Effects of internal corner fillets on pressure recovery: Mass flow characteristics of scoop-type conical supersonic inlets Page: 2 of 15
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
EFFECTS OF INTERNAL CORNER FILLETS ON PRESSURE RECOVERY -
MASS FLOW CHARACTERISTICS OF SCOOP-TYPE CONICAL
By Alfred S. Valerino
An investigation was conducted in the NACA Lewis 8- by 6-foot
supersonic tunnel at free-stream Mach numbers of 1.49 to 1.97 at zero
angle of attack to determine the effects of internal corner fillets on
the pressure recovery characteristics of twin-scoop conical-type inlets
utilizing boundary-layer removal and mounted on the RM-1O body. The
inlet size was relatively small, with a cowl lip radius of 1.33 inches.
The Reynolds number based on inlet diameter was approximately 10xl05.
Results obtained from the investigation of these inlets indicated
that without boundary-layer removal, the use of fillets resulted in
substantial improvements in the pressure recoveries at and near critical
mass flows at free-stream Mach numbers of 1.49 and 1.78. No significant
improvement resulted, however, at a free-stream Mach number of 1.97.
With complete boundary-layer removal, the fillets increased the critical
pressure recovery approximately 5 percent at a free-stream Mach number
of 1.97. Employing internal corner fillets also slightly increased the
range of stable operation of the inlets.
Many of the half-conical and normal wedge-type scoop inlets pre-
viously reported had sharp corners at the cowl-splitter plate or com-
pression surface-splitter plate junctions. Apparently no literature
evaluating the effects of these corners on supersonic inlet performance
is available. However, during a visit to the Lewis laboratory, Dr. Fritz
Feldman mentioned that the use of small fillets between the normal wedge
compression surface and the cowling of a scoop-type inlet operating at a
a free-stream Mach number of approximately 3.0 resulted in increases in
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Valerino, Alfred S. Effects of internal corner fillets on pressure recovery: Mass flow characteristics of scoop-type conical supersonic inlets, report, December 8, 1952; (digital.library.unt.edu/ark:/67531/metadc64540/m1/2/: accessed February 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.