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