Variable cycle engines for advanced supersonic transportsVariable 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.
Document ID
19760039339
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Howlett, R. A. (United Technologies Corp. East Hartford, CT, United States)
Kozlowski, H. (United Technologies Corp. Pratt and Whitney Aircraft Div., East Hartford, Conn., United States)
Date Acquired
August 8, 2013
Publication Date
November 1, 1975
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
SAE PAPER 751086
Meeting Information
Meeting: National Aerospace Engineering and Manufacturing Meeting