Gas drag reduction injection device and ship

Abstract

The application provides a gas resistance-reducing air injection device and a ship, which comprises a gas supply assembly, a flow guide pipe, one end of the flow guide pipe being connected with the gas supply assembly, the other end of the flow guide pipe being configured to communicate with a through hole on a ship bottom plate, and a flow guide cover, the flow guide cover being configured to cover the through hole from the side of the ship bottom plate away from the flow guide pipe, so that the flow guide cover and the ship bottom plate form a narrow gap, and the narrow gap is used for gas injection and gas flow along the ship bottom plate. The gas resistance-reducing air injection device occupies a smaller area of the ship bottom plate, is easy to arrange, and can reduce the adverse effects of the gas resistance-reducing air injection device on the performance and structure of the ship body.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ship energy saving, and in particular to a gas drag reduction jet device and a ship. BACKGROUND

[0002] The gas drag reduction ship refers to a ship equipped with a gas drag reduction technology. The gas lubrication technology is to inject gas between the ship body and seawater to form a gas layer, so as to reduce the frictional resistance between the ship body and water, thereby improving the running efficiency of the ship and reducing fuel consumption. The gas drag reduction jet device as the core device of the gas lubrication technology, its structure form and arrangement scheme have a significant influence on the final drag reduction and energy saving effect of the gas lubrication technology.

[0003] Although different technical routes of the gas lubrication technology have been disclosed, there is still room for optimization of the adverse effects of the installation of the gas drag reduction jet device on the performance and structure of the ship body. SUMMARY

[0004] In view of the above-mentioned shortcomings of the related art, the purpose of the present application is to provide a gas drag reduction jet device and a ship, which is used to reduce the adverse effects of the gas drag reduction jet device itself on the performance and structure of the ship body.

[0005] To achieve the above-mentioned purposes and other related purposes, the present application provides a gas drag reduction jet device, comprising a gas supply assembly; a flow guide pipe, one end of the flow guide pipe being connected with the gas supply assembly, the other end of the flow guide pipe being configured to communicate with a through hole on a ship bottom plate; and a flow guide cover, the flow guide cover being configured to be arranged on the through hole from the side of the ship bottom plate away from the flow guide pipe, so that the flow guide cover and the ship bottom plate form a narrow gap, and the narrow gap is used for gas ejection and gas flow along the ship bottom plate.

[0006] Optionally, the number of the flow guide pipes is multiple, the multiple flow guide pipes are all connected with the gas supply assembly, and the number of the flow guide covers is multiple, the multiple flow guide covers correspond to the multiple flow guide pipes one by one.

[0007] Optionally, the multiple flow guide pipes are arranged at intervals around the gas supply assembly, and the angle between adjacent two flow guide pipes is a preset angle.

[0008] Optionally, the cross-sectional area of the flow guide pipe in the vertical direction gradually increases from one end close to the gas supply assembly to the other end close to the flow guide cover.

[0009] Optionally, the flow guide pipe is in the shape of a three-prism platform.

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

[0011] Optionally, the side of the flow guide cover away from the flow guide pipe is a quarter ellipsoidal surface.

[0012] Optionally, the side of the flow guide cover facing the flow guide pipe is provided with a groove, and the groove is used to form the narrow gap when the flow guide cover is placed on the through hole.

[0013] Optionally, the air supply assembly comprises an air inlet pipe, an air chamber and a bubble generator, the air chamber is provided with an air inlet hole, an air outlet hole and an air chamber inside which communicates with the air inlet hole and the air outlet hole, the bubble generator is arranged in the air chamber and separates the air inlet hole and the air outlet hole, the air inlet pipe communicates with the air inlet hole, and the number of the flow guide pipes is equal to the number of the air outlet holes and communicates one by one.

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

[0015] Optionally, the bubble generator comprises an inner tube and an outer tube, the inner tube is located inside the outer tube and is spaced apart, the inner tube and the outer tube separate the air chamber into multiple areas, the air inlet hole is located in the area between the inner tube and the air chamber, the air outlet hole is located in the area between the outer tube and the air chamber, and a plurality of arrayed through holes are arranged on the inner tube and the outer tube.

