Noise reduction method

Details Noise reduction method Noise reduction method

1989-12-15

1991-12-24

Brown, Brian W.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181296, 416228, F01N 116

Patent

active

050743767

ABSTRACT:
When there is relative movement, at a speed above a critical value, between the trailing edge of a body, such as a hydrofoil or aerofoil section, and a fluid, the fluid flow tends to form a pattern of discrete swirling vortices. Vortex shedding at each side of the trailing edge alternately can cause resonance or "singing" of the section. The effect of this phenomenon is reduced by forming contiguous triangular flat-faced notches in the major surfaces of the section, adjacent the trailing edge, but leaving the profile of the leading edge substantially undistrubed. The notches in one major surface are preferably staggered relative to those in the other major surface.

REFERENCES:
patent: 3779338 (1973-12-01), Hayden et al.
patent: 4089618 (1978-05-01), Patel
patent: 4274806 (1981-06-01), Gallardo, Jr.
patent: 4370097 (1983-01-01), Hanson et al.

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