Bottom blowdown stabilization assembly and vessel

Abstract

This application discloses a ship bottom jet stabilization assembly and a ship, in which at least one row of jet holes is opened in the ship bottom along a first direction, the ship bottom jet stabilization assembly includes a flow guide and an external protruding member, the flow guide is attached to the ship bottom, both ends of the flow guide in a second direction are a first end and a second end, the first end is located upstream of the second end, the external protruding member is attached to the ship bottom and connected to the second end, the external protruding member is spaced apart from the at least one row of jet holes and located upstream of the at least one row of jet holes, the outer peripheral surface of the external protruding member facing the at least one row of jet holes is an arcuate surface, and the first direction is the width direction of the ship.

Description

[Technical Field]

[0001] This application claims priority to a Chinese patent application bearing application number 202211607956.9, filed with the China Patent Office on December 14, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of ships, and primarily to bottom jet stabilization assemblies and ships. [Background technology]

[0003] As the shipping industry places increasing demands on ship energy conservation, innovative energy-saving technologies such as bottom-floor blowdown resistance reduction are increasingly being applied to large transport vessels. The principle of bottom-floor blowdown resistance reduction is to install a blowdown pipe at the bottom of the vessel and continuously blow out gas from the pipe, thereby interposing the gas between the vessel's bottom and the water, partially separating the vessel's bottom from the water and further reducing the contact area between the vessel's bottom and the water, thereby reducing the water resistance of the vessel. The more stable the blowdown gas is and the slower it dissipates, the better the resistance reduction effect. To further stabilize the gas and improve the resistance reduction effect, a pore structure can be installed at the bottom of the vessel. In related art, a pore structure often has a guide baffle installed upstream of the blowdown hole, creating a low-pressure area behind the guide baffle. After the gas is blown out, the low-pressure effect causes the gas to gather in the low-pressure area, slowing the diffusion rate of the bubbles.

[0004] However, as the ship moves forward, the water current flows rearward and tends to form large, strong, columnar vortices that rotate clockwise in the low-pressure area behind the guide baffle. If the strength of such vortices is too great, they will exert a shearing effect on the gas, accelerating the diffusion rate of the broken bubbles, which is detrimental to reducing the resistance of the ship. Summary of the Invention [Problem to be solved by the invention]

[0005] The present application provides a ship bottom blowout stabilization assembly and a ship that can reduce the size and strength of vortices, slow the diffusion speed of bubbles, and improve the drag reduction effect of blowouts. [Means for solving the problem]

[0006] A ship bottom blast stabilization assembly having at least one row of blast holes opened along a first direction on the ship bottom, a flow guide attached to the bottom of the vessel, the flow guide having a first end and a second end in the second direction, the first end being located upstream of the second end; an outward protruding member attached to the bottom of the vessel and connected to the second end, spaced apart from the at least one row of blowholes and located upstream of the at least one row of blowholes, the outer circumferential surface facing the at least one row of blowholes being an arcuate surface, and the first direction being the width direction of the vessel; Bottom blowdown stabilization assembly.

[0007] In a preferred embodiment, the height of the cross section gradually increases from the first end to the second end, and one end of the arcuate surface connected to the second end is at the same height as the second end.

[0008] In a preferred embodiment, the size of the external protruding member in the second direction is a, the height of the bottom jet stabilization assembly is b, 0.5b≦a≦b, and the second direction is the longitudinal direction of the ship.

[0009] In a preferred embodiment, the height of the ship bottom jet stabilization assembly is b, the distance from the outward protruding member to the center of the row of jet holes closest to the outward protruding member is c, and 3b≦c≦5b.

[0010] In a preferred embodiment, the size of the flow guide in the second direction is d, the length of the vessel is e, 0.005e≦d≦0.006e, and the second direction is the longitudinal direction of the vessel.

[0011] In a preferred embodiment, the wedge angle of the first end is in the range of 5° to 8°.