[0016] Optionally, the air supply assembly further comprises a base, the base is configured to be arranged on the bottom plate, and the air chamber is arranged above the base.

[0017] Optionally, the base is a cross-shaped ladder, the maximum length of the top of the base is equal to the maximum size 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 ship comprising a bottom plate and a gas drag reduction air jet device as described above arranged on the bottom plate.

[0019] An air jet adjustment method for the gas drag reduction air jet device as described above, based on the ship type of the ship, at least one of the following four ways is adjusted: changing the number of flow guide pipes, the included angle between adjacent two flow guide pipes in the plurality of flow guide pipes, the included angle between the flow guide pipe and the bottom plate, and the included angle between the two sides of the flow guide pipe.

[0020] As mentioned above, the gas drag reduction device and the ship of the present application have the following advantages: when the device is arranged on the ship, only a small-size through hole is needed to be opened on the ship bottom plate, so the device occupies a smaller area of the ship bottom plate, has a smaller influence on the structure of the ship body, and is easy to arrange. In addition, most of the structure of the device is arranged in the ship cabin, only a small structure protrudes from the ship body, and the additional drag caused by the device to the ship is small. Under the action of the flow guide cover, the gas can be completely sprayed close to the plate, so that the coverage efficiency of the gas on the surface of the ship body is higher, thereby bringing a higher drag reduction rate of unit volume of gas. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 An exploded schematic view of the gas drag reduction device in the embodiment of the present application is shown.

[0022] Figure 2 A schematic view of the gas chamber in the embodiment of the present application is shown.

[0023] Figure 3 A schematic view of the bubble generator in the embodiment of the present application is shown.

[0024] Figure 4 A top view schematic view of the plurality of flow guide pipes in the embodiment of the present application is shown.

[0025] Figure 5 A side view schematic view of the flow guide pipe in the embodiment of the present application is shown.

[0026] Figure 6 A shape schematic view of the flow guide pipe in the embodiment of the present application is shown.

[0027] Figure 7 A state schematic view of the flow guide cover arranged on the through hole in the embodiment of the present application is shown.

[0028] Figure 8 A schematic view of the flow guide cover in the embodiment of the present application is shown.

[0029] Figure 9 A schematic view of the ship containing the gas drag reduction device in the embodiment of the present application is shown.

[0030] Figure 10 A schematic view of the first embodiment of the arrangement mode of the gas drag reduction device in the embodiment of the present application is shown.

[0031] Figure 11 A schematic view of the second embodiment of the arrangement mode of the gas drag reduction device in the embodiment of the present application is shown.

[0032] ELEMENT NUMBER EXPLANATION

[0033] 1000, bottom plate; 1001, through hole; 100, gas drag reduction device; 1, flow guide pipe; 2, flow guide cover; 21, groove; 22, groove wall; 23, groove bottom; 3, gas inlet pipe; 4, gas chamber; 41, gas inlet hole; 42, gas outlet hole; 5, inner pipe; 6, outer pipe; 7, base; 200, gas supply system; 300, gas distribution pipeline; 400, control system. DETAILED DESCRIPTION

[0034] The present application is herein described, by way of example only, with the assistance of the accompanying drawings detailed description. As the description of the application is only an example, those skilled in the art can easily understand other advantages and effects of the present application from the disclosure herein. The present application can also be implemented or applied in other different embodiments, and the details in the description can be modified or changed based on different views and applications without departing from the spirit of the present application.

[0035] As described in the detailed description of the embodiments of the present application, the cross-sectional view of the device structure is partially enlarged without the general proportion for the convenience of description, and the schematic diagram is only an example which should not limit the scope of protection of the present application herein. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual manufacture.

[0036] For the convenience of description, spatial relationship words such as "under", "below", "lower", "under", "above", "upper" and the like can be used herein to describe the relationship of one element or feature with other elements or features shown in the drawings. It will be understood that these spatial relationship words are intended to include other directions of the device in use or operation in addition to the directions depicted in the drawings. In addition, when a layer is referred to as "between" two layers, it can be the only layer between the two layers, or one or more intervening layers can also be present. "Between" is used herein to include both end point values.

