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Altitude Evaluation of a Variable Cycle Turbofan Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1974 by SAE International in United States
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This paper presents the results of an altitude test evaluation of a variable-cycle turbofan engine. The test engine was a medium-bypass, two-spool turbofan engine modified to incorporate variable inlet guide vanes and first-stage stators in the low-pressure compressor, variable first-stage stator vanes in the low-pressure turbine, and variable area fan and primary exhaust nozzles. The results of the testing indicated that these variable-geometry components offer potential improvements to the following problem areas in multimission aircraft at off-design conditions: inlet spillage drag and exhaust-system boattail drag, compressor surge-margin control, airframe bleed-air extraction effects on engine performance, and performance limited by engine operating limits.
CitationStephenson, D., Davenport, W., and Topping, R., "Altitude Evaluation of a Variable Cycle Turbofan Engine," SAE Technical Paper 740806, 1974, https://doi.org/10.4271/740806.
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