The External-Shock Drag of Supersonic Inlets Having Subsonic Entrance Flow Page: 4 of 29
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NACA RM LSOGlha
DM maximum diameter of inlet
DE entering-free-stream-tube diameter
DL entrance diameter of cowling
DB maximum diameter of central body
0c semicone angle of central body
81 cowling-position parameter, angle between axis of inlet
and straight line that connects vertex of cone with
lip of cowling
CD drag coefficient
o refers to stagnation free-stream conditions
1 free-stream conditions
L local-flow conditions
DESCRIPTION OF THE INLETS INVESTIGATED
AND THE TESTING PROCEDURE
The external-shock drag of two types of inlets having subsonic
entrance flow was determined in the investigation. The first type of
inlet tested had low external compression. The inlet (fig. 1) consisted
of a cowling and a central body having circular cross sections. The
cowling had an entrance diameter of 1.528 inches with internal-external
lip angles of 00, 2022'. The central body had a 200 semicone-angle tip
located at an angle of Oe 34047' with respect to the leading edge
of the cowling. The ratio of the maximum diameter of the inlet to the
entrance diameter was 1.1. The external-shock drag was determined for
the section up to the maximum diameter. In order to obtain different
stable mass flows into this inlet, four different maximum central-body
diameters were used. For purposes of identification the central bodies
are labeled from A to D and are used to identify the inlet-operating
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Nucci, Louis M. The External-Shock Drag of Supersonic Inlets Having Subsonic Entrance Flow, report, December 20, 1950; (digital.library.unt.edu/ark:/67531/metadc64669/m1/4/: accessed January 17, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.