Gas drag reduction jet apparatus and ship

Abstract

A gas drag reduction jet apparatus for a ship, said apparatus comprising a gas supply assembly, flow guide ducts (1), and flow guide covers (2). One end of each flow guide duct (1) is connected to the gas supply assembly, and the other end of each flow guide duct (1) is configured to be in communication with a through hole (1001) on a ship bottom plate (1000). The flow guide covers (2) are each configured to cover a through hole (1001) from the side of the ship bottom plate (1000) away from the flow guide ducts (1), so that each flow guide cover (2) and the ship bottom plate (1000) form a narrow slit. The slit is used for ejecting a gas and allowing the gas to flow along the ship bottom plate. The gas drag reduction jet apparatus occupies a small area of the ship bottom plate, is easy to arrange, and can reduce the adverse effect of the gas drag reduction jet apparatus itself on the performance and structure of a ship body.

Description

Gas drag reduction jet devices and ships Technical Field

[0001] This invention relates to the field of marine energy conservation, and in particular to a gas drag reduction jet device and a ship. Background Technology

[0002] Gas-lubricated ships refer to vessels equipped with gas-lubricating technology. Gas lubrication technology involves injecting gas between the hull and seawater to form an air layer, thereby reducing frictional resistance between the hull and the water, thus improving ship operating efficiency and reducing fuel consumption. The gas-lubricating jet unit, as the core component of this technology, has a significant impact on its final drag reduction and energy-saving effects through its structure and arrangement.

[0003] Although different technical approaches to gas lubrication technology have been disclosed, there is still room for optimization regarding the adverse effects of installing gas drag reduction jet devices on hull performance and structure. Summary of the Invention

[0004] In view of the shortcomings of the above-mentioned related technologies, the purpose of the present invention is to provide a gas drag reduction jet device and a ship, so as to reduce the adverse effects of the gas drag reduction jet device itself on the ship's performance and structure.

[0005] To achieve the above and other related objectives, the present invention provides a gas drag reduction jetting device, comprising a gas supply assembly; a guide pipe, one end of which is connected to the gas supply assembly, and the other end of which is configured to communicate with a through hole on a bottom plate; and a guide cover, which is configured to cover the through hole from the side of the bottom plate away from the guide pipe, such that the guide cover and the bottom plate form a narrow slit, the narrow slit being used for gas to be ejected and for the gas to flow along the bottom plate.

[0006] Optionally, there are multiple flow guides, each of which is connected to the gas supply assembly, and multiple flow guide covers, each corresponding to one of the multiple flow guides.

[0007] Optionally, a plurality of the guide pipes are arranged at intervals around the air supply assembly and there is a preset angle between two adjacent guide pipes.

[0008] Optionally, the cross-sectional area of ​​the guide tube in the vertical direction gradually increases from one end near the air supply assembly to one end of the guide cover.

[0009] Optionally, the guide tube is in the shape of a truncated triangular prism.

[0010] Optionally, the guide tube is configured to form a preset angle with the bottom plate of the ship.

[0011] Optionally, the side of the flow guide cover opposite to the flow guide tube is a quarter-ellipsoid.

[0012] Optionally, the flow guide cap has a groove on the side facing the flow guide tube, the groove being used to form the narrow slit when the flow guide cap is placed over the through hole.

[0013] Optionally, the gas supply assembly includes an air inlet pipe, an air chamber, and a bubble generator. The air chamber has an air inlet, an air outlet, and an internal air chamber that communicates with the air inlet and the air outlet. The bubble generator is located in the air chamber and is separated from the air inlet and the air outlet. The air inlet pipe communicates with the air inlet, and the number of guide pipes is equal to the number of air outlets and they are connected in a one-to-one correspondence.

[0014] Optionally, the size of the air outlet is inversely proportional to the number of air outlets.

