Noise reduction means for prop-fan and the construction thereof

Details Noise reduction means for prop-fan and the construction thereof Noise reduction means for prop-fan and the construction thereof

1981-10-13

1982-11-09

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

416228, 416DIG2, 415119, 415181, B64C 1118

Patent

active

043582460

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: 1991095 (1935-02-01), Hochstetter
patent: 2269287 (1942-01-01), Roberts
patent: 3972646 (1976-08-01), Brown et al.
patent: 3989406 (1976-11-01), Bliss
patent: 3995970 (1976-12-01), Nobuyuki et al.
patent: 4012172 (1977-03-01), Schwaar et al.
patent: 4168939 (1979-09-01), Schmitz et al.
patent: 4171183 (1979-10-01), Cornell et al.
patent: 4248572 (1981-02-01), Fradenburgh
Mechanix Illustrated; Apr. 1978; vol. 74, No. 599, p. 38.
AIAA Paper No. 76-565, 3rd AIAA Aero-Acoustics Conference, Palo, Cal., Jul. 2-23, 1976.

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