[0037] In the context of the present application, the structure described as the first feature "above" the second feature can include the embodiment in which the first and second features are formed in direct contact, and can also include the embodiment in which another feature is formed between the first and second features, so that the first and second features can not be in direct contact.

[0038] It should be noted that the diagrams provided in the embodiments herein only schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the diagrams, not the number, shape and size of the components when actually implemented. The actual implementation of each component can be a random change, and the component layout pattern can be more complex.

[0039] As Figure 1As shown, the embodiment provides a gas drag reduction device 100, which is suitable for any ship type with flat bottom, including but not limited to liquefied gas carrier, container ship, bulk carrier, etc. The gas drag reduction device 100 comprises a gas supply assembly, a flow guide pipe 1 and a flow guide cover 2. One end of the flow guide pipe 1 is connected with the gas supply assembly, and the other end of the flow guide pipe 1 is configured to communicate with the through holes 1001 on the ship bottom plate 1000; the flow guide cover 2 is configured to cover the through holes 1001 from the side of the ship bottom plate 1000 away from the flow guide pipe 1, so that the flow guide cover 2 forms a narrow gap with the ship bottom plate 1000, and the narrow gap is used for gas ejection and gas flow along the ship bottom plate 1000.

[0040] The ship bottom plate 1000 is located below the flow guide pipe 1, providing support for the flow guide pipe 1 and an outlet boundary for gas ejection from the ship body. The ship bottom plate 1000 is provided with through holes 1001 at the position where the flow guide pipe 1 is received, and the profile of the through holes 1001 coincides with the inner profile of the port of the contact end of the flow guide pipe 1, and the number of the through holes 1001 is the same as that of the flow guide pipe 1. The inner side of the ship bottom plate 1000 is the ship cabin, and the outer side of the ship bottom plate 1000 is the outer surface of the ship, the gas supply assembly and the flow guide pipe 1 are arranged on the inner side of the ship bottom plate 1000, and the flow guide cover 2 is arranged on the outer side of the ship bottom plate 1000, and the flow guide pipe 1 and the flow guide cover 2 are communicated through the through holes 1001.

[0041] When the gas drag reduction device 100 works, the gas supply assembly supplies gas to the flow guide pipe 1, and the gas is ejected from the through holes 1001 of the ship bottom plate 1000 through the flow guide pipe 1, at this time, the gas is ejected along the narrow gap and flows along the ship bottom plate 1000 under the flow guiding effect of the flow guide cover 2.

[0042] When the device is arranged on the ship, only small size through holes 1001 need to be opened on the ship bottom plate 1000, so the device occupies a small area of the ship bottom plate 1000, has a small influence on the structure of the ship body, and is easy to arrange. In addition, most of the structure of the device is arranged in the ship cabin, only a small structure protrudes from the ship body, and the device causes small additional resistance to the ship. Under the action of the flow guide cover 2, the gas can be ejected completely close to the plate, which can make the coverage efficiency of the gas on the surface of the ship body higher, thereby bringing higher drag reduction rate per unit volume of gas.

[0043] As shown in Figure 1 and Figure 2 In this embodiment, the gas supply assembly comprises an air inlet pipe 3, a gas chamber 4 and a bubble generator, the gas chamber 4 is provided with an air inlet hole 41, an air outlet hole 42 and an air chamber inside which communicates with the air inlet hole 41 and the air outlet hole 42, the bubble generator is arranged in the air chamber and separates the air inlet hole 41 and the air outlet hole 42, the air inlet pipe 3 communicates with the air inlet hole 41, and the flow guide pipe 1 communicates with the air outlet hole 42 in a one-to-one correspondence.

[0044] The inlet pipe 3 is a ring pipe, one end (upper port) of the inlet pipe 3 is connected to the end of the gas distribution pipe 300, and the size can be adjusted according to the size of the end of the gas distribution pipe 300, so as to facilitate the connection of the device with the gas distribution pipe 300, the other end (lower port) of the inlet pipe 3 is connected to the gas chamber 4, so as to deliver the gas to the gas chamber 4. Generally, the upper port of the inlet pipe 3 is circular, and the lower port is a shape symmetrical about the center, including but not limited to circular. In this embodiment, the upper port and the lower port of the inlet pipe 3 are both circular, the diameter of the upper port is the same as the pipe diameter of the end of the gas distribution pipe 300, and the inner diameter of the lower port is the same as the inner hole diameter of the gas inlet hole 41 of the gas chamber 4.