[0015] Optionally, the bubble generator includes an inner tube and an outer tube, the inner tube being located inside the outer tube and the two being spaced apart, the inner tube and the outer tube dividing the air chamber into multiple regions, the air inlet being located in the region between the inner tube and the air chamber, the air outlet being located in the region between the outer tube and the air chamber, and multiple arrayed through holes being provided on both the inner tube and the outer tube.

[0016] Optionally, the air supply assembly further includes a base configured to be mounted on a flat plate at the bottom of the ship, with the air chamber located above the base.

[0017] Optionally, the base is a cross-shaped trapezoid, the maximum length of the top of the base is equal to the maximum dimension of the outer contour of the air chamber, and the maximum length of the bottom of the base is greater than the maximum length of the top.

[0018] A vessel includes a bottom plate and a gas drag reduction jet device as described above disposed on the bottom plate.

[0019] A jet adjustment method for the gas drag reduction jet device as described above, based on the ship's hull type, is adjusted by at least one of four methods: changing the number of guide tubes, the angle between two adjacent guide tubes, the angle between the guide tube and the bottom plate, and the angle between the two sides of the guide tube.

[0020] As described above, the gas drag reduction jetting device and ship of the present invention have the following advantages: When the device is installed on a ship, only a small through hole needs to be opened in the flat plate of the hull, so the device occupies a small area of ​​the flat plate, has little impact on the ship's structural construction, and is easy to install. Furthermore, most of the device's structure is located inside the hull, with only a small structure protruding from the hull, resulting in minimal additional drag on the ship. Under the action of the flow guide, the gas can be ejected completely close to the flat plate, which allows for higher gas coverage efficiency on the hull surface, thereby resulting in a higher drag reduction rate per unit volume of gas. Attached Figure Description

[0021] Figure 1 shows an exploded view of the gas drag reduction jet device in an embodiment of the present invention.

[0022] Figure 2 shows a schematic diagram of the air chamber in an embodiment of the present invention.

[0023] Figure 3 shows a schematic diagram of the bubble generator in an embodiment of the present invention.

[0024] Figure 4 shows a top view of multiple guide tubes in an embodiment of the present invention.

[0025] Figure 5 shows a side view of the guide tube in an embodiment of the present invention.

[0026] Figure 6 shows a schematic diagram of the shape of the guide tube in an embodiment of the present invention.

[0027] Figure 7 shows a schematic diagram of the state when the flow guide cover is placed over the through hole in an embodiment of the present invention.

[0028] Figure 8 shows a schematic diagram of the flow guide cover in an embodiment of the present invention.

[0029] Figure 9 shows a schematic diagram of a ship including a gas drag reduction jet device in an embodiment of the present invention.

[0030] Figure 10 shows a schematic diagram of the first embodiment of the gas drag reduction jet device layout in this invention.

[0031] Figure 11 shows a schematic diagram of a second embodiment of the gas drag reduction jet device layout in this invention.

[0032] Component designation: 1000, Bottom plate; 1001, Through hole; 100, Gas drag reduction jet device; 1, Flow guide pipe; 2, Flow guide cover; 21, Groove; 22, Groove wall; 23, Groove bottom; 3, Air inlet pipe; 4, Air chamber; 41, Air inlet; 42, Air outlet; 5, Inner pipe; 6, Outer pipe; 7, Base; 200, Gas supply system; 300, Gas distribution pipeline; 400, Control system. Detailed Implementation

[0033] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0034] In the detailed description of embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0035] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one element or feature shown in the accompanying drawings and other elements or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the drawings for the device in use or operation. Furthermore, when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or there may be one or more layers in between. The phrase “between” as used herein includes both endpoint values.