[0012] In a preferred embodiment, both side edges of the bottom jet stabilization assembly in the first direction are inclined from the outer protruding member to the flow guide toward the central longitudinal plane of the ship.

[0013] In a preferred embodiment, the angle between each of the two side edges of the bottom jet stabilization assembly in the first direction and the second direction is F, where 15°≦F≦20°, and the second direction is the longitudinal direction of the ship.

[0014] In a preferred embodiment, the bottom jet stabilization assembly is provided symmetrically with respect to the central longitudinal plane of the ship.

[0015] A vessel having at least one row of blowholes opened in the bottom along a first direction, The bottom blast stabilization assembly is attached to the bottom of the vessel, and the bottom blast stabilization assembly is located upstream of the blast hole. ship. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a structural schematic diagram of a vessel bottom jet stabilization assembly according to an embodiment of the present application attached to the vessel bottom. [Figure 2] 2 is a structural schematic diagram 2 of a vessel bottom jet stabilization assembly according to an embodiment of the present application attached to the vessel bottom. [Figure 3] 1 is a structural schematic diagram 1 of a vessel bottom jet stabilization assembly according to an embodiment of the present application. [Figure 4] 2 is a structural schematic diagram 2 of a vessel bottom jet stabilization assembly according to an embodiment of the present application. [Explanation of symbols]

[0017] 100 Bottom Blower Stabilization Assembly 10 Flow Guide 11 1st end 12 2nd end 20 Outer protruding member 21 Arc Surface 200 hull 210 Fumarole 300 central longitudinal section DETAILED DESCRIPTION OF THE INVENTION

[0018] The present application will be described below with reference to the drawings and examples. It will be understood that the examples described here are merely for the purpose of illustrating the present application and are not intended to limit the present application.

[0019] In the description of this application, unless otherwise clearly specified or limited, the terms "connected," "coupled," and "fixed" should be interpreted broadly, and may refer to, for example, a fixed connection, a detachable connection, an integral molding, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art will be able to understand the meaning of the above terms in the present application depending on the context.

[0020] In this disclosure, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include direct contact between the first and second features, or may include contact between the first and second features via another feature between them rather than direct contact. Furthermore, a first feature being "above," "above," and "on the upper surface" of a second feature may include the first feature being directly above and diagonally above the second feature, or may simply mean that the first feature is higher in horizontal height than the second feature. A first feature being "below," "below," and "on the lower surface" of a second feature may include the first feature being directly below and diagonally below the second feature, or may simply mean that the first feature is lower in horizontal height than the second feature.

[0021] In the description of the present embodiment, the terms "upper," "lower," "left," "right," and other orientations or positional relationships are merely used to facilitate the description and simplify the operation based on the orientations or positional relationships shown in the drawings, and do not indicate or imply that the indicated devices or elements necessarily have a specific orientation or must be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present application. Furthermore, the terms "first" and "second" are merely used to distinguish between the two in the description and have no special meaning.

[0022] As shown in Figure 1, at least one row of blowholes 210 is formed in the bottom 200 of the vessel along a first direction (the X direction in Figure 1, i.e., the width direction of the vessel). The blowholes 210 blow out air to form a gas layer between the bottom 200 and the water, reducing the resistance of the vessel as it moves forward. The slower the blown gas dissipates, the better the resistance reduction effect. To further stabilize the gas and improve the resistance reduction effect, a pore structure may be arranged in the bottom 200. In the pore structure of the related art, a guide baffle is often provided at the front end of the blowhole 210, and the guide baffle and the bottom 200 form a low-pressure area. After the bubbles are blown out, the low-pressure effect causes the bubbles to gather in the low-pressure area, slowing down the diffusion speed of the bubbles.

[0023] However, as the ship moves forward, the water current flows rearward and tends to form large, strong, columnar vortices that rotate clockwise in the low-pressure area behind the guide baffle. If the size and strength of such vortices are too large, they will exert a shearing effect on the gas, accelerating the diffusion rate of the fragmented bubbles, which is detrimental to reducing the resistance of the ship.

