Ship energy-saving guide pipe and ship

Abstract

The invention belongs to the technical field of ships, and provides a ship energy-saving guide pipe and a ship, the ship energy-saving guide pipe is arranged at the tail of a ship body and located on the upstream of a propeller, and the ship energy-saving guide pipe comprises a guide pipe body, the guide vane assembly comprises at least three guide vanes, and the three guide vanes are arranged in the arc direction of the guide pipe body at intervals and connected with the guide pipe body. Wherein the root of one guide vane is fixedly connected to an outer plate at the tail of the ship body, the top of one guide vane is connected with the guide pipe body, the other two guide vanes comprise straight parts and bent parts, the roots of the straight parts are connected with the outer plate at the tail of the ship body, the tops of the straight parts extend out of the guide pipe body in the radial direction of the guide pipe body, and the bent parts are connected to the top ends of the straight parts. The bent part is bent towards one side of the guide vane; compared with a straight guide vane, under the condition that the same pre-rotation effect is achieved, the guide vane structure has a smaller wet surface area, appendage resistance can be reduced, and the energy-saving effect is improved.

Description

Technical Field

[0001] This invention relates to the field of marine technology, and in particular to a marine energy-saving duct and a ship. Background Technology

[0002] Against the backdrop of reducing carbon emissions in ship operations, energy-saving ducts have become the mainstream hydrodynamic energy-saving device in the market due to their significant energy-saving effect and convenient retrofitting methods. By being installed upstream of the propeller to optimize the wake at the stern, they can reduce fuel consumption by 2-8%.

[0003] Existing energy-saving ducts are usually straight-leaf ducts. For ships with low wake fraction, the energy-saving effect of straight-leaf ducts is limited by the appendage resistance caused by the high flow velocity at the stern. Summary of the Invention

[0004] This invention provides a marine energy-saving duct and a ship, to solve the technical problem of limited energy-saving effect of existing energy-saving ducts.

[0005] The present invention provides a marine energy-saving duct, which is installed at the stern of the ship and upstream of the propeller. The marine energy-saving duct includes: The catheter body is an arc shape no larger than a semicircle; A guide vane assembly includes at least three guide vanes, which are spaced apart along the arc direction of the duct body and connected to the duct body respectively; the root of one guide vane is fixedly connected to the outer plate of the stern of the hull, and the top of the guide vane is connected to the duct body; the other two guide vanes include a straight portion and a curved portion, the root of the straight portion is connected to the outer plate of the stern of the hull, the top of the straight portion extends radially out of the duct body, and the curved portion is connected to the top of the straight portion and bends toward one side of the guide vane.

[0006] In one embodiment of the present invention, along the arc direction of the catheter body, two of the three guide vanes are located at both ends of the arc direction of the catheter body, and the other guide vane is located between the two guide vanes.

[0007] In one embodiment of the present invention, the cross-sections of the three guide vanes are all airfoil-shaped, and each guide vane has a first side and a second side opposite to each other along its thickness direction. The first side is a plane, and the second side is a curved surface or an arc surface.

[0008] In one embodiment of the present invention, the curved portion bends toward the first or second side of the guide vane, and the angle between the end face of the curved portion and the first side is 2°-20°.

[0009] In one embodiment of the present invention, along the radial direction of the catheter body, the distance between the top of the straight portion and the root portion is 0.7-0.9 times the propeller radius.

[0010] In one embodiment of the present invention, the distance between the end of the curved portion and the top of the straight portion along the radial direction of the conduit body is 0.05-0.45 times the propeller radius.

[0011] In one embodiment of the present invention, the three guide vanes are a first guide vane, a second guide vane, and a third guide vane. Along the arc direction of the catheter body, the second guide vane is located between the first guide vane and the third guide vane. The second guide vane and the third guide vane have the curved portion. The length of the second guide vane and the third guide vane is greater than the arc radius of the catheter body. The length of the first guide vane is less than the arc radius of the catheter body. The top of the first guide vane is connected to the catheter body.