[0036] In the context of this application, the structure described above the first feature may include embodiments in which the first and second features are formed in direct contact, or embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0037] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] As shown in Figure 1, this embodiment provides a gas drag reduction jetting device 100, which is applicable to any ship type with a flat bottom, including but not limited to liquefied gas carriers, container ships, bulk carriers, etc. The gas drag reduction jetting device 100 includes a gas supply assembly, a guide pipe 1, and a guide cover 2. One end of the guide pipe 1 is connected to the gas supply assembly, and the other end of the guide pipe 1 is configured to communicate with a through hole 1001 on the bottom plate 1000. The guide cover 2 is configured to cover the through hole 1001 from the side of the bottom plate 1000 away from the guide pipe 1, so that the guide cover 2 and the bottom plate 1000 form a narrow slit, which is used for gas ejection and for the gas to flow along the bottom plate 1000.

[0039] The bottom plate 1000 is located below the guide pipe 1, providing support for the guide pipe 1 and also providing an outlet boundary for the gas to exit the hull. The bottom plate 1000 has through holes 1001 at the point where it receives the guide pipe 1. The outline of the through holes 1001 coincides with the inner outline of the port of the guide pipe 1 at the contact end, and the number of through holes 1001 is the same as the number of guide pipes 1. The inner side of the bottom plate 1000 is the hull, and the outer side is the outer surface of the ship. The gas supply assembly and the guide pipe 1 are both located on the inner side of the bottom plate 1000, while the guide cover 2 is located on the outer side. The guide pipe 1 and the guide cover 2 are connected through the through holes 1001.

[0040] When the gas drag reduction jet device 100 is working, the gas supply component supplies gas to the guide pipe 1. The gas is ejected from the through hole 1001 of the bottom plate 1000 through the guide pipe 1. At this time, the gas is ejected along the narrow slit under the guiding action of the guide cover 2 and flows along the bottom plate 1000.

[0041] When installing this device on a ship, only a small through hole 1001 needs to be made in the bottom plate 1000. Therefore, the device occupies a small area of ​​the bottom plate 1000, has little impact on the ship's structural construction, and is easy to install. Furthermore, most of the device's structure is located inside the hull, with only minor structures protruding from the hull, resulting in minimal additional drag on the ship. Under the action of the flow guide 2, the gas can be ejected completely close to the plate, thus increasing the gas coverage efficiency on the hull surface and resulting in a higher drag reduction rate per unit volume of gas.

[0042] As shown in Figures 1 and 2, in this embodiment, the gas supply assembly includes an air inlet pipe 3, an air chamber 4, and a bubble generator. The air chamber 4 is provided with an air inlet 41, an air outlet 42, and an internal air chamber that communicates with the air inlet 41 and the air outlet 42. The bubble generator is located in the air chamber and separates the air inlet 41 and the air outlet 42. The air inlet pipe 3 is connected to the air inlet 41. The number of guide pipes 1 and the number of air outlets 42 are equal and they are connected in a one-to-one correspondence.

[0043] The intake pipe 3 is an annular pipe. One end (upper port) of the intake pipe 3 connects to the end of the gas distribution pipe 300, and its size can be adjusted according to the size of the end of the gas distribution pipe 300 to facilitate connection between the device and the gas distribution pipe 300. The other end (lower port) of the intake pipe 3 connects to the gas chamber 4 to deliver gas to the gas chamber 4. Generally, the upper port of the intake pipe 3 is circular, and the lower port is a shape that is symmetrical about the center, including but not limited to a circle. In this embodiment, both the upper and lower ports of the intake pipe 3 are circular. The diameter of the upper port is the same as the diameter of the end of the gas distribution pipe 300, and the inner diameter of the lower port is the same as the inner diameter of the air inlet 41 of the gas chamber 4.

[0044] The air chamber 4 is a box-shaped structure, with the internal space of the box being an air chamber. In this embodiment, the air chamber 4 is cylindrical, and the air chamber is also cylindrical. The air inlet 41 is also cylindrical, located at the top of the air chamber 4, with its center line coinciding with the center line of the air chamber 4. The air inlet 41 is connected to the lower end of the air inlet pipe 3. The air outlet 42 is located on the side of the air chamber 4, and there is at least one air outlet 42 on the air chamber 4. In this embodiment, there are three air outlets 42 on the side of the air chamber 4, and the size of the air outlets 42 is inversely proportional to the number of air outlets 42.

