CN119796399A - Marine gas drag reduction device and ship - Google Patents
Marine gas drag reduction device and ship Download PDFInfo
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- CN119796399A CN119796399A CN202411407008.XA CN202411407008A CN119796399A CN 119796399 A CN119796399 A CN 119796399A CN 202411407008 A CN202411407008 A CN 202411407008A CN 119796399 A CN119796399 A CN 119796399A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/10—Measures concerning design or construction of watercraft hulls
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Abstract
本发明公开了一种船用气体减阻装置及船舶，其特征在于，船用气体减阻装置包括供气设备、沿船舶的长度方向设置的空气管道和若干个导流结构，若干个导流结构间隔、并倾斜设于船底壳板上，每个导流结构的设置方向与水流方向的夹角小于90度，空气管道连通于供气设备，以及每个导流结构与船底壳板之间的隔气空腔；一种船舶，包括上述减阻装置。本发明通过连续布置的导流结构和船底壳板之间形成隔气空腔，扩大了气膜层的生成范围和生成效果，使隔气空腔内的气体在逸散过程中受前后布置的导流结构阻挡，减少了气体的流失速度，并通过导流结构不与水流方向垂直的设计，减小了导流结构受到的阻力，整体上提高了船用气体减阻装置的减阻效果。
The present invention discloses a ship-use gas drag reduction device and a ship, characterized in that the ship-use gas drag reduction device comprises an air supply device, an air duct arranged along the length direction of the ship and a plurality of flow guide structures, the plurality of flow guide structures are arranged at intervals and tilted on the bottom shell plate of the ship, the angle between the setting direction of each flow guide structure and the water flow direction is less than 90 degrees, the air duct is connected to the air supply device, and the air separation cavity between each flow guide structure and the bottom shell plate of the ship; a ship comprises the above-mentioned drag reduction device. The present invention forms an air separation cavity between the continuously arranged flow guide structures and the bottom shell plate of the ship, thereby expanding the generation range and generation effect of the air film layer, so that the gas in the air separation cavity is blocked by the flow guide structures arranged in front and behind during the dissipation process, thereby reducing the loss speed of the gas, and reducing the resistance of the flow guide structure by designing that the flow guide structure is not perpendicular to the water flow direction, thereby improving the drag reduction effect of the ship-use gas drag reduction device as a whole.
Description
Technical Field
The invention relates to the technical field of ship energy conservation and drag reduction, in particular to a ship gas drag reduction device and a ship.
Background
With the growing global concern for environmental protection and energy efficiency, the marine industry is also continually seeking effective methods of reducing fuel consumption and carbon dioxide emissions. The ship air lubrication drag reduction technology is regarded as a novel energy efficiency technology, and is paid attention to the potential of reducing the friction resistance of the ship. The technology utilizes the difference of air and water in density and viscosity, and forms a gas-liquid mixed layer or a gas film layer by injecting proper amount of gas into the bottom of the ship, thereby reducing the friction resistance between the ship body and the water.
In the existing ship air lubrication drag reduction technology, it is common practice to provide a drag reduction device below the bow of the ship through which gas is injected into the bottom of the ship. However, this method has disadvantages. On the one hand, due to the location and design limitations of the drag reducer, the range of the generated air film is relatively small, which limits the exertion of its drag reducing effect. On the other hand, the film layer generated at the bottom of the ship is difficult to maintain stable for a long time due to the dissipation of bubbles, which directly affects drag reduction efficiency. In addition, the prior art also presents challenges in the generation and maintenance of the gas film, and more efficient and reliable methods are needed to ensure the continuity and uniformity of the gas film.
Disclosure of Invention
The invention aims to overcome the defects of small gas film layer forming range, poor drag reduction efficiency and poor continuity and uniformity of a gas film layer of a marine gas drag reduction device in the prior art.
The invention solves the technical problems by the following technical scheme:
the marine gas drag reduction device is characterized by comprising gas supply equipment, an air pipeline and a plurality of flow guide structures, wherein the air pipeline and the flow guide structures are arranged along the length direction of a ship, the flow guide structures are arranged on a ship bottom shell plate at intervals and in an inclined mode, the included angle between the arrangement direction of each flow guide structure and the water flow direction is smaller than 90 degrees, the air pipeline is communicated with the gas supply equipment, and a gas isolation cavity is formed between each flow guide structure and the ship bottom shell plate.
