Air-bubble drag reduction device for ship

Abstract

The invention relates to an air-bubble drag reduction device for a ship. The air-bubble drag reduction device for the ship comprises an air inlet pipe which is mounted directly in front of a hull; anair bubble generation device is connected to the air inlet pipe; a water wing, which is arched towards the air outlet end direction of the air inlet pipe, is arranged on the air bubble generation device; an area between the upper end surface of the water wing and the air outlet end of the air inlet pipe forms a negative pressure area during the advancing of the hull; and airflow introduced to thenegative pressure area from the air inlet pipe forms a bubble flow at the bottom of the hull under a shearing effect of the hull. According to the air-bubble drag reduction device for the ship, due tothe specificity of the structure, the structural characteristics of the water wing and a stagnation point generated at the front end of the hull are sufficiently utilized to generate air bubbles under a situation of no energy consumption without using a power source; and meanwhile, the water wings with a plurality of types can enable the ships with different speeds can generate stable micro bubbles at the bottoms of the hulls in the navigation process; and therefore, a drag reduction effect is realized.

Description

technical field [0001] The invention relates to the technical field of ship drag reduction, in particular to a bubble drag reduction device for ships. Background technique [0002] In the current environment where energy conservation and emission reduction are advocated in China, different energy-saving technologies have emerged as the times require, among which air bubble drag reduction is a research hotspot, and one of the main application directions of air bubble drag reduction is ship drag reduction. In recent years, a certain degree of research has been done on the drag reduction mechanism of bubble drag reduction at home and abroad, which can be well applied to ship drag reduction to reduce energy consumption. The current drag reduction methods mainly include air cavity drag reduction, air film drag reduction and air bubble drag reduction. However, compared with the other two drag reduction methods, the air bubble drag reduction device is easy to apply. The structure ...

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Problems solved by technology

However, the traditional bubble drag reduction device must press air bubbles into the water through a device such as a compressor. Although the diameter of the bubbles generated by this method is relatively stable, it needs to consume extra energy in the process, which is not conducive to the drag reduction efficiency. Therefore, it is of great significance to develop a bubble drag reduction device that does not need a power source and can stably generate microbubbles

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