Effect of Nozzle Contour on Drag of Parabolic Afterbodies Page: 3 of 26
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NACA RM E54D)2
contours on the drag of surrounding parabolic afterbodies. These five
nozzles were operated over a range of pressure ratios from jet-off to
greater than 12 at free-stream Mach numbers of 1.6 and 2.0. The Reyn-
olds number based on model length and free-stream flow conditions
varied from 2.14x107 to 3.24x107.
The following symbols are used in this report:
CD drag coefficient based on maximum body area
Cp pressure coefficient, (p-po)/0
k constant in nozzle contour equation - V2 - V2
L length of convergent portion of nozzle
M Mach number
P total pressure, lb/sq ft
P1/0 nozzle pressure ratio
p static pressure, lb/sq ft
q dynamic pressure, pM2/2, lb/sq ft
R radius, in.
V velocity, ft/sec
x axial distance, in.
y ratio of specific heats
p pressure A
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Vargo, Donald J. & Englert, Gerald W. Effect of Nozzle Contour on Drag of Parabolic Afterbodies, report, June 21, 1954; (digital.library.unt.edu/ark:/67531/metadc60766/m1/3/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.