VORTEX GENERATOR MAKES ASYMMETRIC WAKE FOR REDUCING PROPELLER INDUCED NOISE AND VIBRATION

摘要

The present invention relates to a vertex generator for generating an asymmetric wake to reduce a propeller noise and vibration, capable of reducing noise and vibration of a propeller installed in a vessel by reducing cavitation generated on a wing surface of the propeller by controlling a flow introduced to the propeller. A related art wing-shaped annex or a flow control fin has the following problems. That is, since a wing-shaped structure attached to a surface of a hull in front of a propeller has an angle of attack with respect to an introduced flow to control a flow rate and a flow direction due to force of a fluid, the related art can obtain an effect only with a large structure. Also, although propeller efficiency based on a pre-swirl effect is enhanced by changing a speed of a tangential direction through the wing-shaped structure attached to the surface of the hull in front of the propeller, noise and vibration of the propeller are increased due to increased cavitation. In order to solve the problems of the related art, in the present invention, the angle of attack introduced to a wing surface is reduced by changing a speed in an axial direction based on generation of an asymmetric vortex, whereby an asymmetric wake distribution particularly making a flow on a first quadrant or a second quadrant where a largest amount of cavitation is produced fast is generated to minimize generation of cavitation noise.