[0045] The gas chamber 4 is a box body, and the internal space of the box body is a gas chamber. In this embodiment, the gas chamber 4 is a cylinder, and the gas chamber is also a cylinder. The gas inlet hole 41 is also a cylinder, the gas inlet hole 41 is located at the top of the gas chamber 4, the center line of the gas inlet hole 41 coincides with the center line of the gas chamber 4, and the gas inlet hole 41 is connected to the lower port of the inlet pipe 3. The gas outlet hole 42 is located on the side of the gas chamber 4, and there is at least one gas outlet hole 42 on the gas chamber 4. In this embodiment, there are three gas outlet holes 42 on the side of the gas chamber 4, and the size of the gas outlet hole 42 is inversely proportional to the number of the gas outlet hole 42.

[0046] As shown in Figure 1 and Figure 3 , the bubble generator is located in the gas chamber. The compressed gas enters the gas chamber through the gas inlet hole 41 of the gas chamber 4 via the inlet pipe 3, and becomes micro-bubbles after the action of the bubble generator. In this embodiment, the bubble generator includes an inner pipe 5 and an outer pipe 6, a plurality of arrayed through holes are formed on the inner pipe 5 and the outer pipe 6, the diameter of the gas chamber is greater than the outer diameter of the outer pipe 6, the inner diameter of the inner pipe 5 is greater than the maximum hole diameter of the gas inlet hole 41, the inner pipe 5 is located in the inner part of the outer pipe 6, the upper and lower ends of the inner pipe 5 and the outer pipe 6 are connected with the gas chamber, the side wall of the inner pipe 5 and the outer pipe 6 does not interfere with the side wall of the gas chamber, and the center axes of the two circular pipes coincide with the center axis of the gas chamber 4. The inner pipe 5 and the outer pipe 6 divide the gas chamber 4 into multiple areas, the gas inlet hole 41 is located in the area between the inner pipe 5 and the gas chamber 4, and the gas outlet hole 42 is located in the area between the outer pipe 6 and the gas chamber 4.

[0047] As shown in Figure 1 , in order to ensure that the gas chamber 4 can be stable under different ship operating conditions, the gas supply assembly further includes a base 7, the base 7 is configured to be arranged on the ship bottom plate 1000, and the gas chamber 4 is arranged above the base 7. The base 7 is a cross-shaped ladder, that is, the top and bottom sections of the base 7 are cross-shaped and symmetrical about the center point. The maximum length of the top of the base 7 is equal to the maximum size of the outer contour of the gas chamber 4, and the maximum length of the bottom of the base 7 is greater than the maximum length of the top.

[0048] As shown in Figure 1 , Figure 4 and Figure 5As shown, the number of flow guide pipes 1 is at least one, the flow guide pipes 1 are connected with the air supply assembly, the number of flow guide covers 2 is at least one, and the number of flow guide pipes 1 is equal to and corresponds to the number of flow guide covers 2. In the embodiment, the number of flow guide pipes 1 and flow guide covers 2 is three, the number of through holes 1001 of the bottom plate 1000 is three, one end of the three flow guide pipes 1 is connected with the air chamber 4 through the corresponding air outlet hole 42, the other end of the three flow guide pipes 1 is connected with the corresponding through hole 1001, and the three flow guide covers 2 are arranged on the side of the bottom plate 1000 away from the flow guide pipes 1 and correspond to the three through holes 1001 respectively.

[0049] The cross-sectional area of the flow guide pipe 1 in the vertical direction gradually increases from one end close to the air supply assembly to the other end close to the flow guide cover 2. In the embodiment, the flow guide pipe 1 is a triangular frustum shape Figure 6 The projection of the side of the flow guide pipe 1 on the bottom plate 1000 has an angle of 15°. The specific angle can be determined according to the ship type. One end of the flow guide pipe 1 connected with the air chamber 4 is a narrow end, and the other end of the flow guide pipe 1 connected with the bottom plate 1000 is a wide end. The gas enters from the narrower end and exits from the wider end, and is transmitted from the air chamber 4 to different points on the bottom plate 1000.

