Marine gas drag reduction device and ship

Abstract

The marine gas resistance reduction device is characterized in that the marine gas resistance reduction device comprises gas supply equipment, an air pipeline arranged in the length direction of the ship and a plurality of flow guide structures, and the flow guide structures are obliquely arranged on a ship bottom shell plate at intervals; the included angle between the arrangement direction of each flow guide structure and the water flow direction is smaller than 90 degrees, and the air pipeline communicates with air supply equipment and an air separation cavity between each flow guide structure and the hull bottom shell plate. The ship comprises the drag reduction device. The gas separation cavity is formed between the flow guide structures which are continuously arranged and the ship bottom shell plate, the generation range and the generation effect of the gas film layer are expanded, gas in the gas separation cavity is blocked by the flow guide structures which are arranged front and back in the dissipation process, the gas loss speed is reduced, and through the design that the flow guide structures are not perpendicular to the water flow direction, the gas film layer generation effect is improved. The resistance borne by the flow guide structure is reduced, and the resistance reduction effect of the marine gas resistance reduction device is improved on the whole.

Description

Technical Field

[0001] The present invention relates to the technical field of ship energy saving and drag reduction, and in particular to a ship-used gas drag reduction device and a ship. Background Art

[0002] With the increasing global attention to environmental protection and energy efficiency, the shipping industry is also constantly seeking effective ways to reduce fuel consumption and reduce carbon dioxide emissions. As a new energy efficiency technology, ship air lubrication drag reduction technology has attracted attention for its potential in reducing ship friction resistance. This technology uses the difference in density and viscosity between air and water to form a gas-liquid mixed layer or air film layer by injecting an appropriate amount of gas at the bottom of the ship, thereby reducing the friction resistance between the hull and the water.

[0003] In the existing ship air lubrication drag reduction technology, a common practice is to set a drag reduction device under the bow and inject gas into the bottom of the ship through the device. However, this method has shortcomings. On the one hand, due to the position and design limitations of the drag reduction device, the range of the air film generated is relatively small, which limits its drag reduction effect. On the other hand, due to the escape of bubbles, the air film layer generated on the bottom of the ship is difficult to remain stable for a long time, which directly affects the drag reduction efficiency. In addition, the existing technology also has challenges in the generation and maintenance of the air film, and a more efficient and reliable method is needed to ensure the continuity and uniformity of the air film. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art marine gas drag reduction device, such as small air film layer formation range, poor drag reduction efficiency, poor continuity and uniformity of the air film layer, and to provide a marine gas drag reduction device.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A ship-borne gas drag reduction device, characterized in that the ship-borne gas drag reduction device includes an air supply device, an air duct arranged along the length direction of the ship, and a plurality of flow-guiding structures, wherein the plurality of flow-guiding structures are arranged at intervals and inclined on the bottom hull plate of the ship, and the angle between the setting direction of each flow-guiding structure and the water flow direction is less than 90 degrees, and the air duct is connected to the air supply device and the air-isolating cavity between each flow-guiding structure and the bottom hull plate of the ship.

[0007] In the present scheme, by means of air ducts and a number of guide structures arranged along the length direction of the ship, an air-isolating cavity is formed between the continuously arranged guide structures and the bottom hull plate, thereby expanding the generation range and generation effect of the air film layer. Through the above-mentioned arrangement, the gas in the air-isolating cavity is blocked by the guide structures arranged in front and behind during the escape process, thereby reducing the gas loss rate, increasing the stability of the air film layer and the efficiency of gas drag reduction; on the other hand, by making the angle between the setting direction of the guide structure and the water flow direction less than 90 degrees, the water flow direction is not perpendicular to the guide structure, thereby reducing the resistance suffered by the guide structure.

[0008] Preferably, along the water flow direction, the projection of the obliquely extended end of the rear flow guiding structure on the bottom hull plate exceeds the fixed end of the front flow guiding structure connected to the bottom hull plate.

[0009] In the present scheme, the projection of the inclined extended end of the rear guide structure on the bottom hull plate exceeds the fixed end connecting the previous guide structure to the bottom hull plate, which limits the opening size of the air-isolating cavity formed between the continuous guide structures, making it more difficult for the gas to escape from the air-isolating cavity, reducing the gas loss rate, increasing the stability of the air film layer, and improving the drag reduction effect.

[0010] Preferably, the flow-guiding structure is arc-shaped and extends obliquely in a direction away from the bottom hull plate of the ship.

[0011] In this scheme, the guide structure is streamlined by extending it in an arc shape in a direction away from the bottom hull plate to reduce the water resistance. On the other hand, the gas is guided to flow along the arc-shaped guide structure, making it easier to form an air film at the junction of the gas and water flow, thereby improving the drag reduction effect.

