Investigation at supersonic speed (M = 1.53) of the pressure distribution over a 63 degrees swept airfoil of biconvex section at zero lift Page: 2 of 35
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NACA RM No. A8022 ~
NATIONAL ADVISORY COMMIT~ FOR AERONAUTICS
INVESTIGATION AT SUPRESONTIC SPEED (M = 1.53) OF THE PRESSURE
DISTRIBUTION OVER A 63o SWEPT AIRFOIL OF
BICONVEX SECTION AT ZERO LIFT
By Charles W. Frick and John W. Boyd
The results of an investigation at supersonic speed of the distri-
bution of pressure at zero lift over the surface of a swept airfoil of
biconvex section are presented. The airfoil used for the experiment 1ats
composed of sections 7 percent thick in streamwise planes and was swept
back 630. The aspect ratio was 1.66 and the taper ratio 1. The tests
were made at a Mach number of 1.53 over a Reynolds number range of
0.481 x 10A to 3.25 x 10e.
The measured pressures have been compared with theoretical values
calculated from thin-airfoil theory. In general, good agreement is
found except where the limitations of the linear theory may be expected
to manifest themselves: namely,
1. The region of influence of the subsonic trailing
edge on the pressure distribution, which determines the
location of the pressure minimum, does not extend up to the
Mach line from the root trailing edge as theory predicts,
since the local Mach numbers on the airfoil are appreciably
greater than that of the stream. The position of the
pressure minimum is therefore moved rearward.
2. The pressure recovery behind the pressure minimum
is greater than predicted by theory and, although the data
are not conclusive, appears to take place, in part, through
a shock wave.
These deviations from the linear theory result in an appreciable
increase in the pressure drag over that calculated by theory.
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Frick, Charles W. & Boyd, John W. Investigation at supersonic speed (M = 1.53) of the pressure distribution over a 63 degrees swept airfoil of biconvex section at zero lift, report, June 10, 1948; (digital.library.unt.edu/ark:/67531/metadc57586/m1/2/: accessed February 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.