Preliminary investigation of the delay of turbulent flow separation by means of wedge-shaped bodies Page: 4 of 31
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NACA RM A50L12
P pressure coefficient
(local static'pressure) - (free-stream static pressure)
q free-stream dynamic pressure, pounds per square foot
V free-stream velocity, feet per second
x distance from airfoil leading edge measured parallel to the chord
y distance measured normal to surface (both flat plate and airfoil),
z lateral distance measured parallel to leading edge of wedge, inches
ago section angle of attack, corrected for jet-boundary effect by the
method of reference 3, degrees
8f flap deflection, degrees
I circulation of the discharged vortex, feet squared per second
MODELS AND TESTS
Individual Wedges Mounted on a Flat Plate
The items investigated during the tests of individual wedges include
the minimum ramp angle and the maximum divergence angle which would per-
mit well-defined vortex flow, the circulation of the discharged vortex,
the effect on the boundary layer of the flat plate, the drag of the
wedges, and the effect of the ratio of wedge height to the initial thick-
ness of the oncoming boundary layer.
Three models, of different ramp and divergence angles, used in this
phase of the investigation were relatively large in order to facilitate
flow-direction measurements in the wake of the wedges. Other wedges of
about one-third the size of the large wedges were used in connection
with total-pressure measurements near the surface. The wedges were
mounted on a large flat plate which formed a dummy wall parallel with
the real wall of the wind tunnel so that the boundary layer of the
tunnel wall passed beneath the flat plate. The leading edges of the
wedges were normal to the stream direction and one face was parallel
with it as shown in figure i.
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McCullough, George B.; Nitzberg, Gerald E. & Kelly, John A. Preliminary investigation of the delay of turbulent flow separation by means of wedge-shaped bodies, report, March 1, 1951; (digital.library.unt.edu/ark:/67531/metadc58702/m1/4/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.