[0045] As shown in Figures 1 and 3, the bubble generator is located in the air chamber. Compressed gas enters the air chamber through the inlet pipe 3 and the inlet hole 41 of the air room 4, where it is transformed into microbubbles by the bubble generator. In this embodiment, the bubble generator includes an inner tube 5 and an outer tube 6. Both the inner tube 5 and the outer tube 6 have multiple arrayed through holes. The diameter of the air chamber is larger than the outer diameter of the outer tube 6, and the inner diameter of the inner tube 5 is larger than the maximum diameter of the inlet hole 41. The inner tube 5 is located inside the outer tube 6, and the upper and lower ends of the inner tube 5 and the outer tube 6 are connected to the air chamber. The sidewalls of the inner tube 5 and the outer tube 6 do not interfere with each other, and the central axis of the two tubes coincides with the central axis of the air room 4. The inner tube 5 and the outer tube 6 divide the air room 4 into multiple regions. The inlet hole 41 is located in the region between the inner tube 5 and the air room 4, and the outlet hole 42 is located in the region between the outer tube 6 and the air room 4.

[0046] As shown in Figure 1, to ensure the stability of the air chamber 4 under different ship operating conditions, the air supply assembly also includes a base 7. The base 7 is configured to be mounted on the bottom plate 1000 of the ship, and the air chamber 4 is located above the base 7. The base 7 is a cruciform trapezoid, meaning that the top and bottom sections of the base 7 are cruciform and symmetrical about the center point. The maximum length of the top of the base 7 is equal to the maximum outer dimension of the air chamber 4, and the maximum length of the bottom of the base 7 is greater than the maximum length of the top.

[0047] As shown in Figures 1, 4, and 5, there is at least one flow guide pipe 1 connected to the air supply assembly. There is also at least one flow guide cover 2, with the number of flow guide pipes 1 and flow guide covers 2 being equal and corresponding one-to-one. In this embodiment, there are three flow guide pipes 1 and three flow guide covers 2. The bottom plate 1000 has three through holes 1001. One end of each of the three flow guide pipes 1 is connected to the air chamber 4 via a corresponding air outlet 42, and the other end of each flow guide pipe 1 is connected to a corresponding through hole 1001. The three flow guide covers 2 are located on the side of the bottom plate 1000 opposite to the flow guide pipes 1 and correspond one-to-one with each of the three through holes 1001.

[0048] The cross-sectional area of ​​the guide pipe 1 along the vertical direction gradually increases from the end near the air supply component to the end of the guide cover 2. In this embodiment, the guide pipe 1 is shaped like a truncated triangular prism (Figure 6). The truncated triangular prism is obtained by subtracting a smaller tetrahedron from a larger tetrahedron, that is, the remaining part after subtracting tetrahedron oABC from tetrahedron oA'B'C'. The included angle between the projections of the side of the guide pipe 1 onto the bottom plate 1000 is 15°, and the specific angle can be determined according to the ship type. The end of the guide pipe 1 connected to the air chamber 4 is the narrow end, and the end of the guide pipe 1 connected to the bottom plate 1000 is the wide end. Gas enters from the narrower end and exits from the wider end, transferring the gas from the air chamber 4 to different points on the bottom plate 1000.

[0049] The guide pipe 1 is configured to form a preset angle with the bottom plate 1000. In this embodiment, the angle between each guide pipe 1 and the bottom plate 1000 is 4.5° (Figure 5). In different ship types, the angle between the guide pipe 1 and the bottom plate 1000 can be adjusted as needed.

[0050] Multiple guide pipes 1 are arranged at intervals around the air supply component. There is a preset angle between two adjacent guide pipes 1. Specifically, the angle between the projections of the two closest sides of adjacent guide pipes 1 onto the bottom plate 1000 is 15°. The specific angle can be determined according to the ship type.

