Method for reducing rudder resistance of ships

Abstract

The invention relates to a method for reducing rudder resistance of ships, in particular to a method for reducing underwater resistance of a rudder by means of leading in air bubbles in negative pressure. The method includes providing a ship with a screw propeller required for advancing of a hull and a rudder at the back of the screw propeller at preset positions; arranging an air bubble releaser at the front edge of the rudder; providing an air leading-in device which comprises at least one air guide pipe; utilizing high-speed water flow generated from the screw propeller during advancing of the hull to impact an upstream face of the rudder, and forming negative pressure at an air bubble releasing outlet according to the Bernoulli's principle to suck air; leading air into the air inlet through the air guide pipes, and releasing the air from the air bubble releasing outlet to mix with the water flow so as to form a great quantity of air bubbles. An air inlet is arranged at the upper end of each air guide pipe, and a lower section is connected to the air inlet of the air bubble releaser. By the method, high-speed water flow resistance generated from the rudder to the screw impeller can be reduced, and accordingly energy is saved.

Description

technical field [0001] The invention relates to a method for reducing the resistance of a ship's rudder, in particular to a method for reducing the resistance of a ship's rudder by utilizing negative pressure to introduce gas bubbles. Background technique [0002] In addition to the hull, there are pendants or hangers attached to the outside of the hull, such as: figure 1 The shown ship 10 includes a hull 11, and a propeller 13 pivotally arranged on the hull 11 and below the waterline 12, and the pendant behind the propeller 13 of the ship 10 shown in this figure is a ship rudder 14. to control the direction. [0003] figure 2 As shown, the water flow produced by the propeller 13 of the above-mentioned ship 10 flows through the schematic diagram of the rudder 14 of the ship. Since the rudder 14 of the ship is just at the downstream of the high-speed water flow of the propeller 13, the resistance of sailing will be increased, but the rudder 14 of the ship is this type. 10...

AI Technical Summary

Problems solved by technology

Therefore, the resistance produced by the ship's rudder 14 in the high-speed water flow of the propeller 13 is unavoidable

[0004] But, in prior art, solve above-mentioned problem point, mostly be under the principle that this ship rudder does not affect structural strength, can only design streamlined on shape or do surface treatment, reduce the resistance of ship's rudder

However, these methods can actually reduce the effect of resistance, either still need to be improved, or cost a lot of money; therefore, how to reduce the resistance of the ship's rudder at low cost, and then reduce fuel consumption, has been asked by ship manufacturers. Even the problems that academic research units want to solve

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