[0012] Preferably, the air duct is provided with a plurality of air holes along the length direction, each air-isolating cavity is connected with the air duct through at least one air hole, and the connecting port between each air-isolating cavity and the air hole is provided near the fixed end where the guide structure is connected with the bottom hull plate.

[0013] In this solution, by arranging the connecting opening between each air-isolating cavity and the air hole near the fixed end where the guide structure is connected to the bottom hull plate, the flow path of the gas in the guide structure is extended, the maintenance time of the air film layer is extended, and the drag reduction effect is improved.

[0014] Preferably, the flow-guiding structures are evenly spaced and arranged on the bottom hull plate along the length direction; and / or, the inclination angle of each flow-guiding structure is consistent.

[0015] In this scheme, the guide structure is evenly spaced along the length direction on the bottom hull plate of the ship, so that the air-isolating cavities that generate the air film are evenly spaced. Due to the evenly spaced arrangement, the sizes of the air-isolating cavities are also the same, so that the thickness of the air film layer generated by the bubbles in different air-isolating cavities is more uniform and the escape time is closer, so that the air film layer as a whole is more stable and uniform, thereby improving the stability of drag reduction.

[0016] Preferably, a hydrophobic material is provided on the side of the flow-guiding structure that abuts against the water flow direction.

[0017] In this solution, by providing a hydrophobic material on the surface of the guide structure opposite to the water flow direction, the water flow is not likely to stay on the surface of the guide structure opposite to the water flow direction, thereby reducing the resistance of the guide structure.

[0018] Preferably, a stop valve is provided between the air supply device and the air pipeline, the air pipeline is connected to the air hole through an air branch pipe, and a one-way check valve is provided in the air branch pipe.

[0019] In this solution, a stop valve is provided between the air supply equipment and the air pipe, and the air pipe is connected to the air hole through an air branch pipe. A one-way check valve is provided in the air branch pipe to prevent backflow of seawater and gas, thereby increasing the safety and watertightness of the ship.

[0020] The present invention also includes the following technical solutions:

[0021] A ship comprises the above-mentioned ship-use gas drag reduction device.

[0022] In this solution, the ship installs the above-mentioned ship gas drag reduction device on the bottom hull of the ship to achieve the drag reduction effect during the ship's navigation.

[0023] Preferably, the flow guiding structure extends toward both sides of the bottom hull of the ship along the width direction of the ship.

[0024] In this scheme, by extending the guide structure to both sides of the bottom hull of the ship along the width direction of the ship, the layout area of ​​the guide structure is expanded, and then the distribution range of the air-trapping cavity is expanded, thereby increasing the generation range of the air film layer and improving the drag reduction effect.

[0025] Preferably, a plurality of guide structures are distributed from the bow to the stern along the length direction; along the length direction, the guide structure close to the stern and the power assembly located at the stern are arranged at intervals.

[0026] In this scheme, a number of guide structures are distributed from the bow to the stern along the length direction of the ship, so that the distribution range of the guide structures is larger and the generation range of the air film layer is increased; along the length direction, the ship prevents a large number of bubbles escaping from the guide structure from flowing to the stern, thereby interfering with or corroding the power components at the stern.

[0027] The positive and progressive effects of the present invention are as follows: by arranging air ducts and a plurality of guide structures along the length direction of the ship, an air-isolating cavity is formed between the continuously arranged guide structures and the bottom hull plate, thereby expanding the generation range and generation effect of the air film layer, and by the arrangement, the gas in the air-isolating cavity is blocked by the guide structures arranged in front and behind during the escape process, thereby reducing the gas loss rate, increasing the stability of the air film layer and the efficiency of gas drag reduction; on the other hand, by setting the angle between the direction and the water flow direction to be less than 90 degrees, the water flow direction is not perpendicular to the guide structure, thereby reducing the resistance of the guide structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The figure is a schematic diagram of the structure of a marine gas drag reduction device on a ship according to an embodiment of the present invention.

[0029] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of part A in the figure.

[0030] Figure 3 This is a schematic diagram of the cross-sectional structure of a marine gas drag reduction device on a ship according to an embodiment of the present invention.

[0031] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of part B in the middle.

[0032] Description of reference numerals:

[0033] Length direction 10

[0034] Water flow direction 20

[0035] Ship 1

[0036] Inner layer 90

[0037] Bottom hull plate 100

[0038] Gas supply equipment 105

[0039] Stop valve 106

[0040] Air duct 110

[0041] Air hole 111

[0042] One-way check valve 112

[0043] Air branch pipe 113

[0044] Watertight bulkhead 120

[0045] Air barrier cavity 150

[0046] Diversion structure 200

[0047] Fixed end 201 DETAILED DESCRIPTION

[0048] The present invention is further described below by way of embodiments, and the present invention is described more clearly and completely in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0049] like Figure 1-Figure 4 As shown, this embodiment provides a ship-borne gas drag reduction device, which includes an air supply device 105, an air duct 110 arranged along the length direction 10 of the ship 1, and a plurality of guide structures 200. The plurality of guide structures 200 are spaced and inclined on the bottom hull 100. The angle between the setting direction of each guide structure 200 and the water flow direction 20 is less than 90 degrees. The air duct 110 is connected to the air supply device 105, and an air separation cavity 150 between each guide structure 200 and the bottom hull 100.