[0051] By arranging and combining the variables of the above-mentioned angles, various jet adjustment methods can be obtained, giving the jet device extremely high flexibility and adaptability. When facing complex installation environments composed of different ship types and different areas, the jet device can be adjusted by changing at least one of the following four methods: the number of guide pipes, the angle between two adjacent guide pipes, the angle between the guide pipe and the bottom plate 1000, and the angle between the two sides of the guide pipe. The jet device can achieve a harmonious integration with the hull by flexibly selecting and adjusting these variables, minimizing or eliminating the impact on the original hull structure design.

[0052] As shown in Figures 1 and 7, the guide cover 2 has a groove 21 on the side facing the guide tube 1. The guide cover 2 is configured to cover the through hole 1001 from the side of the bottom plate 1000 away from the guide tube 1, so that the guide cover 2 and the bottom plate 1000 form a narrow slit. The guide cover 2 is used to adjust the direction of gas injection and make the gas ejection more concentrated.

[0053] As shown in Figure 8, the groove 21 of the flow guide cover 2 is an isosceles trapezoid. The groove wall 22 of the groove 21 is perpendicular to the bottom plate 1000, and the bottom 23 is an isosceles trapezoid and parallel to the bottom plate 1000. It can be understood that the through hole 1001 is an isosceles trapezoid. The top edge of the trapezoidal profile of the groove 21 is equal to and collinear with the top edge of the trapezoidal profile of the through hole 1001. The two sides of the trapezoidal profile of the groove 21 are collinear with the two sides of the trapezoidal profile of the through hole 1001, but the length of the two sides of the trapezoidal profile of the groove 21 is greater than the length of the two sides of the trapezoidal profile of the through hole 1001. Therefore, after the flow guide cover 2 is installed, a narrow slit will be formed (as shown in Figure 7, where the dashed line represents the flow guide cover 2 and the solid line represents the through hole 1001). Gas enters the groove 21 of the guide cover 2 through the through hole 1001, and after being rectified by the groove 21, it adheres closely to the bottom plate 1000 and is ejected parallel to the bottom plate 1000, thereby forming a drag-reducing gas layer.

[0054] In this embodiment, the side of the flow guide cover 2 facing away from the flow guide tube 1 is a quarter-ellipsoidal surface. This arrangement helps to reduce drag.

[0055] As shown in Figures 9 to 11, this embodiment also discloses a ship, which includes a bottom plate 1000, the aforementioned gas drag reduction jet device 100, a gas supply system 200, a gas distribution pipeline 300 that can distribute gas from the source to each jet device, and a control system 400 that controls the operating status of the device. The gas drag reduction jet device 100 is disposed on the bottom plate 1000, and the number of gas drag reduction jet devices 100 is at least one set. Multiple sets of gas drag reduction jet devices 100 are disposed on the upstream end of the inner side of the bottom plate 1000. The number of gas drag reduction jet devices in each set is at least one. When the number of gas drag reduction jet devices is one, the gas drag reduction jet device is disposed on the longitudinal section line of the bottom plate 1000. When the number of gas drag reduction jet devices is multiple, the multiple gas drag reduction jet devices 100 are symmetrically arranged about the longitudinal section line of the bottom plate 1000. The bottom plate 1000 is divided into a bow end and a stern end, with the bow end facing the flow. The mid-longitudinal section line is the centerline of the bottom plate 1000 extending along the length of the ship. Understandably, the distances between adjacent gas drag reduction jet devices 100 must ensure that they do not interfere with each other during installation.

[0056] Multiple gas drag reduction jet devices 100 located at the same longitudinal position form a group. These groups of gas drag reduction jet devices 100 are sequentially divided into a first group, a second group, a third group, a fourth group, a fifth group, and a sixth group, extending along the mid-longitudinal section line from the bow to the stern of the bottom plate 1000. It should be noted that the number of groups of gas drag reduction jet devices 100 is determined according to the actual situation, and the multiple gas drag reduction jet devices 100 in each group are symmetrically arranged about the mid-longitudinal section line. In this embodiment, two implementation methods for the arrangement of multiple gas drag reduction jet devices 100 are provided.