[0050] The flow guide pipe 1 is configured to have a preset angle with the bottom plate 1000. In the embodiment, the angle between each flow guide pipe 1 and the bottom plate 1000 is 4.5° Figure 5 In different ship types, the angle between the flow guide pipe 1 and the bottom plate 1000 can be adjusted as needed.

[0051] The plurality of flow guide pipes 1 are arranged at intervals around the air supply assembly, and adjacent two flow guide pipes 1 have a preset angle. Specifically, the projection of the two closest sides of adjacent flow guide pipes 1 on the bottom plate 1000 has an angle of 15°. The specific angle can be determined according to the ship type.

[0052] By arranging and combining the above-mentioned several angles, a plurality of jet adjustment methods of jet modes can be obtained. This feature makes the jet device have strong flexibility and adaptability. When facing complex installation environments composed of different ship types, different regions, etc., at least one of the following four ways can be adjusted: the number of flow guide pipes, the angle between adjacent two flow guide pipes in the plurality of flow guide pipes, the angle between the flow guide pipe and the bottom plate 1000, and the angle between the two sides of the flow guide pipe. The jet device can be flexibly selected and adjusted to make it compatible with the ship body as much as possible, and to minimize or not affect the original ship structure design.

[0053] For example, Figure 1 andFigure 7 As shown, 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.

[0054] like Figure 8 As shown, 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 (e.g., ...). Figure 7 As shown in the figure, the dashed line represents the flow guide cover 2, and the solid line represents the through hole 1001. The gas enters the groove 21 of the flow guide cover 2 through the through hole 1001, and after being rectified by the groove 21, it adheres tightly to the bottom plate 1000 of the ship and is ejected parallel to the bottom plate 1000, thereby forming a drag-reducing gas layer.

[0055] 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.

[0056] like Figure 9 to Figure 11 As shown, 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.

[0057] The plurality of gas drag reduction jet devices 100 in the same longitudinal position form a group, and the plurality of 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 along the direction of extension of the centerline from the bow end to the stern end of the ship 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 plurality of gas drag reduction jet devices 100 in each group are symmetrically arranged about the centerline. In this embodiment, two embodiments are provided for the arrangement mode of the plurality of gas drag reduction jet devices 100.

[0058] First embodiment

[0059] For example, there are six groups of gas drag reduction jet devices 100, and due to the structure of the ship, the gas drag reduction jet devices 100 cannot be arranged at the position of the centerline. At this time, the number of gas drag reduction jet devices 100 in the first group, the second group, the fifth group and the sixth group is two, and the number of gas drag reduction jet devices 100 in the third group and the fourth group is four. The third group and the fourth group are the reinforcement group, and the number of gas drag reduction jet devices in the third group and the fourth group is increased to increase the gas coverage. The two gas drag reduction jet devices 100 in the first group, the second group, the fifth group and the sixth group are arranged at the edge position of the ship bottom plate 1000, and the distance from the edge should be greater than 0. The two gas drag reduction jet devices 100 on the outside in the third group and the fourth group are arranged at the edge position of the ship bottom plate 1000 and the distance from the edge should be greater than 0, and the two gas drag reduction jet devices 100 in the middle are arranged close to the centerline and the distance from the centerline should be greater than 0. In addition, the distance between the two gas drag reduction jet devices 100 close to the centerline in the fourth group is greater than the distance between the two gas drag reduction jet devices 100 close to the centerline in the third group. By such arrangement, it can be ensured that after the gas is ejected from the ship body, the gas can cover the ship body as much as possible after the development of the water flow around the ship body, thereby improving the coverage of the gas around the ship body and improving the drag reduction effect.

