Vibration and drag reduction system for fluid-submersed hulls

Details Vibration and drag reduction system for fluid-submersed hulls Vibration and drag reduction system for fluid-submersed hulls

1998-12-16

2000-11-21

Swinehart, Ed

Ships

Building

Antifriction surfaces

114264, 114265, B63B 134

Patent

active

061487511

ABSTRACT:
A system for reducing hydrodynamic drag and vortex-induced-vibration ("VIV") in a bluff hull. In a bluff hull that is designed to be at least partially submerged in a fluid, such as water, the hull has an internal area for holding or transferring fluid. When the hull is beset by a current present in the water, the surface of the bluff hull has an up-current side and a down-current side. The hull surface has at least one opening, preferably a slot-nozzle, for blowing the fluid from the internal fluid area of the bluff hull out of the hull surface and into the surrounding water at a velocity greater than the current velocity, so as to reduce flow separation of the current on the down-current side of the hull surface. Also, preferably, the fluid is blown out of the opening at an angle substantially tangential to the hull surface at the location of the opening and substantially in the direction of the current.

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