Total-Pressure Distortion and Recovery of Supersonic Nose Inlet With Conical Centerbody in Subsonic Icing Conditions Page: 4 of 42
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NACA RM E57GO9 CONFIDENTIAL 3
Various distortion patterns were simulated (by use of screens) in
the jet-engine studies of references 2 to 4. Although generalizing the
level or pattern of total-pressure distribution to be expected in flight
was difficult, the patterns were selected to cover a range that might be
encountered. The total-pressure-distortion levels obtained were of the
order of 15 to 30 percent.
In order to determine the effect that ice formations on a typical
supersonic nose inlet might have on the type and magnitude of airflow
distortion and the value of pressure recovery at the compressor face of
a turbojet engine, the present investigation was conducted in the NACA
Lewis icing tunnel. This study provides values of total-pressure distor-
tion and recovery as a function of corrected weight flow resulting from
ice formations on a full-scale supersonic nose inlet. Clear-air data
were also taken for comparison. Free-stream and compressor-face Mach
numbers were varied over a range from 0.17 to 0.28 and 0.10 to 0.47,
respectively; inlet angle of attack from 00 to 12; and icing-cloud
liquid-water content from 0.65 to 1.8 grams per cubic meter. In general,
the data herein represent the low-flight-speed, low-altitude operation
of a supersonic airplane (takeoff, landing, loitering), the type most
likely to present an icing problem for such an airplane.
SYMBOLS
A flow area (see fig. 2(c)), sq ft
dmed volume-median droplet diameter, microns
g acceleration due to gravity, 32.2 ft/sec2
M Mach number
P total pressure
AP local maximum minus local minimum total pressure
R gas constant, 53.3 ft/R
rl radius of inner cowl (see fig. 2(c))
r2 radius of centerbody (see fig. 2(c))
t static air temperature, OF
V velocityCONFIDENTIAL
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Gelder, Thomas F. Total-Pressure Distortion and Recovery of Supersonic Nose Inlet With Conical Centerbody in Subsonic Icing Conditions, report, September 17, 1957; (https://digital.library.unt.edu/ark:/67531/metadc52938/m1/4/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.