Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils
Patent
1978-12-11
1982-01-19
Kashnikow, Andres
Aeronautics and astronautics
Aircraft sustentation
Sustaining airfoils
23926519, 239566, 239601, 239DIG7, 244216, B64C 2104
Patent
active
043112919
ABSTRACT:
A nozzle for a jet stream in which the rear edge of the nozzle has a number of notches spaced therealong to widen the jet stream while directing the jet stream rearwardly of the nozzle. Each notch has a narrow front apex and a rear opening substantially wider than the apex, and each notch widens substantially smoothly and progressively from its apex to its rear opening, each notch having sides which at least over a major portion of their length diverge from each other at an angle of at least 60 degrees, and preferably at least 90 degrees. The nozzle will commonly blow into a diffuser to provide thrust augmentation but may also be used simply to blow over a flap, or it may be used without any diffusers or flaps, simply to provide noise reduction. So long as the notch divergence angle is wide enough, loss of nozzle efficiency is minimized, and when a diffuser is used, thrust augmentation is increased. In another embodiment, fairings are placed between the notches to guide and confine the flow to the notches, permitting a large reduction in the notch angle.
REFERENCES:
patent: 63595 (1867-04-01), Wilmot
patent: 1015822 (1912-01-01), Mueller
patent: 1150473 (1915-08-01), Wiseley
patent: 1726152 (1929-08-01), Kiesel, Jr.
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patent: 2914916 (1959-12-01), Gelin et al.
patent: 3460763 (1969-08-01), Kopp
patent: 3584792 (1971-06-01), Johnson
patent: 3743185 (1973-07-01), FFowles-Williams et al.
patent: 3834834 (1974-09-01), Quinn
Garland Douglas B.
Gilbertson Frederick L.
Whittley Donald C.
Kashnikow Andres
The De Havilland Aircraft of Canada, Limited
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