Quiet shrouded circulation control propeller

Details Quiet shrouded circulation control propeller Quiet shrouded circulation control propeller

1972-09-15

1976-01-27

Raduazo, Henry F.

Power plants

Reaction motor

Including mechanical air compressor or air flow inducing means

415DIG1, F02k 300

Patent

active

039344100

ABSTRACT:
The purpose of this invention is a propeller capable of generating high tst at reduced noise levels, weight and drag. The propeller blades employ a tangential slot along the trailing edge of each propeller blade and circulation control blowing from the tangential slot over the trailing edge. Lift is generated by the coanda blowing. The lift is proportional to the momentum flow of the air out of the slot and is substantially independent of the rotational velocity. Additionally a circulation control shroud expands the thrusting slipstream of the propeller so that the shroud diffusion angle is increased and the average exit velocity is reduced, thereby increasing efficiency and reducing noise.

REFERENCES:
patent: 2084462 (1937-06-01), Stalker
patent: 2393933 (1946-01-01), Poole
patent: 2998700 (1961-09-01), Chaplin, Jr.
patent: 3000401 (1961-09-01), Ringleb
patent: 3032313 (1962-05-01), Szydlowski
patent: 3230702 (1966-01-01), Soulez et al.
patent: 3620640 (1971-11-01), Lariviere
patent: 3643617 (1972-02-01), Holden

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