Turbofans turn to UHB propulsion

Journal Article · Sun Jul 01 00:00:00 EDT 1990 · Aerospace America; (USA)

OSTI ID:6890149

Gray, D E; Conliffe, C H ^[1]

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1. United Technologies Corp., Pratt and Whitney Group, East Hartford, CT (USA) General Electric Co., Fairfield, CT (USA)

While ducted fan engines typical of current transport aircraft practice are able to achieve bypass ratios of the order of between 10 and 20 at most, the full benefits of bypass ratio maximization are only achievable at ratios of the order of 30 to 50, which require open-fan configurations. An account is presently given of the development status of the two fundamentally different ultrahigh bypass (UHB) engine designs currently undergoing testing: one of which uses a gearbox, while the other relies on a contrarotating turbine configuration to achieve the requisite speed reduction. Both engines have undergone flight testing on an MD-80 airliner. Additional advanced UHB engine development programs undertaken by foreign manufacturers are noted.

• OSTI ID: 6890149
• Journal Information: Aerospace America; (USA), Vol. 28; ISSN 0740-722X
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
33 ADVANCED PROPULSION SYSTEMS
AIRCRAFT
TURBOFAN ENGINES
DESIGN
AIR TRANSPORT
FLIGHT TESTING
FUEL CONSUMPTION
PERFORMANCE
PERFORMANCE TESTING
PROPULSION SYSTEMS
ROCKET ENGINES
ENERGY CONSUMPTION
ENGINES
MACHINERY
TESTING
TRANSPORT
TURBOMACHINERY
320201* - Energy Conservation
Consumption
& Utilization- Transportation- Air & Aerospace
330000 - Advanced Propulsion Systems