A ship bubble drag reduction system

Abstract

This invention relates to the field of ship drag reduction technology, and in particular to a ship bubble drag reduction system, which consists of a high-pressure gas generator, a gas supply pipeline, and a bubble generator. M bubble generators are evenly distributed and fixed to the ship's bottom plate. The gas supply pipeline consists of M primary gas supply pipes simultaneously connecting the high-pressure gas generator and the bubble generator. The bubble generator includes a main body, a transitional connecting pipeline unit, a direct connecting pipeline unit, and N aeration components. N primary water flow channels and one secondary water flow channel are formed inside the main body. Each aeration component receives high-pressure gas from the high-pressure gas generator and supplies it into the primary water flow channel. For a single bubble generator, during ship navigation, water rapidly flows through the primary water flow channel, and high-pressure gas is continuously released into each primary water flow channel sequentially via the primary gas supply pipe, the transitional connecting pipeline unit, the direct connecting pipeline unit, and the aeration components to generate a gas-water mixture.

Description

Technical Field

[0001] This invention relates to the field of ship drag reduction technology, and in particular to a ship bubble drag reduction system. Background Technology

[0002] Among numerous ship drag reduction technologies, bubble drag reduction has garnered significant attention in the fields of ship speed improvement and energy conservation due to its advantages such as simple structure, ease of operation, and good economic efficiency. Ship bubble drag reduction technology can effectively reduce ship drag, increase speed, and reduce fuel consumption. The working principle of bubble drag reduction technology mainly involves continuously injecting compressed air or exhaust gas into the ship's bottom, forming a gas-water two-phase flow on the bottom surface. The presence of numerous bubbles at the bottom causes changes in the properties of the medium and the flow structure. These changes in the density, viscosity, and boundary layer flow structure of the medium in contact with the bottom significantly reduce the ship's frictional resistance. Numerous flat-plate bubble drag reduction tests demonstrate its significant drag reduction effect, with a maximum drag reduction rate exceeding 80%, making it considered a highly efficient drag reduction method.

[0003] In existing technologies, a high-pressure air pipe extends into the water, with numerous micro-pores at its free end. During ship navigation, high-pressure gas is introduced into the high-pressure air pipe, and high-pressure air is directly injected into the water through the micro-pores to generate a large number of bubbles. The resulting gas-water mixture, rich in bubbles, is then transported to the hull. However, in practical applications, the following problems have been found with this traditional method: According to common knowledge, the effectiveness of a bubble lubrication drag reduction system is highly dependent on bubble size and bubble density in the water. Bubble size is limited by the size of the micro-pores; generating small-scale bubbles often requires a large number of micro-pores. Exhausting gas through numerous micro-pores results in high energy consumption and low exhaust efficiency, leading to a weak drag reduction effect due to the number of small bubbles generated per unit time and total navigation time. Furthermore, the extreme pressure drop gradient easily leads to insufficient injection pressure of the gas-water mixture, making it difficult for bubbles to achieve a uniform distribution on the hull, ultimately weakening the actual drag reduction effect. Therefore, this provides a research direction for our group. Summary of the Invention

[0004] Therefore, in view of the above-mentioned existing problems and defects, the research group of this invention collected relevant information, conducted multiple evaluations and considerations, and carried out continuous experiments and modifications by the research group members, which ultimately led to the emergence of this ship bubble drag reduction system.

[0005] To address the aforementioned technical problems, this invention relates to a ship bubble drag reduction system, comprising a high-pressure gas generator, gas supply pipelines, and a bubble generator. The high-pressure gas generator is internally located within the ship's hull, and high-pressure gas is generated under the action of air and compression energy. M bubble generators are evenly distributed and fixed to the ship's bottom plate. The gas supply pipeline consists of M primary gas supply pipes that simultaneously connect the high-pressure gas generator and the bubble generator, and penetrate the ship's bottom plate. The bubble generator includes a main body, a transitional connecting pipeline unit, a direct connecting pipeline unit, and N aeration components. Through the coordinated action of the direct connecting pipeline unit, the transitional connecting pipeline unit, and the primary gas supply pipelines, all aeration components simultaneously receive the high-pressure gas generated by the high-pressure gas generator. N primary water flow channels and one secondary water flow channel are formed inside the main body. The primary water flow channels are arranged sequentially and at intervals along the height of the main body. Each aeration component is paired with a primary water flow channel to independently and correspondingly supply high-pressure gas to it. While the ship is underway, the high-pressure gas generator is activated to produce high-pressure gas, which is then delivered to each bubble generator via a primary gas supply pipe. For each individual bubble generator, the high-pressure gas is continuously released into each primary water channel sequentially via the primary gas supply pipe, the transition connecting pipe unit, the direct connecting pipe unit, and the aeration assembly. As the ship has already achieved initial speed, the water rapidly flows through the primary water channels, and the high-pressure gas mixes with the water to generate a gas-water mixture rich in bubbles.

