Selecting
the frequency corresponding to the spectral peaks in Figure 1, the plot
of frequency versus velocity shown in Figure 2 is made. Shown are
data at angles of attack equal to 20° and 28°. A distinctly
linear relation is seen for all the angles of attack tested. This
type of linear relationship has been shown on very swept wing configuration
tested to date. Taking a linear curve fit of the data at a given
angle of attack, the relationship between peak frequency and velocity can
be expressed as the slope. The slope then varies also as a function
of angle of attack. To characterize the spectral peak frequencies,
the slopes are found for each angle of attack where spectral peaks are
present. At very high angles of attack, above 32°, the broad
band spectra of turbulence is seen. Reduced
Frequency