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Title: Aircraft turbofans: new economic and environmental benefits

Abstract

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.

Authors:
;
Publication Date:
Research Org.:
United Technologies Corporation, Pratt and Whitney, Engineering Division, East Hartford, CT
OSTI Identifier:
6201669
Resource Type:
Journal Article
Journal Name:
Mech. Eng.; (United States)
Additional Journal Information:
Journal Volume: 107:9
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 54 ENVIRONMENTAL SCIENCES; AIRCRAFT; TURBOJET ENGINES; AIR POLLUTION ABATEMENT; DESIGN; FUEL ECONOMY; BLOWERS; COST BENEFIT ANALYSIS; ENVIRONMENTAL IMPACTS; EXHAUST GASES; FUEL CONSUMPTION; NOISE POLLUTION ABATEMENT; PISTONS; THERMODYNAMIC CYCLES; ENERGY CONSUMPTION; ENGINES; FLUIDS; GASEOUS WASTES; GASES; POLLUTION ABATEMENT; WASTES; 320303* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Equipment & Processes; 500200 - Environment, Atmospheric- Chemicals Monitoring & Transport- (-1989)

Citation Formats

Sampl, F R, and Shank, M E. Aircraft turbofans: new economic and environmental benefits. United States: N. p., 1985. Web.
Sampl, F R, & Shank, M E. Aircraft turbofans: new economic and environmental benefits. United States.
Sampl, F R, and Shank, M E. 1985. "Aircraft turbofans: new economic and environmental benefits". United States.
@article{osti_6201669,
title = {Aircraft turbofans: new economic and environmental benefits},
author = {Sampl, F R and Shank, M E},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/6201669}, journal = {Mech. Eng.; (United States)},
number = ,
volume = 107:9,
place = {United States},
year = {Sun Sep 01 00:00:00 EDT 1985},
month = {Sun Sep 01 00:00:00 EDT 1985}
}