Ship water jet bubble restraining drag reduction structure

Abstract

The invention discloses a ship water jet bubble restraining drag reduction structure which comprises a ventilation groove formed in the front edge of a hull bottom and further comprises a rear water jet injection unit. The rear water jet injection unit comprises two sets of nozzles and a high-pressure water supply pipeline. The nozzles face a stern. The two sets of nozzles are distributed on the two sides of the hull bottom in the length direction of a hull and used for forming high-speed water jets on the two sides of the hull bottom to prevent bubbles discharged out of the ventilation groove to the hull bottom from floating upwards and escaping. By the adoption of the structure, the water jet bubble restraining drag reduction technology is adopted, hull bubble motion can be effectively restrained, the phenomenon that the bubbles at the hull bottom escape along the two sides of the hull can be greatly reduced, the hull bottom bubble coverage rate is increased to obtain the better drag reduction effect, and especially for a large-size ship with the relatively long hull, the continuous drag reduction effect achieved in the length direction of the ship is greatly improved, and the navigation drag of the ship is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of ship bubble drag reduction, in particular to a ship water jet constrained bubble drag reduction structure. Background technique [0002] Ship bubble drag reduction can reduce ship navigation resistance, increase navigation speed and reduce fuel consumption. Among many drag reduction technologies, air bubble drag reduction has been attracting attention in the field of ship speed increase and energy saving due to its advantages of simple structure, easy operation and good economy. By transforming traditional ships and adding appropriate bubble drag-reducing structures, it is expected to significantly increase the speed of ships and reduce ship energy consumption and greenhouse gas emissions. [0003] The working principle of bubble drag reduction is mainly to form a gas-water two-phase flow on the surface of the ship bottom by continuously injecting compressed air or working exhaust gas to the bottom of th...

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Problems solved by technology

[0004] However, although the air bubble drag reduction technology is feasible in mechanism and has obvious drag reduction effect in the plate test, the drag reduction effect of the air bubble drag reduction actual ship test is still unsatisfactory

Due to the complex shape of the ship's bottom, serious problems such as air bubbles floating up and escaping, the current better air bubble drag reduction of real ships only saves a few percent of power.

In some tests, the propulsion efficiency of the propeller deteriorated due to air bubbles entering the working area of ​​the propeller, which instead increased the total energy consumption of the ship’s navigation

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