[0012] In one embodiment of the present invention, along the arc direction of the catheter body, the included angle between the second guide vane and the third guide vane is smaller than the included angle between the second guide vane and the first guide vane.

[0013] In one embodiment of the present invention, the three guide vanes are a first guide vane, a second guide vane, and a third guide vane. Along the arc direction of the catheter body, the second guide vane is located between the first guide vane and the third guide vane. The first guide vane and the third guide vane have the curved portion. The length of the first guide vane and the third guide vane is greater than the arc radius of the catheter body. The length of the second guide vane is less than the arc radius of the catheter body. The top of the second guide vane is connected to the catheter body.

[0014] The present invention also provides a ship, including the ship energy-saving duct as described above.

[0015] The beneficial effects of the present invention are as follows: The energy-saving duct proposed in this invention generates a pre-spinning upstream of the propeller in the opposite direction of propeller rotation through the guide vane. The curved part forms a hook-shaped blade tip at the end of the guide vane, generating an endplate effect, which improves the rectification efficiency of the energy-saving duct. Compared with a straight guide vane, under the condition of achieving the same pre-spinning effect, the guide vane structure of the present invention has a smaller wetted surface area, which can reduce appendage resistance and improve energy-saving effect. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the layout of a ship energy-saving duct at the stern of a ship according to an embodiment of the present invention; Figure 2 This is a first-view structural schematic diagram of a ship energy-saving duct provided in an embodiment of the present invention; Figure 3 This is a second-view structural schematic diagram of a ship energy-saving duct provided in an embodiment of the present invention; Figure 4 A third-view structural schematic diagram of a ship energy-saving duct provided in an embodiment of the present invention; Figure 5 A pressure distribution comparison diagram between a ship energy-saving duct and an existing energy-saving duct provided in an embodiment of the present invention; Figure 6 A comparison diagram of vortex discharge between a ship energy-saving duct provided in an embodiment of the present invention and an existing energy-saving duct.

[0018] The attached figures are labeled as follows: 1-Stern of the hull; 2-Propeller; 3-Guide body; 4-Third guide vane; 5-Second guide vane; 6-First guide vane; 7-Bent section; 8-Straight section; 9-First side; 10-Second side. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0022] It should be noted that existing energy-saving ducts mostly use radial straight guide vanes, meaning the guide vanes have straight tips, resulting in strong radial flow of fluid in the vane tip region, forming tip vortices. These vortices not only increase appendage drag and weaken the pre-swirl effect of the guide vanes on the propeller inlet, but also reduce the propeller's cavitation performance. Generally, the longer the chord length of the guide vane, the better the rectification effect, but the more severe the appendage drag increase. Therefore, this invention provides a marine energy-saving duct with hook-shaped guide vanes. By bending the vane tip to form a hook-shaped structure, an endplate effect is generated, which can improve the flow control efficiency at the guide vane tip and reduce the energy-saving duct resistance. Compared with straight guide vanes, under the condition of achieving the same pre-swirl effect, the guide vane structure of this invention has a smaller wetted surface area, which can reduce appendage drag and improve energy-saving effect.

[0023] Please see Figures 1 to 4 The present invention provides an exemplary energy-saving duct for ships, which is disposed at the stern of the ship and upstream of the propeller. The energy-saving duct includes: The catheter body 3 is an arc segment no larger than a semicircle; The guide vane assembly includes at least three guide vanes, which are spaced apart along the arc direction of the guide vane body 3 and connected to the guide vane body 3 respectively; the root of one guide vane is fixedly connected to the outer plate of the stern 1 of the hull, and the top is connected to the guide vane body 3; the other two guide vanes include a straight part 8 and a curved part 7, the root of the straight part 8 is connected to the outer plate of the stern 1 of the hull, the top of the straight part 8 extends out of the guide vane body 3 radially, and the curved part 7 is connected to the top of the straight part 8 and bends toward one side of the guide vane.

