Aeronautics and astronautics – Aircraft power plants
Patent
1985-02-21
1987-04-07
Barefoot, Galen
Aeronautics and astronautics
Aircraft power plants
137 151, B64D 3302
Patent
active
046554130
ABSTRACT:
Aerodynamic flow conditions at the air intake of gas turbine engines, espally aircraft engines, comprising boundary layer deflectors are improved by movably arranging the boundary layer deflectors so that they may be retracted flush into the aircraft fuselage during take-off and low speed flight, and may be extended to an operating position during high speed flight. A similar retractable boundary layer deflector may be provided for an air intake for an auxiliary engine, which operates intermittently to drive auxiliary devices of an aircraft. When the auxiliary engine operates the air intake is open and the deflector is extended thereby improving the intake air flow conditions. When the auxiliary engine is shut down, the air intake is covered by a control flap and the deflector is retracted flush into the fuselage. These features provide optimal high- and low-speed flow conditions at the air intakes of the primary propulsion plant and of the auxiliary engine of an aircraft, and undesirable drag is eliminated or at least substantially reduced.
REFERENCES:
patent: 3489377 (1970-01-01), Pearson et al.
patent: 3659424 (1972-05-01), Polk
patent: 4121606 (1978-10-01), Holland et al.
patent: 4245803 (1981-01-01), DeBlois
patent: 4307743 (1981-12-01), Dunn
patent: 4418879 (1983-12-01), Vanderleest
patent: 4463772 (1984-08-01), Ball
Genssler Hans-Peter
Lotter Kurt
Barefoot Galen
Fasse W. G.
Fiorito Lynn M.
Kane, Jr. D. H.
Messerschmitt-Boelkow-Blohm Gesellschaft mit beschraenkter Haftu
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