[0006] As a further improvement to the technical solution disclosed in this invention, the inlet end of the primary water flow channel is shaped like a "funnel". During the initial period when the water enters the primary water flow channel, the flow velocity of the water increases due to the gradually decreasing diameter of the channel.

[0007] As a further improvement to the technical solution disclosed in this invention, the bubble generating device further includes a flow-disrupting unit. The flow-disrupting unit consists of N flow-disrupting plates that are placed horizontally in a primary water flow channel and are used to cut the water flow.

[0008] As a further improvement to the technical solution disclosed in this invention, in specific application scenarios, the spoiler is preferably a corrugated plate; in other application scenarios, the spoiler includes a plate body, an upper spoiler assembly, and a lower spoiler assembly. The upper spoiler assembly consists of upper spoiler fins fixed to the upper surface of the plate body and arranged sequentially at fixed intervals. The upper spoiler assembly consists of multiple lower spoiler fins fixed to the lower surface of the plate body and arranged sequentially at fixed intervals.

[0009] As a further improvement to the technical solution disclosed in this invention, the bubble generating device also includes a rectifier assembly. The rectifier assembly is used to disperse bubbles in the gas-water mixture and is built into the secondary water flow channel.

[0010] As a further improvement to the technical solution disclosed in this invention, the rectifier assembly is composed of grid plates or mesh plates that are horizontally fixed in the secondary water flow channel and arranged parallel to each other.

[0011] As a further improvement to the technical solution disclosed in this invention, the primary water flow channel includes an upper-level water flow channel, a middle-upper-level water flow channel, a middle-lower-level water flow channel, and a lower-level water flow channel. The direct connection pipeline unit includes a first direct connection pipe, a second direct connection pipe, a third direct connection pipe, a fourth direct connection pipe, and a fifth direct connection pipe. In operation, the first direct connection pipe is used to supply high-pressure gas only to the upper-level water flow channel; the second direct connection pipe is used to supply high-pressure gas to both the upper-level and middle-upper-level water flow channels simultaneously; the third direct connection pipe is used to supply high-pressure gas to both the middle-upper-level and middle-lower-level water flow channels simultaneously; the fourth direct connection pipe is used to supply high-pressure gas to both the middle-lower-level and lower-level water flow channels simultaneously; and the fifth direct connection pipe is used to supply high-pressure gas only to the lower-level water flow channel.

[0012] As a further improvement to the technical solution disclosed in this invention, for a single bubble generating device, the number of the first direct connecting pipe, the second direct connecting pipe, the third direct connecting pipe, the fourth direct connecting pipe and the fifth direct connecting pipe are all set to 2, and they are arranged symmetrically along the width direction of the body.

[0013] As a further improvement to the technical solution disclosed in this invention, the high-pressure gas generating device is preferably a gas generator or an air compressor.

[0014] Compared with traditional design structures, the ship bubble drag reduction system disclosed in this invention has achieved at least the following beneficial technical effects in practical applications:

[0015] 1) High-pressure gas is continuously supplied directly into each primary water channel. During this process, the high-pressure gas is fully and uniformly mixed with water. The high-pressure gas fully participates in the bubble formation process in the primary water channel. Due to the beneficial influence of turbulence, a large number of bubbles are generated, which is conducive to the formation of a gas-water mixture rich in bubbles. Ultimately, this results in the formation of a drag-reducing bubble layer at the bottom of the ship that meets the expected requirements.

[0016] 2) Due to the influence of the ship's speed, the water flows quickly through the through-pass water channel, ensuring that it maintains a high initial velocity during the mixing process with the high-pressure gas. This eliminates the need for traditional water flow pressurization equipment, thereby effectively reducing the manufacturing cost of the ship's bubble drag reduction system.

