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Ship drag-reduction method using atmospheric pressure

An atmospheric pressure and ship technology, which is applied in the ship field, can solve the problems of the installation position, angle and size design of the transom.

Inactive Publication Date: 2009-08-19
李运刚
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Problems solved by technology

[0003] The above-mentioned mechanism of improving the resistance performance of the ship by the square stern and transom has certain subjective factors. At present, there is no good theory as a guide for the installation position, angle and size design of the transom, and the design is completely based on experience.

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  • Ship drag-reduction method using atmospheric pressure
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Embodiment Construction

[0021] The effect of the water-air isolation strip of the present invention is to separate water and air at the horizontal plane position outside the hull, and its shape can be any shape. In order to reduce costs, a fixed installation method is generally adopted. Theoretically, the water-air isolation zone adopts a thin plate, the trim angle is designed to be 0 degrees, and the bottom is close to the water surface. The air isolation zone is designed to be adjustable. Small adjustments to the depth of the water-air isolation zone in water and the angle between the water-air isolation zone and the hull can better adapt to the different navigation states of the ship to achieve better results. In addition, the water vapor isolation zone can be installed all around the hull or partially installed.

[0022] 1. Implementation plan for installation of water-air isolation belt at the stern of square stern hull

[0023] At present, most displacement high-speed ships have adopted square...

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Abstract

The invention relates to a method for reducing the ship resistance by using the atmospheric pressure, which is characterized in that the outside waterline part of a ship hull is provided with a water-air isolation belt of which the bottom is immersed into water. When the ship moves on the water surface, vacuum zones (or negative pressure zones) are generated on both sides of the stern and the ship hull; because of the water-air isolation belt which is arranged on the outer side of the ship hull and is immersed into the water, air cannot enter the vacuum zones under the water-air isolation belt, and water flow quickly fills up the vacuum zones below the water-air isolation belt so as to greatly reduce the descending extent of water levels on both sides of the stern and the ship hull and reduce the ship resistance.

Description

technical field [0001] The invention relates to the field of ships, and relates to a method for realizing drag reduction of ships by using atmospheric pressure, which plays the role of energy saving and emission reduction. Background technique [0002] When a ship sails on the water, the hull moves in two fluid media, water and air, and is subjected to resistance from water and air to the hull at the same time. The total resistance suffered by the ship during navigation is generally divided into air resistance and water resistance according to the type of fluid, and water resistance Divided into hull resistance, attached body resistance, turbulent sea resistance, hull resistance is further subdivided into friction resistance, viscous pressure resistance, wave resistance, etc. Since the density and viscosity coefficient of air are much smaller than those of water, Air resistance only accounts for a very small part, and the influence of air on ship resistance is often ignored....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B1/38
CPCY02T70/122Y02T70/10
Inventor 李运刚
Owner 李运刚
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