[0050] In this embodiment, an air duct 110 and a plurality of guide structures 200 are arranged along the length direction 10 of the ship 1, so that an air-isolating cavity 150 is formed between the continuously arranged guide structures 200 and the bottom hull 100, thereby expanding the generation range and generation effect of the air film layer. Through the above arrangement, the gas in the air-isolating cavity 150 is blocked by the guide structures 200 arranged in front and behind during the escape process, thereby reducing the loss rate of the gas, increasing the stability of the air film layer and the efficiency of gas drag reduction; on the other hand, by making the angle between the setting direction of the guide structure and the water flow direction 20 less than 90 degrees, the water flow direction 20 is not perpendicular to the guide structure 200, thereby reducing the resistance of the guide structure 200.

[0051] Specifically, Figure 1 and Figure 2 As shown, the bottom of the ship 1 is provided with a double bottom structure, the double bottom structure includes an inner layer 90 and a bottom shell 100, an air duct 110 is provided between the inner layer 90 and the bottom shell 100, and the air duct 110 extends along the length direction 10 of the ship 1. A watertight bulkhead 120 is provided in the double bottom structure, and the two ends of the watertight bulkhead 120 are respectively connected to the inner layer 90 and the bottom shell 100, and the double bottom structure is divided to form a chamber for accommodating the air duct 110. The watertight bulkhead 120 is provided to reduce the risk of water leakage at the bottom of the ship.

[0052] like Figure 1 and Figure 2 As shown, along the water flow direction 20, the projection of the end of the inclined extension of the latter flow guiding structure 200 on the bottom shell 100 is flush with the fixed end 201 of the previous flow guiding structure 200 connected to the bottom shell 100. The opening size of the air-isolating cavity 150 formed between the continuous flow guiding structures 200 is limited, making it more difficult for gas to escape from the air-isolating cavity 150, reducing the gas loss rate, increasing the stability of the air film layer, and improving the drag reduction effect.

[0053] In other embodiments, the projection of the obliquely extended end of the rear guide structure 200 on the bottom hull 100 can be set to exceed the fixed end 201 at which the previous guide structure 200 is connected to the bottom hull 100, thereby further limiting the opening size of the air-isolating cavity 150 formed between consecutive guide structures 200, so as to further increase the stability of the air film layer and improve the drag reduction effect.

[0054] like Figure 1 and Figure 2 As shown, the flow guiding structure 200 extends obliquely in an arc shape away from the bottom shell plate 100. By making the flow guiding structure 200 extend obliquely in an arc shape away from the bottom shell plate 100, the flow guiding structure 200 is streamlined to reduce the water flow resistance; on the other hand, the gas is guided to flow along the arc-shaped flow guiding structure 200, so that the gas and water flow junction are more likely to form an air film, thereby improving the drag reduction effect.

[0055] like Figure 1-Figure 4 As shown, the air duct 110 is provided with a plurality of air holes 111 along the length direction 10, each air-isolating cavity 150 is connected with the air duct 110 through at least one air hole 111, and the connecting port of each air-isolating cavity 150 and the air hole 111 is provided near the fixed end 201 where the flow-guiding structure 200 is connected with the bottom shell 100. By providing the connecting port of each air-isolating cavity 150 and the air hole 111 near the fixed end 201 where the flow-guiding structure 200 is connected with the bottom shell 100, the flow path of the gas in the flow-guiding structure 200 is extended, the maintenance time of the air film layer is extended, and the drag reduction effect is improved.

[0056] like Figure 1 and Figure 2 As shown, the flow guiding structures 200 are evenly spaced on the bottom shell 100 along the length direction 10; and / or, the inclination angle of each flow guiding structure 200 is consistent. By evenly spaced on the bottom shell 100 along the length direction 10, the air-isolating cavities 150 for generating air films are evenly spaced. Due to the evenly spaced arrangement, the sizes of the air-isolating cavities 150 are also the same, so that the thickness of the air film layer generated by the bubbles in different air-isolating cavities 150 is more uniform, and the escape time is closer, so that the air film layer as a whole is more stable and uniform, and the stability of drag reduction is improved.

