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Variable Cycle Engines for Advanced Supersonic Transports
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English
Abstract
Variable Cycle Engines being studied for advanced commercial supersonic transports show potential for significant environmental and economic improvements relative to 1st generation SST engines. The two most promising concepts are: a Variable Stream Control Engine and a Variable Cycle Engine with a rear flow-control valve. Each concept utilizes variable components and separate burners to provide independent temperature and velocity control for two coannular flow streams. Unique fuel control techniques are combined with cycle characteristics that provide low fuel consumption, similar to a turbojet engine, for supersonic operation. This is accomplished while retaining the good subsonic performance features of a turbofan engine. A two-stream coannular nozzle shows potential to reduce jet noise to below FAR Part 36 without suppressors. Advanced burner concepts have the potential for significant reductions in exhaust emissions. In total, these unique engine concepts have the potential for significant overall improvements to the environmental and economic characteristics of advanced supersonic transports.
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Citation
Howlett, R. and Kozlowski, H., "Variable Cycle Engines for Advanced Supersonic Transports," SAE Technical Paper 751086, 1975, https://doi.org/10.4271/751086.Also In
References
- Howlett Robert A. “Engine Design Considerations for 2nd Generation Supersonic Transports,” SAE Paper No. 750628 May 1975
- SAE Aerospace Information Report (AIR) 876 - Jet Noise Prediction Procedures
- Grobman J. Ingebo R. D. “Forecast of Jet Engine Exhaust Emissions for High Altitude Commercial Aircraft,” NASA TMX-71509