[0017] 3) The gas-water mixture is generated independently in each primary water body channel and eventually flows together into the secondary water body channel. This facilitates precise control over the bubble formation process. More importantly, each gas-water mixture undergoes secondary mixing in the secondary water body channel, resulting in a larger number of bubbles in the formed gas-water mixture and a more uniform distribution pattern.

[0018] 4) The design of this ship bubble drag reduction system is extremely simple and contains relatively few parts, which is conducive to manufacturing and assembly, has good economic efficiency, and is conducive to large-scale application and promotion. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the ship bubble drag reduction system in this invention.

[0021] Figure 2 This is a schematic diagram illustrating the application of the ship bubble drag reduction system in this invention in the completed state of being integrated with the ship.

[0022] Figure 3 This is a three-dimensional schematic diagram of the bubble generating device in the ship bubble drag reduction system of the present invention (with hidden lines visible).

[0023] Figure 4 This is also a three-dimensional schematic diagram of the bubble generating device in the ship bubble drag reduction system of the present invention (with the main body hidden).

[0024] Figure 5 This is a front view of the bubble generating device in the ship bubble drag reduction system of the present invention.

[0025] Figure 6 This is also a front view of the bubble generating device in the ship bubble drag reduction system of the present invention (with the main body hidden).

[0026] Figure 7 This is a three-dimensional schematic diagram of the main body of the ship bubble drag reduction system of the present invention from one perspective.

[0027] Figure 8 This is a three-dimensional schematic diagram of the main body of the ship bubble drag reduction system of the present invention from another perspective.

[0028] 1-High-pressure gas generator; 2-Gas pipeline; 21-First-stage gas pipeline; 22-Pressure regulating valve; 23-Stop valve; 24-Gas storage tank; 25-One-way valve; 3-Bubble generator; 31-Main body; 311-Upper-stage water body flow channel; 312-Upper-middle-stage water body flow channel; 313-Lower-middle-stage water body flow channel; 314-Lower-stage water body flow channel; 315-Second-stage water body flow channel; 32-Transition connecting pipeline unit; 33-Direct connecting pipeline unit; 331-First direct connecting pipe; 332-Second direct connecting pipe; 333-Third direct connecting pipe; 334-Fourth direct connecting pipe; 335-Fifth direct connecting pipe; 34-Aeration assembly; 35-Break current unit; 351-Break current plate; 36-Rectifying assembly; 361-Grate plate. Detailed Implementation

[0029] In the description of this invention, it should be understood that the terms "front", "rear", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] The present invention will be further described in detail below with reference to specific embodiments. Figure 1 A schematic diagram of the ship bubble drag reduction system of this invention is shown. It can be seen that it mainly consists of three parts: a high-pressure gas generator 1, a gas pipeline 2, and a bubble generator 3. The high-pressure gas generator 1 is built into the ship's hull, and high-pressure gas is generated under the action of air and compression energy. Its pressure can be adaptively adjusted according to the ship's draft, generally not lower than 0.8 MPa. Depending on the specific application scenario, the high-pressure gas generator 1 is preferably selected between a gas generator and an air compressor. The number of bubble generators 3 is set to M, evenly distributed and fixed to the bottom plate of the ship (e.g., Figure 2 (As shown in the diagram). The gas pipeline 2 includes a primary gas pipeline 21, a pressure regulating valve 22, a shut-off valve 23, a gas storage tank 24, and a one-way valve 25. The primary gas pipeline 21 is used to simultaneously connect the high-pressure gas generator 1 and the bubble generator 3, and its number is correspondingly set to M, all of which penetrate the bottom plate of the ship. When the ship is underway, the high-pressure gas generator 1 is activated to generate high-pressure gas, which is then transported to each bubble generator 3 via the primary gas pipeline 21.