[0057] First Embodiment

[0058] For example, there are six groups of gas drag reduction jet devices 100. Due to the ship's structural limitations, gas drag reduction jet devices 100 cannot be installed at the mid-longitudinal section line. In this case, the first, second, fifth, and sixth groups each have two gas drag reduction jet devices 100, while the third and fourth groups each have four. The third and fourth groups are reinforcement groups; increasing the number of gas drag reduction jet devices in the third and fourth groups increases the gas coverage. Two gas drag reduction jet devices 100 in the first, second, fifth, and sixth groups are located at the edge of the bottom plate 1000, and the distance from the edge should be greater than 0. In the third and fourth groups, the two outer gas drag reduction jet devices 100 are located at the edge of the bottom plate 1000, and the distance from the edge should be greater than 0. The two middle gas drag reduction jet devices 100 are located close to the mid-longitudinal section line, and the distance from the mid-longitudinal section line should be greater than 0. Furthermore, the distance between the two gas drag-reducing jet devices 100 in the fourth group that are closest to the center longitudinal section is greater than the distance between the two gas drag-reducing jet devices 100 in the third group that are also closest to the center longitudinal section. This arrangement ensures that after the gas is ejected from the hull, it can cover the hull as much as possible as possible after being carried by the surrounding water flow, thereby increasing the gas coverage around the hull and improving the drag reduction effect.

[0059] Second Embodiment

[0060] For example, there are six groups of gas drag reduction jet devices 100. Due to the structural reasons of the ship, gas drag reduction jet devices 100 can be installed at the mid-longitudinal section line. In this case, the first group has one gas drag reduction jet device 100, the fourth and fifth groups have four gas drag reduction jet devices 100, the fourth and fifth groups are reinforced groups, and the remaining groups each have two gas drag reduction jet devices 100. The gas drag reduction jet devices 100 in the first group are located on the mid-longitudinal section line and close to the bow end of the bottom plate 1000. The two gas drag reduction jet devices 100 in the second, third, and sixth groups are located at the edge of the bottom plate 1000, and the distance from the edge should be greater than 0. The two outer gas drag reduction jet devices 100 in the fourth and fifth groups are located at the edge of the bottom plate 1000, and the distance from the edge should be greater than 0. The two middle gas drag reduction jet devices 100 are located close to the mid-longitudinal section line, and the distance from the mid-longitudinal section line should be greater than 0. Furthermore, the distance between the two gas drag-reducing jet devices 100 in the fifth group that are closest to the mid-longitudinal section line is greater than the distance between the two gas drag-reducing jet devices 100 in the fourth group that are closest to the mid-longitudinal section line. This arrangement ensures that after the gas is ejected from the hull, it can cover a larger area of ​​the hull as it develops with the surrounding water flow, thereby increasing the gas coverage around the hull and improving the drag reduction effect.

[0061] The gas drag reduction jet device 100 of this embodiment has strong adaptability. By designing the angle and number of the guide pipes 1, it can be applied to any ship type without affecting the original hull structure layout. In addition, the gas drag reduction jet device 100 of this embodiment only needs to have an opening at the contact point between the end of the guide pipe 1 and the bottom plate 1000, which has minimal impact on the hull structure.

[0062] In this embodiment, the guide cover 2 allows the gas to be ejected completely close to the bottom plate 1000 of the ship, which can make the gas coverage efficiency on the surface of the ship higher, thereby resulting in a higher drag reduction rate per unit volume of gas.

[0063] In this embodiment, the portion protruding from the hull is small, resulting in less additional drag. The protruding design of the guide cover 2 in this embodiment allows for a more flexible arrangement area and more diverse injection angles. For example, to generate an air layer covering the width of the ship, this embodiment only needs to design a reasonable number of guide pipes 1 and injection direction, and arrange several jet devices in the projection direction of the ship's width to achieve air layer coverage across the entire width of the ship.

