Altitude performance characteristics of tail-pipe burner with variable-area exhaust nozzle Page: 4 of 59
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NACA RM E5E29 A *3
length; and (3) a variable-area exhaust nozzle approximately
10 inches long in the full-open position. The projected outlet
area of the nozzle was variable between 257 and 452 a quare inches.
R The combustion-chamber-inlet diameter of 32 inches, which was
required for low-velooity flqw at the flame holder, was not main-
tained over the entire length of the combustion chamber because
the variable-area exhaust nozzle and the 29-1inh-diameter rear
section of the combustion chamber were supplied as a single unit
by the engine manufacturer.
The diffuser and the combustion chamber were constructed of
0.063-inch Inconel. The downstream end of the diffuser inner body
terminated at the combustion-chamber inlet in a blunt end 8 inches
in diameter; a conical depression 4 inches deep at this point pro-
vided a sheltered region for seating a stabilizing flame in the
center of the canbustion chamber. A cooling liner constructed of
0.063-inch Inconel extended from the combustion-chamber inlet to
within 4 inches of the outlet of the fixed portion of the exhaust
nozzle. This cooling liner provided a 1/2-inch passage between
the liner and the burner shell through which flowed 0.06 to 0.08 of
the tail-pipe gas at approximately turbine-outlet temperature. The
liner was supported in the oylindrical sections of the combustion
chamber by methods that were designed to permit free longitudinal
expansion of the liner (fig. 2(b)). Interlocking channels were
used to support the cooling liner in the forward section of the
combustion chamber. In order to permit rapid disassembly of the
tail-pipe burner, the liner in the rear section was supported only
by hat-section stiffeners. These stiffeners were seam-welded to
the liner aid were held against the burner shell at the combustion-
chamber outlet by small clips extending It inches into each hat
section.
The variable-area exhaust nozzle was constructed to give a
single-plane circular outlet area when closed (fig. 3(a)) and also
when full open (fig. 3(b)), except that in the open position the
four corners of the movable lips protruded inches into the air-
cular area. At intermediate positions the outlet was irregular in
shape. Thin metal sealing strips were provided between the fixed
and movable portions of the nozzle to prevent leakage.
The fuel was injected normal to the direction of gas flow
from 12 radial, streamlined tubes (fig. 4) equally spaced circum-
ferentially around the diffuser section at a plane 2 inches
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Jansen, Emmert T. & Thorman, H. Carl. Altitude performance characteristics of tail-pipe burner with variable-area exhaust nozzle, report, August 11, 1950; (https://digital.library.unt.edu/ark:/67531/metadc58463/m1/4/: accessed April 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.