According to the scheme, through the air pipeline and the plurality of flow guide structures which are arranged along the length direction of the ship, the air separation cavity is formed between the flow guide structures and the ship bottom shell plate which are arranged continuously, the generation range and the generation effect of the air film layer are enlarged, through the arrangement, air in the air separation cavity is blocked by the flow guide structures which are arranged front and back in the dissipation process, the loss speed of the air is reduced, the stability of the air film layer and the efficiency of gas drag reduction are improved, and on the other hand, through the fact that the included angle between the arrangement direction of the flow guide structures and the water flow direction is smaller than 90 degrees, the water flow direction is not perpendicular to the flow guide structures, and the resistance of the flow guide structures is reduced.
Preferably, the projection of the end of the latter deflector extending obliquely onto the bilge plate in the direction of water flow exceeds the fixed end of the former deflector connected to the bilge plate.
In this scheme, the projection of the terminal of the slope of the last water conservancy diversion structure extension on the hull lamella exceeds the stiff end that preceding water conservancy diversion structure and hull lamella are connected, has restricted the opening size of the gas barrier cavity that forms between the continuous water conservancy diversion structure, makes gas more difficult escape from the gas barrier cavity, has reduced the loss rate of gas, has increased the stability of air film layer, improves the effect of drag reduction.
Preferably, the deflector structure extends in an arc-shape inclined away from the bilge plate.
In the scheme, the guide structure is inclined and extends in the direction away from the ship bottom shell plate in an arc shape, so that the guide structure is in streamline arrangement, the received water flow resistance is reduced, on the other hand, gas is guided to flow along the guide structure in the arc shape, so that a gas film is easier to generate at the junction of the gas and the water flow, and the resistance reducing effect is improved.
Preferably, the air pipeline is arranged on a plurality of air holes along the length direction, each air isolation cavity is communicated with the air pipeline through at least one air hole, and the communication port of each air isolation cavity and the air hole is arranged near the fixed end of the flow guide structure, which is connected with the ship bottom shell plate.
In this scheme, establish the stiff end that is close to the water conservancy diversion structure and is connected with the hull bottom lamella through the intercommunication mouth with every gas barrier cavity and gas pocket, the circulation route of extension gas in the water conservancy diversion structure, the maintenance time of extension air film layer improves the effect of drag reduction.
Preferably, the flow guiding structures are arranged on the ship bottom shell plate at uniform intervals along the length direction, and/or the inclination angles of the flow guiding structures are consistent.
In this scheme, through making water conservancy diversion structure along the even interval arrangement of length direction on the hull bottom lamella, make the equidistant even arrangement of gas barrier cavity that produces the air film, because the even interval arrangement mode, the size of gas barrier cavity is also the same, makes the air film layer thickness that the bubble produced in different gas barrier cavities more even, and the loss time is more close to make the whole more stable even of air film layer, improve the stability of drag reduction.
Preferably, a hydrophobic material is arranged on one side of the diversion structure, which is abutted with the water flow direction.
In this scheme, through being equipped with hydrophobic material on the side surface of water conservancy diversion structure for the water flow direction, make rivers be difficult for stopping in the side surface of water conservancy diversion structure for the water flow direction, reduce the resistance that the water conservancy diversion structure received.
Preferably, a stop valve is arranged between the air supply equipment and the air pipeline, the air pipeline is communicated with the air hole through an air branch pipe, and a one-way check valve is arranged in the air branch pipe.
In this scheme, be equipped with the stop valve between air feed equipment and air pipe, through the air branch intercommunication between air pipe and the gas pocket, through being equipped with the one-way check valve in the air branch, prevent that sea water and gas from flowing backward, increased the security and the water proofness of boats and ships.
The invention also comprises the following technical scheme:
A ship comprising a marine gas drag reducer as described above.
In the scheme, the ship is provided with the ship bottom shell plate by the ship gas damping device so as to achieve the damping effect in the ship running process.
Preferably, the flow guiding structure extends in the width direction of the vessel to both sides of the hull bottom plate of the vessel.
In this scheme, through making the water conservancy diversion structure extend to the bottom of the ship hull board both sides of boats and ships along the width direction of boats and ships, enlarged the area of arranging of water conservancy diversion structure, and then enlarged the distribution scope of gas barrier cavity to the formation scope of air film layer has been increased, drag reduction effect has been improved.
Preferably, the plurality of flow guiding structures are distributed from the bow to the stern along the length direction, and the flow guiding structures near the stern and the power assembly positioned at the stern are arranged at intervals along the length direction.
In the scheme, the plurality of flow guiding structures are distributed from the bow to the stern along the length direction of the ship, so that the distribution range of the flow guiding structures is larger, the generation range of the air film layer is increased, and the ship prevents a large amount of air bubbles dissipated in the flow guiding structures from flowing to the stern through the flow guiding structures close to the stern and the power components positioned at the stern to form interference or corrosion on the power components at the stern along the length direction.