[0064] The arrangement provided in this embodiment, combined with the gas drag reduction jet device 100 provided in this embodiment, can achieve full width coverage of the air layer without the projection of the gas drag reduction jet device 100 in the width direction of the ship.

[0065] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A gas drag reduction jetting device, characterized in that, include: Gas supply components; A flow guide pipe, one end of which is connected to the air supply assembly, and the other end of which is configured to communicate with a through hole on the bottom plate of the ship; A flow guide cover is configured to cover the through hole from the side of the bottom plate away from the flow guide tube, so that the flow guide cover and the bottom plate form a narrow slit for gas to be ejected and for the gas to flow along the bottom plate.

2. The gas drag reduction jetting device according to claim 1, characterized in that: There are multiple flow guides, each of which is connected to the gas supply assembly. There are also multiple flow guide covers, each corresponding to one of the multiple flow guides.

3. The gas drag reduction jetting device according to claim 2, characterized in that: The multiple guide pipes are arranged at intervals around the air supply assembly, and there is a preset angle between two adjacent guide pipes.

4. The gas drag reduction jetting device according to claim 1, characterized in that: The cross-sectional area of ​​the flow guide tube gradually increases from one end near the air supply assembly to one end of the flow guide cover.

5. The gas drag reduction jetting device according to claim 4, characterized in that: The guide tube is shaped like a truncated triangular prism.

6. The gas drag reduction jetting device according to claim 1, characterized in that: The flow guide is configured to form a preset angle with the bottom plate of the ship.

7. The gas drag reduction jetting device according to claim 1, characterized in that: The side of the flow guide cover opposite to the flow guide tube is a quarter-ellipsoid.

8. The gas drag reduction jetting device according to claim 1, characterized in that: The flow guide cap has a groove on the side facing the flow guide tube, and the groove is used to form the narrow slit when the flow guide cap is placed over the through hole.

9. The gas drag reduction jetting device according to claim 1, characterized in that: The gas supply assembly includes an air inlet pipe, an air chamber, and a bubble generator. The air chamber has an air inlet, an air outlet, and an internal air chamber that communicates with the air inlet and the air outlet. The bubble generator is located in the air chamber and is separated from the air inlet and the air outlet. The air inlet pipe communicates with the air inlet. The number of guide pipes and the number of air outlets are equal and they are connected in a one-to-one correspondence.

10. The gas drag reduction jetting device according to claim 9, characterized in that: The size of the air outlet is inversely proportional to the number of air outlets.

11. The gas drag reduction jetting device according to claim 9, characterized in that: The bubble generator includes an inner tube and an outer tube. The inner tube is located inside the outer tube and the two are spaced apart. The inner tube and the outer tube divide the air chamber into multiple regions. The air inlet is located in the region between the inner tube and the air chamber, and the air outlet is located in the region between the outer tube and the air chamber. Both the inner tube and the outer tube have multiple arrayed through holes.

12. The gas drag reduction jetting device according to claim 9, characterized in that: The air supply assembly also includes a base configured to be mounted on a flat plate at the bottom of the ship, with the air chamber located above the base.

13. The gas drag reduction jetting device according to claim 12, characterized in that: The base is a cross-shaped trapezoid, the maximum length of the top of the base is equal to the maximum dimension of the outer contour of the air chamber, and the maximum length of the bottom of the base is greater than the maximum length of the top.

14. A ship, characterized in that: Includes a flat bottom plate and a gas drag reduction jet device as described in any one of claims 1-13 disposed on the flat bottom plate.

15. A jet adjustment method for a gas drag reduction jet device as described in any one of claims 1-13, characterized in that: Based on the ship's hull type, adjustments can be made by at least one of four methods: changing the number of guide pipes, the angle between two adjacent guide pipes, the angle between the guide pipe and the ship's bottom plate, and the angle between the two sides of the guide pipe.

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