Accession Number : AD0737856

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

Descriptive Note : Scientific interim rept.,

Corporate Author : ILLINOIS INST OF TECH CHICAGO DEPT OF MECHANICAL AND AEROSPACE ENGINEERING

Personal Author(s) : Morkovin,Mark V. ; Loehrke,Richard I. ; Fejer,Andrew A.

Report Date : AUG 1971

Pagination or Media Count : 56

Abstract : 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.

Descriptors :   (*LAMINAR BOUNDARY LAYER, PERIODIC VARIATIONS), GAS FLOW, OSCILLATION, RESPONSE, BOUNDARY LAYER TRANSITION, EQUATIONS OF MOTION, THEORY, EXPERIMENTAL DATA, SUBSONIC CHARACTERISTICS, WIND TUNNELS

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE