Preliminary investigation of the delay of turbulent flow separation by means of wedge-shaped bodies Page: 3 of 31
This report is part of the collection entitled: National Advisory Committee for Aeronautics Collection and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
NACA RM A50L12
small low-aspect-ratio wings to mix high-energy air from the outer flow
with the low-energy air near the surface on which boundary-layer control
is desired. It was reasoned that a wedge-shaped body would combine both
flow mechanisms and have the additional advantage of discharging the
oncoming boundary layer flowing up the ramp as a sheet of vorticity over
the oblique edge of the wedge. The discharged sheet of vorticity would,
in turn, roll up into a trailing vortex. Thus, the action of the wedge
would be threefold, and was expected to exert a powerful control on
The investigation, conducted in the Ames 7- by 10-foot wind tunnels,
consisted of, first, an exploration of the flow associated with indi-
vidual wedges when mounted on a flat plate, and, second, a determination
of the effectiveness of multiple wedges for delaying separation of the
turbulent boundary layer from the upper surface of a two-dimensional
The coefficients and symbols contained in this report are defined
b wing span, feet
c wing chord, feet
cd average section drag coefficient, corrected for jet-boundary effect
by the method of reference 3 drg)
6cd incremental section drag coefficient [(cd for airfoil with
wedges) - (cd for airfoil without wedges)]
c1 average section lift coefficient, corrected for jet-boundary effect
by the method of reference 3 ( ft)cb
cm average section pitching-moment coefficient referred to the quarter
chord, corrected for jet-boundary effect by the method of refer-
ence 3 pitching moment
LH local total-pressure decrement [ (free-stream total pressure) -
(local total pressure in boundary layer or trailing vortex)],
pounds per square foot
Here’s what’s next.
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
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/m1/3/: accessed May 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.