Internal and external aerodynamics of ducted bodies at supersonic speeds Page: 2 of 28
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NACA CB To. L6B26
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
COIFPIDENTI AL BULLETIN
INTERNAL AND EXTERNAL AERODYNAMICS OF DUCTED
BODIES AT SUPERSONIC SPEEDS
By Clinton E. Brown
A method for calculating the lift, moment, and
pressure drag of slender open-nose bodies of revolution
at supersonio speeds is described. An application of the
method to a typical ram-jet fuselage is shown to give
excellent agreement with available experimental data.
A drag comparison was omitted because of the presence
of skin-friction drag in the experimental drag data.
The problem of obtaining high total-pressure recovery at
supersonic speeds is discussed and some experimental
data obtained at the Langley Memorial Aeronautical
Laboratory of the NACA on circular diffusers is pre-
sented. It is pointed out that variable-geometry dif-
fusers might be designed to give high diffuser efficien-
cies over a wide range of Mach number.
Work on ram-Jet housing bodies was started at the
NACA in the summer of 1943. At that time, no experi-
mental data of any kind were available in this country
on ducted bodies at supersonic speeds. As work pro-
gressed, an open-nose body of revolution was selected
as a fuselage for a possible supersonic airplane. A
test programm was started in the Langley model super-
sonic tunnel and a 5-inch model of the fuselage selected
was tested at several Mach numbers. Curves from these
data were obtained of lift, moment, and drag coefficients.
In cnnjunctior with the test progra., an investigation
was begun to find means for oaloulating the aerodynamic
characteristics of these bodies. As a result, a method
was found (reference 1) which, for the body tested,
gave excellent agreement with the experimental results.
Previous to this work, a series of tests were conducted
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Brown, Clinton E. Internal and external aerodynamics of ducted bodies at supersonic speeds, report, April 1946; (digital.library.unt.edu/ark:/67531/metadc62446/m1/2/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.