[0031] Figure 3 , 4Figures 5 and 6 show schematic diagrams of the bubble generating device in the ship bubble drag reduction system of the present invention under two different states. It can be seen that the bubble generating device 3 mainly consists of a body 31, a transition connecting pipe unit 32, a direct connecting pipe unit 33, and five aeration components. The transition connecting pipe unit 32 serves as a transition between the high-pressure gas generating device 1 and the direct connecting pipe unit 33. The direct connecting pipe unit 33 includes a first direct connecting pipe 331, a second direct connecting pipe 332, a third direct connecting pipe 333, a fourth direct connecting pipe 334, and a fifth direct connecting pipe 335. The five aeration components 5 are respectively connected to the first direct connecting pipe 331, the second direct connecting pipe 332, the third direct connecting pipe 333, the fourth direct connecting pipe 334, and the fifth direct connecting pipe 335, and under the coordinated action of the transition connecting pipe unit 32 and the primary gas supply pipe 21, they all simultaneously receive the high-pressure gas generated by the high-pressure gas generating device 1.

[0032] like Figure 7 , 8 As shown, four primary water flow channels are formed inside the main body 31. For easy distinction, they are named upper-level water flow channel 311, upper-middle-level water flow channel 312, lower-middle-level water flow channel 313, and lower-level water flow channel 314, and are arranged sequentially and at intervals along the height of the main body. In addition, a secondary water flow channel 315 is formed inside the main body 31, and communicates with the upper-level water flow channel 311, upper-middle-level water flow channel 312, lower-middle-level water flow channel 313, and lower-level water flow channel 314. The first direct connecting pipe 331 is used to supply high-pressure gas only to the upstream water body 311 channel; the second direct connecting pipe 332 is used to supply high-pressure gas simultaneously to the upstream water body channel 311 and the intermediate-upper level water body channel 312; the third direct connecting pipe 333 is used to supply high-pressure gas simultaneously to the intermediate-upper level water body channel 312 and the intermediate-lower level water body channel 313; the fourth direct connecting pipe 334 is used to supply high-pressure gas simultaneously to the intermediate-lower level water body channel 313 and the next level water body channel 314; and the fifth direct connecting pipe 335 is used to supply high-pressure gas only to the next level water body channel 314 (e.g., Figure 4 , 6 (as shown in the image).

[0033] When the ship is underway, the high-pressure gas generator 1 is activated to compress air into high-pressure gas, which is then delivered to the transition connecting pipeline unit 32 via the primary gas delivery pipe 21, and subsequently distributed to each bubble generator 3. Regarding a single bubble generating device 3, high-pressure gas is first supplied to the first direct connecting pipe 331, the second direct connecting pipe 332, the third direct connecting pipe 333, the fourth direct connecting pipe 334, and the fifth direct connecting pipe 335. Subsequently, it is released through multiple aeration components 5 in coordination to the upper-level water flow channel 311, the middle-upper-level water flow channel 312, the middle-lower-level water flow channel 313, and the lower-level water flow channel 314. At the same time, due to the high initial speed of the ship, the water is quickly forced into the upper-level water flow channel 311, the middle-upper-level water flow channel 312, the middle-lower-level water flow channel 313, and the lower-level water flow channel 314 under the action of inertial force, and flows rapidly. The high-pressure gas and water mix to generate a gas-water mixture rich in a large number of bubbles.

[0034] In practical applications, the ship bubble drag reduction system disclosed in this invention has achieved at least the following beneficial technical effects:

[0035] 1) During the ship's navigation process, high-pressure gas is continuously supplied directly into the upper stage water flow channel 311, the middle upper stage water flow channel 312, the middle lower stage water flow channel 313, and the lower stage water flow channel 314. During this process, the high-pressure gas is fully and uniformly mixed with water in the upper stage water flow channel 311, the middle upper stage water flow channel 312, the middle lower stage water flow channel 313, and the lower stage water flow channel 314. The high-pressure gas fully participates in the bubble formation process, and due to the beneficial influence of turbulence, it is conducive to the generation of a large number of bubbles, which is conducive to the generation of a gas-water mixture rich in a large number of bubbles, ultimately forming a drag-reducing bubble layer at the bottom of the ship that meets the expected requirements.

[0036] 2) Due to the influence of the ship's speed, the water flows rapidly through the upper-level water flow channel 311, the middle-upper-level water flow channel 312, the middle-lower-level water flow channel 313 and the lower-level water flow channel 314, ensuring that it maintains a high initial velocity during the mixing process with the high-pressure gas. In this way, the application of traditional water flow pressurization equipment is eliminated, thereby effectively reducing the manufacturing cost of the ship's bubble drag reduction system.