[0024] This embodiment provides a ship bottom gas stabilization assembly 100 that can reduce the size and strength of vortices, slow the diffusion rate of gas, and improve the resistance reduction effect of gas. As shown in Figures 1 to 3, the ship bottom gas stabilization assembly 100 includes a flow guide 10 and an outer protruding member 20. The flow guide 10 is attached to the ship bottom 200, and both ends of the flow guide 10 in the second direction (the Y direction in the figures, i.e., the longitudinal direction of the ship) are a first end 11 and a second end 12, respectively. The first end 11 is located upstream of the second end 12. The outer protruding member 20 is attached to the ship bottom 200 and connected to the second end 12. The outer protruding member 20 is spaced apart from the gas hole 210 and located upstream of the gas hole 210. The outer peripheral surface of the outer protruding member 20 facing the gas hole 210 is an arc surface 21.

[0025] The outer protruding member 20 is provided downstream of the flow guide 10, with the arcuate surface 21 of the outer protruding member 20 facing the blowout hole 210. This is equivalent to adding a suppression structure to the path of strong vortex formation in the low-pressure area behind the flow guide 10 where strong vortices are likely to form. The installation of the outer protruding member 20 also occupies the original spatial location of vortex generation. That is, the vortices would originally gather and intensify at the second end 12, but now the outer protruding member 20 fills this area. The installation of the arcuate surface 21 of the outer protruding member 20 ensures the formation of a low-pressure area and prevents the gathered bubbles from diffusing. This prevents the vortex from gradually intensifying along the plane, but rather serves to gradually weaken the vortex, reducing the size and strength of the vortex. This also reduces the shearing effect of the vortex on the bubbles, preventing them from quickly dissipating due to the shearing effect of the vortex, and improves the drag reduction effect of the blowout.

[0026] Preferably, the cross-sectional height from the first end 11 to the second end 12 gradually increases, and the end of the arc surface 21 connected to the second end 12 is at the same height as the second end 12, thereby reducing the water resistance of the flow guide 10. As can be seen, the flow guide 10 has a wedge-shaped structure, i.e., the first end 11 is a pointed end and the second end 12 is a larger end, in order to reduce the water resistance of the flow guide 10. In other embodiments, the flow guide surface of the flow guide 10 may be curved, and this is not limited here.

[0027] Preferably, the connection point between the arc surface 21 and the second end 12 is installed with a fairing, so as to minimize the ridge structure on the outer surface of the bottom jet stabilization assembly 100 and reduce the resistance of the bottom jet stabilization assembly 100 to water.

[0028] As shown in FIG. 1, since a row of blowholes 210 are generally arranged symmetrically along the central longitudinal section 300 of the ship, the bottom blowhole stabilization assembly 100 is arranged symmetrically with respect to the central longitudinal section 300 of the ship to ensure that the bottom blowhole stabilization assembly 100 is within the coverage area upstream of the blowholes 210.

[0029] Preferably, as shown in FIG. 2, the size of the outer protruding member 20 in the second direction is a, the height of the underwater jet stabilization assembly 100 is b, and 0.5b≦a≦b. If a is too small, the relaxation effect on the vortex will be insignificant, while if a is too large, it will affect the formation of a low-pressure area. Therefore, 0.5b≦a≦b is the preferred numerical range for a.

[0030] Preferably, as shown in FIG. 2, the distance from the outer protruding member 20 to the center of the nearest row of blowholes 210 is c, and 3b≦c≦5b. If the value of c is too large, the low-pressure area formed by the underwater blowhole stabilization assembly 100 and the effect of weakening the vortex will be lost. If c is too small, the low-pressure area will be compressed and the bubble gathering effect will not be obvious. Therefore, 3b≦c≦5b is the preferred range for c.

[0031] Preferably, the size of the flow guide 10 in the Y direction is d, the length of the ship is e, and 0.005e≦d≦0.006e. The flow guide 10 should not be too large, and if the flow guide 10 is too large, excessive resistance will be generated in the flow guide 10. Therefore, 0.005e≦d≦0.006e is the preferred numerical range for d.

