Method and apparatus for reducing drag and noise associated with

Details Method and apparatus for reducing drag and noise associated with Method and apparatus for reducing drag and noise associated with

1991-07-12

1991-12-24

Cohan, Alan

Fluid handling

Processes

Affecting flow by the addition of material or energy

138121, 137803, F17D 120

Patent

active

050743244

ABSTRACT:
A method and apparatus for reducing drag and noise associated with fluid w within a conduit is provided. The conduit has flexible walls that are shaped to form stationary waves having peaks and troughs and are repeated in the axial direction of the conduit. The stationary waves are moved along the axial direction of the conduit whereby a vortex is trapped in the fluid flow at each of the troughs. Each of the vortices forms part of an isolating layer between the conduit wall and the main stream of the fluid flow thereby reducing drag. Furthermore, the vortices push the dominant noise producing region toward the center of the fluid flow where sound coupling efficiency is lower.

REFERENCES:
patent: 3099993 (1963-08-01), Smith
patent: 3143124 (1984-08-01), Todd
patent: 4462429 (1984-07-01), Coursen
patent: 4852616 (1989-08-01), Holcomb

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