[0037] 3) The gas-water mixture is generated independently in the upper-level water body channel 311, the middle-upper-level water body channel 312, the middle-lower-level water body channel 313, and the lower-level water body channel 314, and finally flows together into the secondary-level water body channel 315. This facilitates precise control over the formation process of bubbles. More importantly, each gas-water mixture undergoes secondary mixing in the secondary-level water body channel 315, resulting in a greater number of bubbles in the formed gas-water mixture and a more uniform distribution.

[0038] It should be noted that during the process of supplying high-pressure gas to the bubble generator 3 using the high-pressure gas generator 1, the working pressure of the high-pressure gas can be conveniently and quickly adjusted by operating the pressure regulating valve 22. The one-way valve 25 can effectively prevent the "water backflow" phenomenon caused by the shutdown of the high-pressure gas generator 1, ensuring that the high-pressure gas generator 1 maintains a high-performance operating state for a long time. The high-pressure gas generated by the high-pressure gas generator 1 is first pumped into the gas storage tank 24 and temporarily stored. When the gas storage tank 24 reaches the set value, the high-pressure gas generator 1 stops immediately and then supplies the high-pressure gas to each bubble generator 3 as needed. In this way, not only is it conducive to the centralized supply of high-pressure gas, providing favorable conditions for further simplification of the design structure of the ship's bubble drag reduction system, but it can also effectively reduce the start-up frequency of the gas generator and air compressor.

[0039] Combination Figure 6 , 7 As shown, the inlet ends of the upper-level water flow channel 311, the middle-upper-level water flow channel 312, the middle-lower-level water flow channel 313, and the lower-level water flow channel 314 all present a "funnel-shaped" appearance. Consequently, during the initial period when water enters these channels, the flow velocity increases due to the gradually decreasing channel diameter. This not only facilitates thorough mixing with the high-pressure gas but also helps maintain the gas-water mixture at a high-speed jet, thus promoting the formation of a drag-reducing bubble layer at the bottom of the vessel that meets the desired requirements.

[0040] like Figure 3 , 4 As shown, for a single bubble generating device 3, the number of the first direct connecting pipe 331, the second direct connecting pipe 332, the third direct connecting pipe 333, the fourth direct connecting pipe 334, and the fifth direct connecting pipe 335 are all set to 2, and are arranged symmetrically along the width direction of the body. By adopting the above technical solution, it is beneficial to improve the uniformity of the distribution of high-pressure gas in the upper-level water flow channel 311, the middle-upper-level water flow channel 312, the middle-lower-level water flow channel 313, and the lower-level water flow channel 314, and also to achieve a more thorough and uniform mixing with the subsequent water flow.

[0041] To further improve the mixing uniformity of high-pressure gas and water flow, and thus ensure that the gas-water mixture is rich in a large number of fine bubbles, as a further optimization of the above technical solution, such as Figure 6 As shown, the bubble generating device 3 is further equipped with a flow-disrupting unit 35. The flow-disrupting unit 35 consists of four flow-disrupting plates 351, which are correspondingly placed horizontally in the upper-level water flow channel 311, the middle-upper-level water flow channel 312, the middle-lower-level water flow channel 313, and the lower-level water flow channel 314, and are used to cut the water flow. The flow-disrupting plates 351 are preferably corrugated plates. In this way, in practical applications, the flow-disrupting plates 351 can be used to effectively cut and disturb the gas-water mixture, and make the gas-water mixture have a certain excitation amplitude along the flow direction. As a result, it will inevitably interact with the side wall of the flow channel and cause deflection. Under the action of the reverse impact flow, it is beneficial for the high-pressure gas and water flow to undergo secondary mixing.

[0042] Of course, as another modified design of the above technical solution, in certain specific application scenarios, the spoiler 351 can also be designed as a component, which includes a plate body, an upper spoiler component, and a lower spoiler component. The upper spoiler component consists of upper spoiler fins fixed to the upper surface of the plate body and arranged sequentially at fixed intervals. The upper spoiler component consists of multiple lower spoiler fins fixed to the lower surface of the plate body and arranged sequentially at fixed intervals (not shown in the figure).

[0043] Finally, it should be noted that the bubble generator 3 is also equipped with a rectifier assembly 36 (such as...). Figure 3 , 4 (As shown in the diagram). The rectifier assembly 36 is composed of grid plates 361 that are horizontally fixed in the secondary water flow channel 315 and arranged parallel to each other. For example, during the process of the air-water mixture being injected at high speed through the secondary water flow channel 315, it is diverted again by the action of the grid plates 361, and the air bubbles contained therein are further dispersed and refined.

