| 摘要 |
A method of enhancing the output efficiency of a propeller and reducing the noise thereof wherein a plurality of small cavities are formed on the whole or at least a portion of a blade skin of the propeller. When the propeller is rotated and a fluid passes through the small cavities, a plurality of small vortexes are created at the blade skin to form a thin turbulent boundary layer that allows an advantageous interference acting on a turbulence of the fluid at the blade skin. In this way, a portion of fluid is not in contact with the blade skin, and a viscous drag acting on the blade skin is reduced to extend a wake and reduce a drag force of the wake. The aforementioned mechanism can enhance the output efficiency of a propeller and reduce the noise thereof.
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