Preliminary Data on the Effects of Inlet Pressure Distortions on the J57-P-1 Turbojet Engine Page: 3 of 37
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NACA RM SE54K19 .....;. ...... ..
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
Bureau of Aeronautics, Department of the Navy
PRELIMINARY DATA ON THE EFFECTS OF INLET PRESSURE DISTORTIONS
ON THE J57-P-1 TURBOJET ENGINE
By Lewis E. Wallner, Robert J. Lubick, and Thomas H. Einstein
An investigation to determine the steady-state and surge character-
istics of the J57-P-1 two-spool turbojet engine with various inlet air-
flow distortions was conducted in the altitude wind tunnel at the NACA
Lewis laboratory. Along with a uniform inlet total-pressure distribu-
tion, one circumferential and three radial pressure distortions were
investigated. Data were obtained over a complete range of compressor
speeds both with and without intercompressor air bleed at a flight Mach
number of 0.8 and at altitudes of 35,000 and 50,000 feet.
Total-pressure distortions of the magnitudes investigated had very
little effect on the steady-state operating line for either the outer or
inner compressor. The small radial distortions investigated also had
little if any effect on narrowing the high speed operating range of the
engine over that obtained with the uniform inlet pressure distribution.
The circumferential distortion, however, raised the minimum speed at
which the engine could operate without encountering surge when the inter-
compressor bleeds were closed. This increase in minimum speed resulted
in a substantial reduction in the operable speed range accompanied by'a
reduction in the altitude operating limit.
At the request of the Navy Department, Bureau of Aeronautics, an
investigation was conducted to determine the steady-state and transient
performance of the J57-P-1 turbojet engine in the altitude wind tunnel
at the NACA Lewis laboratory. As part of this investigation, the steady-
state operating line and the operating condition of the two compressors
at the point where the engine surged were determined. These data are
reported herein for a uniform inlet total-pressure distribution, for one
circumferential inlet pressure distortion, and for three relatively small
radial pressure distortions.
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Wallner, Lewis E.; Lubick, Robert J. & Einstein, Thomas H. Preliminary Data on the Effects of Inlet Pressure Distortions on the J57-P-1 Turbojet Engine, report, December 3, 1954; (digital.library.unt.edu/ark:/67531/metadc65217/m1/3/: accessed April 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.