The invention has the positive advantages that the air pipeline and the plurality of flow guide structures are arranged along the length direction of the ship, the air isolation cavity is formed between the flow guide structures and the ship bottom shell plate which are arranged continuously, the generation range and the generation effect of the air film layer are enlarged, the air in the air isolation cavity is blocked by the flow guide structures arranged front and back in the dissipation process through the arrangement, the loss speed of the air is reduced, the stability of the air film layer and the gas drag reduction efficiency are improved, and on the other hand, the water flow direction is not perpendicular to the flow guide structure through the arrangement of the included angle between the direction and the water flow direction is smaller than 90 degrees, and the resistance of the flow guide structure is reduced.
Drawings
FIG. 1 is a schematic view of a marine gas drag reducer according to an embodiment of the present invention.
Fig. 2 is an enlarged schematic view of a portion a in fig. 1.
FIG. 3 is a schematic cross-sectional view of a marine gas drag reducer of an embodiment of the present invention on a marine vessel.
Fig. 4 is an enlarged schematic view of a portion B in fig. 3.
Reference numerals illustrate:
Lengthwise 10
Water flow direction 20
Ship 1
Inner layer 90
Bottom hull plate 100
Air supply device 105
Stop valve 106
Air duct 110
Air holes 111
One-way check valve 112
Air branch 113
Watertight bulkhead 120
Air-blocking cavity 150
Flow guiding structure 200
Fixed end 201
Detailed Description
The present invention will be further illustrated by way of examples below, and will be more clearly and fully described in connection with the accompanying drawings, without thereby limiting the scope of the examples.
As shown in fig. 1 to 4, the present embodiment provides a marine gas drag reducing device, which includes a gas supply device 105, an air pipe 110 disposed along a length direction 10 of a ship 1, and a plurality of flow guiding structures 200, the plurality of flow guiding structures 200 being spaced apart and being disposed obliquely on a bilge skin 100, an included angle between a direction in which each flow guiding structure 200 is disposed and a water flow direction 20 being smaller than 90 degrees, the air pipe 110 being communicated with the gas supply device 105, and a gas-blocking cavity 150 between each flow guiding structure 200 and the bilge skin 100.
In this embodiment, through the air pipeline 110 and the plurality of flow guiding structures 200 arranged along the length direction 10 of the ship 1, the air isolation cavity 150 is formed between the flow guiding structures 200 and the ship bottom shell plate 100 which are arranged continuously, the generation range and the generation effect of the air film layer are enlarged, through the arrangement, the air in the air isolation cavity 150 is blocked by the flow guiding structures 200 arranged front and back in the dissipation process, the loss speed of the air is reduced, the stability of the air film layer and the gas drag reduction efficiency are improved, and on the other hand, through the arrangement direction of the flow guiding structures and the included angle of the water flow direction 20 are smaller than 90 degrees, the water flow direction 20 is not perpendicular to the flow guiding structures 200, and the resistance of the flow guiding structures 200 is reduced.
Specifically, as shown in fig. 1 and 2, the bottom of the ship 1 is provided with a double-bottom structure including an inner layer 90 and a bottom hull plate 100, an air duct 110 is provided between the inner layer 90 and the bottom hull plate 100, and the air duct 110 extends along the length direction 10 of the ship 1. Inside the double bottom structure is provided a watertight bulkhead 120, both ends of the watertight bulkhead 120 are connected with the inner layer 90 and the bottom hull plate 100, respectively, and divide the double bottom structure and form a chamber for accommodating the air duct 110. The watertight bulkhead 120 is provided to reduce the risk of leakage from the bottom of the ship.
As shown in fig. 1 and 2, the projection of the end of the latter deflector structure 200 extending obliquely onto the bilge plate 100 is flush with the fixed end 201 of the former deflector structure 200 connected to the bilge plate 100 in the water flow direction 20. The opening size of the gas-insulated cavity 150 formed between the continuous flow guiding structures 200 is limited, so that gas is more difficult to escape from the gas-insulated cavity 150, the loss speed of the gas is reduced, the stability of the gas film layer is improved, and the drag reduction effect is improved
In other embodiments, the projection of the end of the latter deflector 200 extending obliquely onto the bilge plate 100 may be set to exceed the fixed end 201 of the former deflector 200 connected to the bilge plate 100, thereby further limiting the opening size of the air-blocking cavity 150 formed between the consecutive deflector 200, so that the stability of the air film layer is further increased, thereby improving the drag reduction effect.