[0024] In the ship energy-saving duct provided in this embodiment, the guide vane generates a pre-spinning upstream of the propeller 2 in the opposite direction to the rotation of the propeller 2. The curved part 7 forms a hook-shaped blade tip at the end of the guide vane, generating an endplate effect and improving the rectification efficiency of the energy-saving duct. Compared with a straight guide vane, under the condition of achieving the same pre-spinning effect, the guide vane structure of the present invention has a smaller wetted surface area, which can reduce appendage resistance and improve energy-saving effect.

[0025] Please refer to Table 1, which is a comparison table of navigation data of the ship before and after the installation of the energy-saving duct of this embodiment. The energy-saving effect is the relative difference in received power. It can be seen that the energy-saving duct of the present invention can demonstrate the energy-saving effect on the ship under various navigation conditions.

[0026] Table 1 Comparison of Navigation Data

[0027] Please refer to Table 2, which compares the energy-saving effect of the energy-saving conduit of this embodiment with that of the conventional energy-saving conduit at some model scales. It can be seen that the energy-saving conduit of this embodiment has an improved energy-saving effect compared with the conventional energy-saving conduit.

[0028] Table 2 Comparison of Energy Saving Effects

[0029] In this embodiment, along the arc direction of the catheter body 3, two of the three guide vanes are located at both ends of the arc direction of the catheter body 3, and the other guide vane is located between the two guide vanes.

[0030] In the above embodiment, the cross-section of all three guide vanes is airfoil-shaped, and each guide vane has a first side surface 9 and a second side surface 10 facing away from each other along its thickness direction. The first side surface 9 is a plane, and the second side surface 10 is a curved surface or an arc surface. Specifically, the curved portion 7 can be bent toward the first side surface 9 or the second side surface 10, and the bending direction of the curved portion 7 is not limited here.

[0031] In detail, the curved portion bends toward either the first side 9 or the second side 10 of the guide vane. The angle α between the end face of the curved portion 7 and the first side 9 is 2°-20°. The curved portion 7 forms a hook-shaped blade tip at the end of the guide vane, thus transforming the guide vane into a hook-shaped guide vane. Specifically, the curved portion 7 can be an arc-shaped structure, a V-shaped structure, or other structures capable of forming a hook-shaped blade tip at the end of the guide vane. The specific structure of the curved portion 7 is not limited here.

[0032] In this embodiment, along the radial direction of the conduit body 3, the distance L1 between the top of the straight portion 8 and the root is 0.7-0.9 times the radius of the propeller 2.

[0033] Furthermore, along the radial direction of the conduit body 3, the distance between the end of the curved portion 7 and the top of the straight portion 8 is 0.05-0.45 times the radius of the propeller 2.

[0034] Please see Figure 5 and Figure 6 , Figure 5 This is a comparison diagram of the pressure distribution of the energy-saving conduit in this embodiment and existing energy-saving conduits. Figure 6This diagram compares the vortex leakage of the energy-saving conduit of this embodiment with that of existing energy-saving conduits. The left side of the diagram represents the energy-saving conduit of this application, while the right side represents an existing energy-saving conduit. It can be seen that the pressure distribution at the tip of the hook-shaped guide vane in this embodiment is significantly more uniform than that of the straight guide vane in existing energy-saving conduits, and it weakens the intensity of vortex leakage at the guide vane tip. The curved portion 7 forms a hook-shaped structure at the tips of the second guide vane 5 and the third guide vane 4, generating an endplate effect and creating a pressure difference with the area where the straight portion is located, suppressing vortex leakage at the blade tip, thereby improving the energy-saving effect of the energy-saving conduit and improving the cavitation performance of the propeller. Compared with the straight guide vane of existing energy-saving conduits, the hook-shaped guide vane of this invention has a smaller wetted surface area under the condition of achieving the same pre-spin effect, which can reduce appendage drag and thus reduce the drag of the energy-saving conduit. Simultaneously, the hook-shaped guide vane can also weaken the formation intensity of periodic vortex streets, improve the local structural stability at the blade tip, and thus improve the structural fatigue life at the connection between the guide vane and the conduit body.