[0032] Preferably, the wedge angle of the first end 11 is in the range of 5° to 8°, and taking into consideration that the wedge angle should not be too large, the flow guide 10 is made long and flat to reduce the resistance of the flow guide 10 as much as possible.

[0033] Preferably, both side edges of the bottom stabilization assembly 100 in the X direction are inclined from the outer protruding member 20 to the flow guide 10 toward the central longitudinal section 300 of the ship. This arrangement allows both sides of the bottom stabilization assembly 100 to perform a certain flow guiding function as the ship moves in the Y direction, reducing resistance. As shown in FIG. 4, the angle between both side edges of the bottom stabilization assembly 100 in the X direction and the Y direction is F, and the angle is 15°≦F≦20°. The angle can be set in consideration of the angle of the bow, and a detailed description of this angle will be omitted here.

[0034] This embodiment further provides a ship, which adopts the above-mentioned bottom gas stabilization assembly 100 to reduce the size of the vortex on the bottom 200 of the ship, weaken the strength of the vortex, improve the stability of the gas on the surface of the bottom 200 of the ship, and improve the resistance reduction effect of the ship's gas.

Claims

1. A ship bottom suction stabilization assembly having at least one row of suction holes (210) opened along a first direction on a ship bottom (200), a flow guide (10) attached to the bottom (200) of the vessel, the flow guide having a first end (11) and a second end (12) at both ends in the second direction, the first end (11) being located upstream of the second end (12); an outer protruding member (20) attached to the bottom (200) of the ship and connected to the second end (12), spaced apart from the at least one row of blowholes (210) and located upstream of the at least one row of blowholes (210), the outer circumferential surface facing the at least one row of blowholes (210) being an arcuate surface (21), and the first direction being the width direction of the ship; Bottom blowdown stabilization assembly.

2. The height of the cross section from the first end (11) to the second end (12) gradually increases, and one end of the arcuate surface (21) connected to the second end (12) is at the same height as the second end (12).

10. The vessel bottom blast stabilization assembly of claim 1.

3. The size of the outer protruding member (20) in the second direction is a, the height of the bottom jet stabilization assembly is b, 0.5b≦a≦b, and the second direction is the longitudinal direction of the ship.

10. The vessel bottom blast stabilization assembly of claim 1.

4. The height of the ship bottom jet stabilization assembly is b, and the distance from the outer protruding member (20) to the center of the row of jet holes (210) closest to the outer protruding member (20) is c, where 3b≦c≦5b.

10. The vessel bottom blast stabilization assembly of claim 1.

5. The size of the flow guide (10) in the second direction is d, the length of the vessel is e, and 0.005e≦d≦0.006e, and the second direction is the longitudinal direction of the vessel.

10. The vessel bottom blast stabilization assembly of claim 1.

6. The wedge angle of the first end (11) is in the range of 5° to 8°.

6. A vessel bottom blast stabilization assembly according to any one of claims 1 to 5.

7. The side edges of the bottom jet stabilization assembly in the first direction are inclined from the outer protruding member (20) to the flow guide (10) toward the central longitudinal plane (300) of the ship.

6. A vessel bottom blast stabilization assembly according to any one of claims 1 to 5.

8. an angle F between each of the two side edges of the bottom jet stabilization assembly in the first direction and the second direction, where F is 15°≦F≦20°, and the second direction is the longitudinal direction of the ship; 8. The vessel bottom blast stabilization assembly of claim 7.

9. The bottom jet stabilization assembly is arranged symmetrically with respect to the central longitudinal plane (300) of the ship.

6. A vessel bottom blast stabilization assembly according to any one of claims 1 to 5.

10. A ship having at least one row of blowholes (210) opened along a first direction on its bottom (200), The bottom spit stabilization assembly according to any one of claims 1 to 9 is attached to the bottom of the vessel (200), and the bottom spit stabilization assembly is located upstream of the at least one row of spit holes (210). ship.

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