As shown in fig. 1 and 2, the deflector structure 200 extends obliquely in an arc shape in a direction away from the bilge plate 100. The guide structure 200 is in an arc shape and extends obliquely in a direction away from the ship bottom shell plate 100, so that the guide structure 200 is in a streamline shape, and the resistance to water flow is reduced, on the other hand, gas is guided to flow along the guide structure 200 in the arc shape, so that a gas film is easier to generate at the junction of the gas and the water flow, and the drag reduction effect is improved.
As shown in fig. 1 to 4, the air duct 110 is provided with a plurality of air holes 111 along the length direction 10, each air-blocking cavity 150 is communicated with the air duct 110 through at least one air hole 111, and the communication port between each air-blocking cavity 150 and the air hole 111 is provided near a fixed end 201 connected with the ship bottom shell plate 100 by the flow guiding structure 200. By arranging the communication port between each air isolation cavity 150 and the air hole 111 near the fixed end 201 connected with the ship bottom shell plate 100 and the diversion structure 200, the flow path of air in the diversion structure 200 is prolonged, the maintenance time of the air film layer is prolonged, and the drag reduction effect is improved.
As shown in fig. 1 and 2, the guide structures 200 are uniformly spaced apart on the bottom hull plate 100 in the length direction 10, and/or the inclination angle of each guide structure 200 is uniform. Through making the water conservancy diversion structure 200 evenly spaced arrangement on ship bottom shell plate 100 along length direction 10, make the gas barrier cavity 150 of producing the air film equidistance evenly arranged, because the evenly spaced arrangement mode, the size of gas barrier cavity 150 is also the same, makes the air film layer thickness that the bubble produced in different gas barrier cavities 150 more even, and the loss time is more close to make the air film layer whole more stable even, improve the stability of drag reduction.
In the present embodiment, a hydrophobic material (not shown) is provided on a surface of the diversion structure 200 opposite to the water flow direction 20. The water flow is not easy to stay on one side surface of the diversion structure 200 relative to the water flow direction 20, and the resistance of the diversion structure is reduced.
As shown in fig. 1 and 2, a stop valve 106 is provided between the air supply device 105 and the air pipe 110, the air pipe 110 is communicated with the air hole 111 through an air branch pipe 113, and a one-way check valve 112 is provided in the air branch pipe 113. Through the arrangement, the marine gas drag reduction device prevents the reverse flow of seawater and gas, and increases the safety and the water tightness of the ship 1.
The present embodiment also provides a ship 1, which ship 1 comprises the above-described marine gas drag reduction device.
As shown in fig. 1 to 4, the above-mentioned marine gas drag reducing device is provided on the bottom hull plate 100 of the ship 1 to achieve a drag reducing effect during running of the ship 1.
As shown in fig. 3 and 4, the flow guiding structure 200 extends to both sides of the bottom hull plate 100 of the ship 1 in the width direction of the ship 1. By extending the flow guiding structure 200 to both sides of the bottom hull plate 100 of the ship 1 along the width direction of the ship 1, the arrangement area of the flow guiding structure 200 is enlarged, and the distribution range of the air-isolation cavity 150 is further enlarged, so that the generation range of the air film layer is enlarged, and the drag reduction effect is improved.
As shown in fig. 1, a plurality of flow guiding structures 200 are distributed from the bow to the stern along the length direction 10, and the flow guiding structures 200 near the stern and a power assembly (not shown) at the stern are arranged at intervals along the length direction. The ship 1 has the advantages that the distribution range of the flow guiding structure 200 is larger, the generation range of the air film layer is increased, and the flow guiding structure 200 near the stern and the power assembly positioned at the stern are arranged at intervals along the length direction of the ship 1, so that a large amount of air bubbles dissipated in the flow guiding structure 200 are prevented from flowing to the stern, and interference or corrosion is formed on the power assembly at the stern.
The size of the interval between the flow guiding structure and the power assembly can be designed by a person skilled in the art according to the actual needs and the size of the ship 1, so as to leave a space for air bubbles to escape, and prevent the air bubbles escaping from the flow guiding structure 200 from flowing to the power assembly at the stern.
In other embodiments, if the power components of the ship 1 are not disposed at the stern, or are not easily affected by air bubble turbulence, corrosion, etc., the arrangement of the flow guiding structure 200 along the longitudinal direction 10 is not limited by the power components, and can be distributed to the stern, thereby expanding the generation range of the air film layer.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (10)
1. The marine gas drag reduction device is characterized by comprising gas supply equipment, an air pipeline and a plurality of flow guide structures, wherein the air pipeline is arranged along the length direction of a ship, the flow guide structures are arranged on the lower surface of a ship bottom shell plate at intervals in an inclined mode, the included angle between the arrangement direction of each flow guide structure and the water flow direction is smaller than 90 degrees, the air pipeline is communicated with the gas supply equipment, and each flow guide structure is communicated with a gas isolation cavity between the ship bottom shell plate.