[0060] Second embodiment

[0061] For example, the gas drag reduction device 100 has six groups in total, and due to the structure of the ship, the gas drag reduction device 100 can be arranged at the position of the centerline, at this time, the first group has one gas drag reduction device 100, the fourth group and the fifth group have four gas drag reduction devices 100, the fourth group and the fifth group are reinforced groups, and the remaining groups each have two gas drag reduction devices 100. The gas drag reduction device 100 of the first group is located on the centerline and close to the bow end of the ship bottom plate 1000, two gas drag reduction devices 100 in the second group, the third group and the sixth group are arranged at the edge position of the ship bottom plate 1000, and the distance from the edge should be greater than 0. The two gas drag reduction devices 100 on the outside in the fourth group and the fifth group are arranged at the edge position of the ship bottom plate 1000 and the distance from the edge should be greater than 0, and the two gas drag reduction devices 100 in the middle are arranged close to the centerline and the distance from the centerline should be greater than 0. In addition, the distance between the two gas drag reduction devices 100 close to the centerline in the fifth group is greater than the distance between the two gas drag reduction devices 100 close to the centerline in the fourth group. By such arrangement, it can be ensured that after the gas is sprayed out of the ship body, the gas can cover the ship body in a larger range as far as possible after the development of the water flow around the ship body, thereby improving the coverage rate of the gas around the ship body and improving the drag reduction effect.

[0062] The gas drag reduction device 100 of the embodiment has strong adaptability, and by designing the angle and number of the flow guide pipe 1, it can be applied to any ship type without affecting the original ship structure arrangement. In addition, the gas drag reduction device 100 of the embodiment only needs to be holed at the contact position of the end of the flow guide pipe 1 and the ship bottom plate 1000, and has less influence on the ship structure.

[0063] The flow guide cover 2 of the embodiment can make the gas be sprayed out close to the ship bottom plate 1000, so that the coverage efficiency of the gas on the ship body surface is higher, thereby bringing higher drag reduction rate per unit volume of gas.

[0064] The part of the embodiment protruding from the ship body is small, and the additional drag caused is smaller; the protruding design of the flow guide cover 2 of the embodiment has a more flexible arrangement area and a more diverse spray angle, for example, to generate a gas layer covering the ship width direction, the embodiment only needs to design a reasonable number of flow guide pipes 1 and spray directions, and arranging several gas drag reduction devices in the projection direction of the ship width can realize the full-ship-width coverage of the gas layer.

[0065] The arrangement scheme provided by the embodiment, in combination with the gas drag reduction device 100 provided by the embodiment, can realize the full-ship-width coverage of the gas layer without covering the entire ship width in the projection of the gas drag reduction device 100 in the ship width direction.

[0066] The above embodiments are only illustrative of the principles of the present application and its efficacy, and are not intended to limit the present application. Any modification or change made by any person skilled in the art without departing from the spirit and scope of the present application shall be covered by the claims of the present application.

Claims

1. A gas drag reduction jet device, characterized by, include: Gas supply components; A flow guide tube, 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. The flow guide tube is truncated triangular in shape, and the cross-sectional area of ​​the flow guide tube in the vertical direction gradually increases from the end near the air supply assembly to the end of the flow guide cover. The flow guide tube is configured to form a preset angle with 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, the narrow slit is used for gas to be ejected and for the gas to flow along the bottom plate. The side of the flow guide cover facing the flow guide tube has a groove, the groove is used to form the narrow slit when the flow guide cover is covered in the through hole, and the side of the flow guide cover away from the flow guide tube is a quarter ellipsoid. There are multiple flow guide tubes, each of which is connected to the gas supply assembly. There are also multiple flow guide caps, each corresponding to one of the multiple flow guide tubes. The multiple guide pipes are arranged at intervals around the air supply assembly, and there is a preset angle between two adjacent guide pipes.

2. The gas drag reduction jet apparatus of claim 1, wherein: 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.

3. The gas-drag-reducing air injector of claim 2, wherein: The size of the air outlet is inversely proportional to the number of air outlets.

4. The gas drag reduction injector of claim 2, wherein: 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.

5. The gas-drag reduction air injection device of claim 2, wherein: The air supply assembly also includes a base configured to be mounted on a flat plate on the bottom of the ship, with the air chamber located above the base.

6. The gas-drag-reducing air injector of claim 5, wherein: 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.

7. A vessel characterised in that: It includes a bottom plate and a gas drag reduction jet device as described in any one of claims 1-6, disposed on the bottom plate.

8. A method of adjusting the gas injection of a gas-drag reduction device according to any one of claims 1-6, 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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