Aircraft turbofans: new economic and environmental benefits

Journal Article · Sun Sep 01 04:00:00 EDT 1985 · Mech. Eng.; (United States)

OSTI ID:6201669

Sampl, F R; Shank, M E

This article describes turbofan and turboprop engines. Advanced turbofans and turboprop engines, by continuing to reduce the velocities of the jet exhaust and fan tip speed, can provide significant noise reductions. New combustors incorporated into these engines have reduced smoke, hydrocarbons and carbon monoxide to levels below the current requirements. The third generation of turbofans will continue to increase fuel efficiency and reduce aircraft operating costs. They are more modular in design and consist of half as many parts as the earlier engines, reducing maintenance time by half. Some of the key features of the new turbofan concept include: a very high bypass ratio/compression ratio cycle; swept fan blades; a thin, low-loss nacelle; low-loss reduction gearing; new materials; advanced compressor/turbine airfoils; and high-speed rotors with improved clearance control.

• Research Organization: United Technologies Corporation, Pratt and Whitney, Engineering Division, East Hartford, CT
• OSTI ID: 6201669
• Journal Information: Mech. Eng.; (United States), Journal Name: Mech. Eng.; (United States) Vol. 107:9; ISSN MEENA
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320303* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION ABATEMENT
AIRCRAFT
BLOWERS
COST BENEFIT ANALYSIS
DESIGN
ENERGY CONSUMPTION
ENGINES
ENVIRONMENTAL IMPACTS
EXHAUST GASES
FLUIDS
FUEL CONSUMPTION
FUEL ECONOMY
GASEOUS WASTES
GASES
NOISE POLLUTION ABATEMENT
PISTONS
POLLUTION ABATEMENT
THERMODYNAMIC CYCLES
TURBOJET ENGINES
WASTES