Investigation at supersonic speeds of an inlet employing conical flow separation from a probe ahead of a blunt body Page: 3 of 34
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
INVESTIGATION AT SUPERSONIC SPEEDS OF AN INLET EMPLOYING CONICAL
FLOW SEPARATION FROM A PROBE AH~AD OF A BLUNT BODY
By Donald P. Hearth and Gerald C. Gorton
An investigation was made in the Lewis 8- by 6-foot supersonic
wind tunnel on an inlet employing conical flow separation from a probe
extending upstream from a hemispherical-nosed centerbody. Data were
obtained at free-stream Mach numbers from 1.6 to 2.0 and angles of
attack from 00 to 90.
Pressure-recovery and drag characteristics for the inlet were very
nearly comparable with those for a conical-spike inlet at zero angle of
attack and design Mach number of 2.0, but compared less favorably at
Mach numbers below 2.0.
A large reduction in pressure recovery and mass flow was obtained
at angle of attack. However, an investigation on the use of probes
offset from the inlet center line indicated that the angle-of-attack
performance could be appreciably improved if the probe were alined with
the stream direction.
When a probe or rod is extended sufficiently forward of a blunt-
nosed body in a supersonic stream, flow separation occurs from the
probe (references 1 to 8). This phenomenon occurs because of the
inability of the boundary layer on the probe to withstand the large
static-pressure rise associated with the detached shook caused by the
blunt body. Various investigations (references 1 to 5) have been
conducted applying this form of flow separation as a means of reducing
the drag of blunt-nosed bodies at supersonic speeds. Application of
this separation phenomenon to supersonic inlets has been initiated
(reference 6) by utilizing the separated-flow-region boundary as the
compression surface in place of the usual solid cone. Because of the
spherical shape of the blunt body, such an inlet would be more
desirable as a housing for a radar homing system than a conical-
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Hearth, Donald P. & Gorton, Gerald C. Investigation at supersonic speeds of an inlet employing conical flow separation from a probe ahead of a blunt body, report, January 19, 1953; (https://digital.library.unt.edu/ark:/67531/metadc59520/m1/3/: accessed April 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.