| 摘要 |
An apparatus to reduce skin friction drag on a marine hull by imparting ultrasonically-induced cavitation at a boundary layer of a hull-water interface. The apparatus comprises a sonification plate mounted or adapted to be mounted on at least a portion of a wettable area of the hull (interior or exterior) to define a boundary layer region with the water medium, a power source to energize the sonification plate, and a controller to regulate the frequency and/or intensity of microcavitation bubbles produced at the boundary layer whereby to alter the Reynolds number, kinematic viscosity, and coefficient of friction. The sonification plate is hermetically sealed and includes an array of ultrasonic transducers therein, which may be mounted on all or a portion of the hull. Energizing the transducers nucleates microcavitation bubbles upon entrained gases and/or particulate matter residing in the water medium.
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