Low noise fan assembly

Details Low noise fan assembly Low noise fan assembly

1991-09-06

1992-12-08

Look, Edward K.

Rotary kinetic fluid motors or pumps

With sound or vibratory wave absorbing or preventing means...

F01D 2504

Patent

active

051692880

ABSTRACT:
A gas turbine engine rotor assembly such as a fan or compressor includes rotor blades spaced axially from stator vanes inside an annular duct. The number of vanes is selected for a predetermined number of blades for obtaining substantially equal values of a cut-off ratio for at least two blade passing frequency harmonics for reducing spinning mode noise from the duct.

REFERENCES:
patent: 3194487 (1965-07-01), Tyler et al.
patent: 3270953 (1966-09-01), Jerie et al.
patent: 3574477 (1971-04-01), McAlister et al.
patent: 3747343 (1973-07-01), Rosen
patent: 3883264 (1975-05-01), Rao
patent: 4131387 (1978-12-01), Kazin et al.
patent: 4883240 (1989-11-01), Adamson et al.
Tyler et al., "Axial Flow Compressor Noise Studies," SAE Transactions, 1961, pp. i-v, 1-41, FIGS. 1-22 and appendices I-III.
R. A. Kantola et al.,"Effects of Vane/Blade Ratio and Spacing on Fan Noise," paper AIAA-81-2033, Oct. 1981, pages:cover, and 1-15.

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