Unsteady Turbulent Boundary Layers in Adverse Pressure Gradients

A number of characteristics of an unsteady turbulent boundary layer have been measured on the after part of the upper surface of an 0012 airfoil (X/ c = 0.69 and 0.94). The data is taken at chord Reynolds number of 700,000 and over a range of reduced frequencies (based upon the semichord) of 0.5 to...

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Bibliographic Details
Main Authors: Covert, Eugene E, Lorber, Peter F
Format: Report
Language:English
Subjects:
ADVERSE CONDITIONS
Aircraft
AIRFOILS
Fluid Mechanics
PE61102F
PRESSURE GRADIENTS
STEADY STATE
TURBULENT BOUNDARY LAYER
UNSTEADY FLOW
WIND TUNNEL TESTS
WUAFOSR2307A2
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Summary:A number of characteristics of an unsteady turbulent boundary layer have been measured on the after part of the upper surface of an 0012 airfoil (X/ c = 0.69 and 0.94). The data is taken at chord Reynolds number of 700,000 and over a range of reduced frequencies (based upon the semichord) of 0.5 to 6.4. Mean and unsteady velocity profiles, as well as Reynolds stress profiles, are presented, as is the nonlinear coupling from the unsteady motion into the steady motion. Data is presented and discussed which shows that for this experiment the periodic unsteady turbulent velocity profile tends toward a universal shape. Proceedings of the AIAA/ASME Joint Thermophysics, Fluids, Plasma and Heat Transfer Conference (3rd), 7-11 Jun 1982, St. Louis, MO.