Preliminary performance data for the J57-P-1 turbojet engine at altitudes up to 65,000 feet Page: 4 of 89
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NACA R SE54E26
compressor bleed ports. (See ref. 3 for details and performance of no-
flow ejectors.) The no-flow ejectors made possible high altitude opera-
otion over an, inboard rotor speed range of 7000 to .9500 rpm except where
limited by compressor surge, over-temperature operation of the turbine,
or minimum fuel flow (approximately 200 lb/hr, a minimum allowable set-
ting of test facility fuel control throttle).
Data were obtained defining four modes of engine operation. With
the automatic control in operation data were taken with engine throttle
settings of "idle" and 'maximum," and altitude was increased from 35,000
feet to the altitude at which compressor surge occurred, for each throt-
For further details regarding PROCEDURE, see reference 1.
PRESENTATION OF RESULTS
The figures are grouped according to the dependent variable and an
index to the figures is presented in table I. The figures are presented
in the same order as in reference 1. In each figure group for a given
dependent variable, four modes of engine operation are presented. The
modes and corresponding figure parts are as follows:
(a) Engine operation with both the compressor bleed ports closed.
(b) Engine operation with the large compressor bleed port open.
(c) Engine operation with both compressor bleed ports open.
(d) Normal engine operation with the automatic control.
Dashed curves denote 15,000 foot performance data taken from ref-
erence 1, and are shown for all conditions for which 15,000 foot data
were obtained. The break in the 15,000 foot line is the region of com-
pressor surge at that altitude. All solid symbols represent either the
upper or lower boundary of compressor surge as indicated in each par-
ticular figure key. Turbine outlet temperature limits, as indicated by
the four manufacturer's probes, is denoted with cross marks near the
high speed end of the figures.
Complete compressor surge and operational information for the four
modes of engine operation described in this report can be found in
A tabulation of the data is presented in table II.
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Miller, Robert R. & Bloomer, Harry E. Preliminary performance data for the J57-P-1 turbojet engine at altitudes up to 65,000 feet, report, June 15, 1954; (digital.library.unt.edu/ark:/67531/metadc60049/m1/4/: accessed July 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.