A metnod is presented for estimating the equilibrium operating line for a compressor as a component part of a turbojet engine. The performance characteristics of the combustor, turbine, and Jet nozzle are treated in a simplified manner, so that the suitability of a given compressor for jet-engine application may be determined. The need for compressor-discharge bleed, a variable-area Jet nozzle, or both, to obtain satisfactory engine acceleration may be estimated from the position of the equilibrium operating line and the compressor surge line.
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