| 摘要 |
Vessels with improved performance capability and methods for improving such performance and foils which may be associated with a vessel for providing this improved performance capability. Additionally, a method and device for improving flow through a microporous barrier and a diffuser cell for generating gas bubbles, both of which may be associated with a vessel and/or a foil for a vessel for improving its performance. The foil is positioned forward of the vessel bowpeak with its trailing edge confronting same to impart momentum to water in the outboard direction to each side of the bowpeak while maintaining a streamline water flow, thereby reducing friction and turbulence on the wetted surface of the bow. The foil may have means of heating the surface of the leading section to reduce friction. The foil may have generators of and dispensers for friction reducing agents such as gas bubbles to distribute such agents into the path of the bow, advantageously from the trailing section of the foil. The foil may have means for drawing in water at the trailing edge to further streamline the passing flow. The foil may have a flow diverter therein to divert flow passing one side, through an opening in the foil, to the other side of the foil to create a force normal to the foil chord. This foil may be fixed at the bow or stern, with the span direction generally vertical, with the flow diverter acting as a rudder. Alternatively the foil may be pivotably mounted with a rudder stock on a vertical axis so that the entire foil pivots to act as a rudder and the flow diverter may be operated to make minor turning adjustments. The flow diverter may be used generally where "lifting" foils are employed, such as for hydrofoil vessel foils or for roll stabilizer fins mounted at the sides of the hull of a vessel. Flow through a microporous barrier is improved by impinging on the barrier ultrasonic wave energy as by positioning a piezoelectric transducer adjacent a barrier subjected to gas pressure on one side.
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