Noise reduction of aircraft flap

Details Noise reduction of aircraft flap Noise reduction of aircraft flap

2005-06-22

2009-02-03

Nguyen, Ninh H (Department: 3745)

Rotary kinetic fluid motors or pumps

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

C416S23100A

Reexamination Certificate

active

07484930

ABSTRACT:
A reduction in noise radiating from a side of a deployed aircraft flap is achieved by locating a slot adjacent the side of the flap, and then forcing air out through the slot with a suitable mechanism. One, two or even three or more slots are possible, where the slot is located at one or more locations selected from a group of locations comprising a top surface of the flap, a bottom surface of the flap, an intersection of the top and side surface of the flap, an intersection of the bottom and side surfaces of the flap, and a side surface of the flap. In at least one embodiment the slot is substantially rectangular. A device for adjusting a rate of the air forced out through the slot can also be provided.

REFERENCES:
patent: 3012740 (1961-12-01), Wagner
patent: 3596854 (1971-08-01), Haney, Jr.
patent: 3669386 (1972-06-01), Jacobs et al.
patent: 3881669 (1975-05-01), Lessen
patent: 5158251 (1992-10-01), Taylor
patent: 7100875 (2006-09-01), Shmilovich et al.
Brooks, T.F. & Humphreys, W.M.Jr., “Flap Edge Aeroacoustic Measurements and Predictions,” AIAA 2000-1975.
Koop, et al, “Reduction of Flap Side Edge Noise by Active Flow Control,” AIAA 2002-2469.
Hutcheson, Florence V. & Stead, Daniel J., “PIV Measurements on a Blowing Flap,” AIAA 2005-0212.

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