Preliminary evaluation of pentaborane in a 1/4-sector of an experimental annular combustor Page: 4 of 20
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NACA RM E56B13
The combustor shown in figure 2 was-1/4-sector of an annular combus-
tor designed to fit the housing diameter and turbine nozzle annulus di-
mensions of a J47 turbojet engine. The dimensions are also similar to a
J65 turbojet engine. Figure 3 is a photograph of the combustor and dome.
The fuel nozzle assembly is shown in figure 4. It consisted of a
6-port air-atomizing nozzle with a cone angle of 700. Twelve of these
nozzles were used in the 1/4-sector and were directed normal to the air
The instrument stations are shown in figure 1. The arrangement of
thermocouples and total-pressure probes is shown in figure 5. Tempera-
tures were measured by bare-wire chromel-alumel thermocouples. Fuel flow
was measured by a rotating-vane flowmeter.
The fuel and atomizing-air systems are shown schematically in figure
6. The JP fuel was used to flush the fuel lines and nozzles immediately
before and after the pentaborane test.
The 1/4-sector tests were made at the following conditions:
Combustor-inlet temperature, OF ................... 372
Combustor-outlet temperature, OF ................. 1500
Combustor-inlet total pressure, in. Hg abs ............. 32
Air flow, lb/sec ...................... .... 4.53
These combustor conditions closely simulate the following flight
conditions of a J65 turbojet engine:
Altitude, ft . ... . . ......... . . - ....... 55,000
Mach number . .. ......................... 0.8
Engine speed, percent of rated .. .... ..... ....... 100
For the pentaborane test, the fuel nozzles were first flushed with JP
fuel, and the pentaborane turned on and ignited. Data were taken at 1-
minute intervals. JP-5 test data were taken at about 10-minute intervals.
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Kaufman, Warner B.; Lezberg, Erwin A. & Breitwieser, Roland. Preliminary evaluation of pentaborane in a 1/4-sector of an experimental annular combustor, report, May 22, 1957; (digital.library.unt.edu/ark:/67531/metadc62436/m1/4/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.