Preliminary Tests of a Burner for Ram-Jet Applications Page: 2 of 15
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TECH LIBRARY KAFB, NM
NAA RM No. L6KD9o 4L
NATIONAL ADTSORY COITEE FOR AIRONATTIC.
PELIMITARY TETS OF A BURflER FO
RAPM- JET APPLICATIONS
By Paul W. Huber
Preliminary tests have been made of a smail burner to meet
the requirements for application to supersonic ram Jets. The
principal requirements were taken as: (1) efficient combustion
in a high-velocity air stream, (2) utilization for combustion
of only a small fraction of the air passing through the unit,
(3) low resistance to air flow, (-) simple construction, and
(5) light weight.
Tests of a small burner were carried to stream velocities
of nearly 150 feet per second and fuel rates such that one-
eighth to one-fourth of the total air was involved in combustion.
Commercial propane was selected as the fuel since its low boiling
point facilitated vaporization.
Combustion which was 80 percent complete along with low.
aero&vnamic losses was obtained by injecting the fuel evenly,
prior to ignition, and allowing it to mix with the air without
appreciably disturbing the stream. The pressure drop due to
frictional losses around the burner and to the adjacent inside
walls of the ran jet is small compared with the pressure drop
due to combustion.
There is a need for burners to meet the requirements for
application to high-speed ram jets, such as the supersonic
ran jet described in reference-1. Reference 1 shows that high
velocities in the burning section are desirable in order to keep
the fuselage slender and so give lower fuselage pressure drag.
It follows that frictional losses through the burner will also
became important at the high internal velocities. A system for
obtaining efficient combustion when utilizing only a small
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Huber, Paul W. Preliminary Tests of a Burner for Ram-Jet Applications, report, January 15, 1947; (https://digital.library.unt.edu/ark:/67531/metadc63915/m1/2/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.