Noise reduction method
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United States of America Patent
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-
Dec 24, 1991
Grant Date -
N/A
app pub date -
Dec 15, 1989
filing date -
Dec 21, 1988
priority date (Note) -
Expired
status (Latency Note)
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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.
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