2. The marine gas drag reducing apparatus of claim 1, wherein the projection of the end of the latter said deflector structure extending obliquely onto said bilge plate in the direction of water flow exceeds the fixed end of the former said deflector structure attached to said bilge plate.
3. The marine gas drag reducer of claim 1, wherein said deflector structure extends in an arcuate shape obliquely away from said bilge plate.
4. The marine gas drag reducing apparatus of claim 1, wherein said air conduit is provided with a plurality of air holes along said length direction, each of said air-blocking cavities being in communication with said air conduit through at least one of said air holes, the communication port of each of said air-blocking cavities with said air holes being provided near the fixed end of said flow guiding structure connected with said bilge plate.
5. The marine gas drag reducer of claim 1, wherein said flow directing structures are disposed on the bilge plates at uniform intervals along said length direction;
And/or the inclination angle of each flow guiding structure is consistent.
6. The marine gas drag reducer of claim 1, wherein the flow directing structure is provided with a hydrophobic material on a side surface thereof opposite to the direction of water flow.
7. The marine gas drag reducing apparatus of claim 4, wherein a stop valve is provided between the gas supply device and the air pipe, the air pipe is communicated with the gas hole through an air branch pipe, and a one-way check valve is provided in the air branch pipe.
8. A vessel comprising a marine gas drag reduction device according to any one of claims 1-7.
9. The vessel of claim 8, wherein the flow directing structure extends in a width direction of the vessel to both sides of a bilge plate of the vessel.
10. The vessel of claim 8, wherein a plurality of said flow directing structures are spaced apart along said length from bow to stern, said flow directing structures being positioned adjacent to stern and power assemblies positioned at stern along said length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411407008.XA CN119796399A (en) | 2024-10-10 | 2024-10-10 | Marine gas drag reduction device and ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411407008.XA CN119796399A (en) | 2024-10-10 | 2024-10-10 | Marine gas drag reduction device and ship |
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| Publication Number | Publication Date |
|---|---|
| CN119796399A true CN119796399A (en) | 2025-04-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202411407008.XA Pending CN119796399A (en) | 2024-10-10 | 2024-10-10 | Marine gas drag reduction device and ship |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130133956A (en) * | 2012-05-30 | 2013-12-10 | 현대중공업 주식회사 | Vessels having out side air layer |
| KR20140033797A (en) * | 2012-09-10 | 2014-03-19 | 현대중공업 주식회사 | Air vessel with air bubble generator |
| CN105501388A (en) * | 2008-04-01 | 2016-04-20 | 国立研究开发法人海上技术安全研究所 | Frictional resistance reduction device for ship |
| CN106143787A (en) * | 2015-03-25 | 2016-11-23 | 上海轻航气膜减阻船舶有限公司 | Device at the bottom of ship by air layers reducing resistance economical ship |
| CN106414229A (en) * | 2014-03-05 | 2017-02-15 | 银流技术公司 | Air lubrication system and vessel comprising such a system |
| RU2713320C1 (en) * | 2019-04-09 | 2020-02-04 | Ооо "Центр Качества, Надежности И Долговечности Зданий" | Device for reduction of hydrodynamic resistance of ship hull bottom on compressed airflow |
-
2024
- 2024-10-10 CN CN202411407008.XA patent/CN119796399A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105501388A (en) * | 2008-04-01 | 2016-04-20 | 国立研究开发法人海上技术安全研究所 | Frictional resistance reduction device for ship |
| KR20130133956A (en) * | 2012-05-30 | 2013-12-10 | 현대중공업 주식회사 | Vessels having out side air layer |
| KR20140033797A (en) * | 2012-09-10 | 2014-03-19 | 현대중공업 주식회사 | Air vessel with air bubble generator |
| CN106414229A (en) * | 2014-03-05 | 2017-02-15 | 银流技术公司 | Air lubrication system and vessel comprising such a system |
| CN106143787A (en) * | 2015-03-25 | 2016-11-23 | 上海轻航气膜减阻船舶有限公司 | Device at the bottom of ship by air layers reducing resistance economical ship |
| RU2713320C1 (en) * | 2019-04-09 | 2020-02-04 | Ооо "Центр Качества, Надежности И Долговечности Зданий" | Device for reduction of hydrodynamic resistance of ship hull bottom on compressed airflow |
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