Noise reduction means for prop-fan

Details Noise reduction means for prop-fan Noise reduction means for prop-fan

1979-07-16

1983-01-25

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Tined or irregular periphery

416223R, 415119, B64C 1118

Patent

active

043700977

ABSTRACT:
A prop-fan of the type having a high solidity factor (1 or greater) near the root fairing to a lower solidity factor (less than 1) near the tip and operable over a critical Mach No. range is designed for sound suppression by contouring the tip so that its sweep and sweep distribution of the leading and trailing edge bears a judicious relationship with the Mach surface. This feature is obtainable by designing the planform from a prescribed linearized or non-linearized acoustic theory and tailoring in the sweep so that the leading and trailing edges fall behind the Mach surface.

REFERENCES:
patent: 2663493 (1953-12-01), Keast
patent: 3199603 (1965-08-01), Margolis
patent: 3972646 (1976-08-01), Brown et al.
patent: 3989406 (1976-11-01), Bliss
patent: 4131387 (1978-12-01), Kazin
patent: 4168939 (1979-09-01), Schmitz et al.
patent: 4171183 (1979-10-01), Cornell et al.
Aviation Week & Space Technology, Jan. 3, 1977, vol. 106, No. 1, pp. 46-50.
Aero Digest, Jul. 1951, vol. 63, No. 1, pp. 99-107.
American Institute of Aeronautics and Astronautics Paper No. 75-1208, Oct. 1, 1975.
AIAA Paper No. 76-565, Aero-Acoustics Conference, Jul. 20-23, 1976, Palo Alto, Calif.

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