SLAT TRANSITION AT 16 DEG (UNCORRECTED)
1st
AIAA CFD High Lift Prediction Workshop
At 16 degrees (uncorrected) = 17.10 degrees (corrected), the
estimated location of the attachment line passes over the lower surface
films 38 and 39,
as seen here. The section pressure profiles are
benign in the sense that no strong suction peak has yet appeared. The
only remarkable feature of the pressures at 16 degrees is at
eta = 0.65, port 1.
At this location there is a change in behavior of the slope of the Cp versus
Alpha plot at this angle of attack. The analysis of the pressures
over the wing suggest that the
attachment line is laminar, as all values of Rbar fall below the value where any
disturbance would die out rather than be amplified.
Upper Surface
For Object 37 (click to see schematic), on the upper surface of
the model, most of the films are aligned more with the leading edge
than with the free stream
(click here to see a drawing of how the films were aligned on the slat).
Note that the way these films were hooked up, film 7 (6 if counting from
zero) its the highest film and is the one aligned most with
the free stream.
The statistics from the film normal to the l.e. plotted versus
angle of attack indicte that at 16 degrees the flow is turbulent. The
statistics all of Object 37's films for alpha = 16 degrees can be
viewed here.
It is important to remember that these films are at different angles
to the flow direction. You must be careful, therefore, when comparing
absolute value of the rms or the DC levels between films. The important
part to see here is that the skewness is approaching zero, and flatness
is approaching a value of 3. This means that the flow is approaching
fully turbulent flow at this point on the slat.
A composite plot of the rms for each film of 37 is shown here for various alphas.
Lower Surface
There are 3 arrays on the
lower surface of the slat, but before the cusp of the cove. These
are arrays 34, 38, and 39.
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Page Curator and NASA Official Responsible for Content
Li Wang
Last Updated
August 15, 2011
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