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Behavior of the Laminar Boundary Layer for Periodically Oscillating Pressure VariationThe calculation of the phenomena within the boundary layer of bodies immersed in a flow underwent a decisive development on the basis of L. Prandtl's trains of thought, stated more than forth years ago, and by numerous later treatises again and again touching upon them. The requirements of the steadily improving aerodynamics of airplanes have greatly increased with the passing of time and recently research became particularly interested in such phenomena in the boundary layer as are caused by small external disturbances. Experimental results suggest that, for instance, slight fluctuations in the free stream velocities as they occur in wind tunnels or slight wavelike deviations of outer wing contours from the prescribed smooth course as they originate due to construction inaccuracies may exert strong effects on the extent of the laminar boundary layer on the body and thus on the drag. The development of turbulence in the last part of the laminar portion of the boundary layer is, therefore, the main problem, the solution of which explains the behavior of the transition point of the boundary layer. A number of reports in literature deal with this problem,for instance, those of Tollmien, Schlichting, Dryden, and Pretsch. The following discussion of the behavior of the laminar boundary layer for periodically oscillating pressure variation also purports to make a contribution to that subject.
Document ID
20050028446
Acquisition Source
Langley Research Center
Document Type
Other - NACA Technical Memorandum
Authors
Quick, august Wilhelm
Schroeder, K.
Date Acquired
August 22, 2013
Publication Date
September 1, 1949
Publication Information
Publication: Ludwig Prandtl zum 70. Geburtstage, Schriften der Deutschen Akademie der Luftfahrtforschung, Publications of the Germany academy for Aviation Research
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
NACA-TM-1228
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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