Apparatus and method for reducing fluid drag on a submerged...

Details Apparatus and method for reducing fluid drag on a submerged... Apparatus and method for reducing fluid drag on a submerged...

2007-05-22

2007-05-22

Avila, Stephen (Department: 3617)

Ships

Building

Antifriction surfaces

Reexamination Certificate

active

10907795

ABSTRACT:
An apparatus and method for reducing surface friction drag on the hull of a surface vessel by entraining air into water flowing in the boundary layer flow along the hull. A hemispherical protrusion creates flow separation by diverting a portion of the water flow away from the surface of the hull, which results in a reduced pressure region downstream from the protrusion. A vent located on the protrusion allow air to flow into the reduced pressure region. The air in the reduced pressure region is entrained into the water due to turbulent mixing from vortices shed on to the rear of the protrusion.

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patent: 6789491 (2004-09-01), Takahashi et al.
patent: 2002/0029731 (2002-03-01), Takahashi et al.
patent: 2002/0166491 (2002-11-01), Ha et al.
patent: 2004/0000265 (2004-01-01), Carson

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