ASYMMETRIC WAKE GENERATING VORTEX GENERATOR FOR REDUCING PROPELLER NOISE AND VIBRATION

摘要

The present invention relates to an asymmetric wake generating vortex generator for reducing propeller noise and vibration, configured such that, by controlling a flow that is introduced into a propeller installed on a ship so as to reduce cavitation that occurs on a wing surface of the propeller of the ship, the noise and vibration of the propeller can be reduced. Conventional wing-shaped added materials or flow control fins have the following problems: a wing-shaped structure is attached to the surface of a hull in front of a propeller and, in order to control a flow introduced into the propeller, is made to have an angle of attack with regard to the introduced flow; therefore, the same is configured to control the velocity of flow and the direction of flow, resulting from a fluid force, and thus can exhibit an effect only when the same is a large structure; furthermore, when the same is attached to the surface of the hull in front of the propeller so as to change the velocity in the tangential direction, the resulting pre-swirl effect improves the efficiency of the propeller, while the increased cavitation increases noise and vibration of the propeller. In order to resolve the above problems, the present invention provides an asymmetric wake generating vortex generator for reducing propeller noise and vibration, configured such that the angle of attack, which is introduced to a wing surface, is reduced through a change in velocity in the axial direction resulting from generation of an asymmetric vortex, thereby generating an asymmetric wake distribution that makes the flow on a first or second quadrant of a propeller surface, on which the largest degree of cavitation occurs, particularly fast, and thereby minimizing generation of cavitation noise.