Analysis of Stage Matching and Off-Design Performance of Multistage Axial-Flow Compressors Page: 5 of 40
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NAGA RM E52D07
cp flow parameter
o compressor outlet
R stator inlet, rotor outlet
S rotor inlet, stator .outlet
1,2,3 . . . n inlet to first, second, third . . . any arbitrary stage
METHOD OF ANALYSIS
The determination of the over-all performance of a compressor
depends on the knowledge of the performance _of each stage of the ccon-
pressor. Because it has been found that two- and three-dimensional
treatments are generally difficult to handle, especially when sections
of a blade are stalled, an essentially one-dimensional solution of the
matching problem is used in this report.
The method of analysis is based upon the performance of a typical
single-stage compressor which is taken to be representative of the
stages throughout the multistage compressor being analyzed. The single-
stage-performance curves are "stacked" to form the multistage unit by
making the performance variables independent of compressor size and
assuming that the mean radius is constant. The performance of the multi-
stage compressor is then determined over a wide . range of speeds and
flows by stacking.
In applying the single-stage-performance curves to the design of
the multistage compressor, the following assumptions have been made:
(1) The single-stage-efficiency. curve used represents the efficiency
of each stage of the compressor regardless of rotor speed.
(2) Each stage in the compressor operates along the specified single-
stage-performance curves; thus any stage interaction effects are
(3) The effect of changes in the ratio of stagnation to static
density is neglected throughout the analysis.
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Finger, Harold B. & Dugan, James F., Jr. Analysis of Stage Matching and Off-Design Performance of Multistage Axial-Flow Compressors, report, June 27, 1952; (https://digital.library.unt.edu/ark:/67531/metadc59396/m1/5/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.