quarta-feira, 17 de novembro de 2010

Fugindo da cavitação




Extraído do excelente livro de Faltinsen, Hydrodynamics of high speed marine vehicles:

"Foil cavitation limits the vessel’s speed to about 50 knots. Proper design to delay cavitation on the aft foil system requires evaluation of the wake from the forward foil system. An important effect is caused by roll-up of tip vortices originating from the forward foil system. The wake from the forward foil causes an angle of attack that varies along the span of the aft foil, which can be counteracted by using a twisted aft foil that is adapted to the inflow. One foil catamaran experienced problems with foil cavitation during operation, which were resolved by drilling holes in the aft part of the foils to provide communication between theflowon the pressure and suction sides of the foils."

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