Laminar Boundary Layers to Periodic Changes in Free-Stream Speed

An account is made of the cumulative experiences in an oscillating-flow wind tunnel concerning the direct forced response of laminar boundary layers to free-stream oscillations. The theory and experiment provide a level of confidence in the concepts. The existence of a periodic, jet-like phenomenon...

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Bibliographic Details
Main Authors: Morkovin,Mark V, Loehrke,Richard I, Fejer,Andrew A
Format: Report
Language:English
Subjects:
BOUNDARY LAYER TRANSITION
EQUATIONS OF MOTION
EXPERIMENTAL DATA
Fluid Mechanics
GAS FLOW
HOT WIRE ANEMOMETRY
LAMINAR BOUNDARY LAYER
OSCILLATION
PERIODIC VARIATIONS
RESPONSE
SUBSONIC CHARACTERISTICS
THEMIS PROJECT
THEORY
WIND TUNNELS
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Summary:An account is made of the cumulative experiences in an oscillating-flow wind tunnel concerning the direct forced response of laminar boundary layers to free-stream oscillations. The theory and experiment provide a level of confidence in the concepts. The existence of a periodic, jet-like phenomenon in a downstream-facing locally separated region was confirmed for amplitudes above an ill-defined threshold. By seeding controlled disturbances at arbitrary times and locations in the boundary layer a dichotomy in transition correlation is clarified. Report on V/STOL Oriented Aerodynamic Studies. Sponsored in part by Grant NSF-GK-17748.