[0057] In this embodiment, a hydrophobic material (not shown) is provided on the surface of the guide structure 200 on one side relative to the water flow direction 20, so that the water flow is not likely to stay on the surface of the guide structure 200 on one side relative to the water flow direction 20, thereby reducing the resistance of the guide structure.

[0058] like Figure 1 and Figure 2 As shown, a stop valve 106 is provided between the air supply device 105 and the air pipe 110, and the air pipe 110 is connected to 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. The marine gas drag reduction device prevents the backflow of seawater and gas through the above arrangement, thereby increasing the safety and water tightness of the ship 1.

[0059] This embodiment also provides a ship 1, which includes the above-mentioned ship-use gas drag reduction device.

[0060] like Figure 1-Figure 4 As shown, by installing the above-mentioned ship gas drag reduction device on the bottom hull 100 of the ship 1, the drag reduction effect during the sailing of the ship 1 is achieved.

[0061] like Figure 3 and Figure 4 As shown, the flow-guiding structure 200 extends to both sides of the bottom hull 100 of the ship 1 along the width direction of the ship 1. By extending the flow-guiding structure 200 to both sides of the bottom hull 100 of the ship 1 along the width direction of the ship 1, the arrangement area of ​​the flow-guiding structure 200 is expanded, and then the distribution range of the air-isolating cavity 150 is expanded, thereby increasing the generation range of the air film layer and improving the drag reduction effect.

[0062] like Figure 1 As shown, a plurality of flow guiding structures 200 are distributed from the bow to the stern along the length direction 10; along the length direction, the flow guiding structures 200 near the stern and the power assembly (not shown in the figure) located at the stern are arranged at intervals. The ship 1 has a larger distribution range of the flow guiding structures 200 through the above arrangement, and increases the range of the air film layer; and along the length direction, the ship 1 prevents a large number of bubbles escaping from the flow guiding structures 200 from flowing to the stern, thereby interfering with or corroding the power assembly at the stern by arranging the flow guiding structures 200 near the stern and the power assembly located at the stern at intervals.

[0063] Among them, the spacing size between the guide structure and the power component can be designed by technical personnel in this field according to actual needs and the size of the ship 1, so as to leave space for bubbles to escape and prevent the bubbles escaped from the guide structure 200 from flowing to the power component at the stern.

[0064] In other embodiments, if the power component of the ship 1 is not arranged at the stern, or is not easily affected by bubble turbulence, corrosion, etc., the arrangement of the guide structure 200 along the length direction 10 is not limited by the power component and can be distributed to the stern to expand the generation range of the air film layer.

[0065] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "side", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0066] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A marine gas drag reduction device, characterized in that: The ship-borne gas drag reduction device includes an air supply device, an air duct arranged along the length direction of the ship, and a plurality of flow-guiding structures. The plurality of flow-guiding structures are arranged at intervals and inclined on the lower surface of the bottom hull plate. The angle between the setting direction of each of the flow-guiding structures and the water flow direction is less than 90 degrees. The air duct is connected to the air supply device and the air-isolating cavity between each of the flow-guiding structures and the bottom hull plate.

2. The marine gas drag reduction device according to claim 1, characterized in that: Along the water flow direction, the projection of the obliquely extended end of the latter flow-guiding structure on the bottom hull plate exceeds the fixed end of the former flow-guiding structure connected to the bottom hull plate.

3. The marine gas drag reduction device according to claim 1, characterized in that: The flow guide structure is arc-shaped and extends obliquely in a direction away from the bottom hull plate.

4. The marine gas drag reduction device according to claim 1, characterized in that: The air duct is provided with a plurality of air holes along the length direction, each of the air-isolating cavities is connected with the air duct via at least one of the air holes, and the connecting opening between each of the air-isolating cavities and the air holes is arranged near the fixed end where the flow-guiding structure is connected with the bottom hull plate.

5. The marine gas drag reduction device according to claim 1, characterized in that: The flow-guiding structures are evenly spaced and arranged on the bottom hull plate along the length direction; And / or, the inclination angle of each of the guide structures is consistent.

6. The marine gas drag reduction device according to claim 1, characterized in that: A hydrophobic material is provided on a surface of one side of the flow-guiding structure relative to the water flow direction.

7. The marine gas drag reduction device according to claim 4, characterized in that: A stop valve is arranged between the air supply device 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.

8. A ship, characterized in that: The ship comprises the ship-use gas drag reduction device according to any one of claims 1-7.

9. The vessel according to claim 8, characterized in that: The flow guide structure extends to both sides of the bottom hull plate of the ship along the width direction of the ship.

10. The vessel according to claim 8, characterized in that A plurality of the guide structures are distributed from the bow to the stern along the length direction; along the length direction, the guide structure close to the stern and the power assembly located at the stern are arranged at intervals.

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