[0044] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ship air bubble drag reduction system, which is composed of a high-pressure gas generating device, a gas pipeline and an air bubble generating device; the high-pressure gas generating device is built in a cabin, and air is assisted to generate high-pressure gas under the action of compression energy; the number of the air bubble generating devices is set to M, which are evenly distributed and fixed on the ship bottom plate; the gas pipeline is composed of M primary gas pipelines which simultaneously connect the high-pressure gas generating device and the air bubble generating device and penetrate the ship bottom plate, characterized in that, The bubble generating device includes a main body, a transitional connecting pipe unit, a direct connecting pipe unit, and N aeration components. Under the coordinated action of the direct connecting pipe unit, the transitional connecting pipe unit, and the primary air supply pipe, each aeration component simultaneously receives high-pressure gas generated by the high-pressure gas generating device. N primary water channels and one secondary water channel are formed inside the main body. Along the height of the main body, the primary water channels are arranged in a sequential, spaced-out pattern. Each aeration component is matched with one of the primary water channels, corresponding to each other. High-pressure gas is independently introduced into the vessel; while the vessel is under navigation, the high-pressure gas generator is activated to generate high-pressure gas, which is then transported to each of the bubble generators via the primary gas supply pipe; for each bubble generator, the high-pressure gas is continuously released into each of the primary water channels sequentially via the primary gas supply pipe, the transition connecting pipeline unit, the direct connecting pipeline unit, and the aeration assembly; as the vessel has already achieved initial speed, the water rapidly flows through the primary water channels, and the high-pressure gas and water mix to generate a gas-water mixture rich in numerous bubbles; The inlet of the primary water body channel is shaped like a "funnel". During the initial period when the water enters the primary water body channel, the flow velocity of the water increases due to the gradually decreasing diameter of the channel. The bubble generating device also includes a flow turbulence unit; the flow turbulence unit consists of N flow turbulence plates that are placed horizontally in the primary water flow channel and are used to cut the water flow. The primary water flow channel includes an upper-level water flow channel, a middle-upper-level water flow channel, a middle-lower-level water flow channel, and a lower-level water flow channel; the direct connection pipeline unit includes a first direct connection pipe, a second direct connection pipe, a third direct connection pipe, a fourth direct connection pipe, and a fifth direct connection pipe; in operation, the first direct connection pipe is used to supply high-pressure gas only to the upper-level water flow channel, the second direct connection pipe is used to supply high-pressure gas to both the upper-level and middle-upper-level water flow channels simultaneously, the third direct connection pipe is used to supply high-pressure gas to both the middle-upper-level and middle-lower-level water flow channels simultaneously, the fourth direct connection pipe is used to supply high-pressure gas to both the middle-lower-level and lower-level water flow channels simultaneously, and the fifth direct connection pipe is used to supply high-pressure gas only to the lower-level water flow channel; For a single bubble generating device, the number of the first direct connecting pipe, the second direct connecting pipe, the third direct connecting pipe, the fourth direct connecting pipe, and the fifth direct connecting pipe is all set to 2, and they are arranged symmetrically along the width direction of the body.

2. The ship bubble drag reduction system according to claim 1, characterized in that, The spoiler is a corrugated plate, or the spoiler includes a plate body, an upper spoiler assembly, and a lower spoiler assembly; the upper spoiler assembly is composed of multiple upper spoiler fins fixed to the upper surface of the plate body and arranged sequentially at fixed intervals; the upper spoiler assembly is composed of multiple lower spoiler fins fixed to the lower surface of the plate body and arranged sequentially at fixed intervals.

3. The ship bubble drag reduction system according to claim 1, characterized in that, The bubble generating device also includes a rectifier; the rectifier is used to disperse bubbles in the gas-water mixture and is built into the secondary water channel.

4. The ship bubble drag reduction system according to claim 3, characterized in that, The rectifier assembly consists of a grid plate or mesh plate that is horizontally fixed in the secondary water flow channel and arranged parallel to each other.

5. The ship bubble drag reduction system according to any one of claims 1-4, characterized in that, The high-pressure gas generating device is a gas generator or an air compressor.

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