[0035] In one embodiment, the three guide vanes are a first guide vane 6, a second guide vane 5, and a third guide vane 4. Along the arc direction of the conduit body 3, the second guide vane 5 is located between the first guide vane 6 and the third guide vane 4. The second guide vane 5 and the third guide vane 4 have curved portions 7. The lengths of the second guide vane 5 and the third guide vane 4 are greater than the arc radius of the conduit body 3, while the length of the first guide vane 6 is less than the arc radius of the conduit body 3. The top of the first guide vane 6 is connected to the conduit body 3. With this design, the tops of any two guide vanes of the energy-saving conduit extend above the conduit body 3, ensuring that the tips of two of the guide vanes can form hook-shaped tips.

[0036] Furthermore, along the arc direction of the catheter body 3, the included angle between the second guide vane 5 and the third guide vane 4 is smaller than the included angle between the second guide vane 5 and the first guide vane 6. In this embodiment, the second guide vane 5 is disposed close to the third guide vane 4; or the included angle between the second guide vane 5 and the third guide vane 4 is greater than the included angle between the second guide vane 5 and the first guide vane 6, that is, the second guide vane 5 is disposed close to the first guide vane 6.

[0037] In some embodiments, the arc of the duct body 3 is eccentrically set with respect to the stern shaft of the hull. Specifically, the first guide vane 6, the second guide vane 5 and the third guide vane 4 are distributed in a fan shape on the outer plate of the stern 1 of the hull and connected to the duct body 3. The stern shaft of the hull is located at the end of the stern 1 of the hull and is used to install the propeller 2.

[0038] In some embodiments, the distance between the root of the first guide vane 6 and the root of the third guide vane 4 is less than the distance between the top of the first guide vane 6 and the top of the third guide vane 4. Since the first guide vane 6 and the third guide vane 4 are located at both ends of the duct body 3, this design ensures that the three guide vanes are distributed along the arc direction of the duct body 3 at the stern 1 of the hull and connected with the duct body 3 to form a ray-shaped structure.

[0039] In another embodiment, the three guide vanes are a first guide vane 6, a second guide vane 5, and a third guide vane 4. Along the arc direction of the catheter body 3, the second guide vane 5 is located between the first guide vane 6 and the third guide vane 4. The first guide vane 6 and the third guide vane 4 have curved portions 7. The lengths of the first guide vane 6 and the third guide vane 4 are greater than the arc radius of the catheter body 3, and the length of the second guide vane 5 is less than the arc radius of the catheter body 3. The top of the second guide vane 5 is connected to the catheter body 3. In this embodiment, the second guide vane 6 is positioned close to either the first guide vane 6 or the third guide vane 4.

[0040] In another embodiment, the guide vane assembly includes four or five guide vanes, which are spaced apart along the arc direction of the guide vane body and connected to the guide vane body respectively. The root of one or two guide vanes is fixedly connected to the outer plate of the stern of the hull, and the top is connected to the guide vane body. The remaining guide vanes include a straight portion and a curved portion. The root of the straight portion is connected to the outer plate of the stern of the hull, and the top of the straight portion extends radially out of the guide vane body. The curved portion is connected to the top of the straight portion and bends toward one side of the guide vane.

[0041] In another embodiment, the present invention also provides a ship including the above-described ship energy-saving duct.

[0042] In summary, in the ship energy-saving duct and ship provided in this embodiment, the guide vane generates a pre-spinning upstream of the propeller 2 in the opposite direction to the rotation of the propeller 2, and the curved part 7 forms a hook-shaped blade tip at the end of the guide vane, generating an endplate effect, which improves the rectification efficiency of the energy-saving duct. Compared with a straight guide vane, under the condition of achieving the same pre-spinning effect, the guide vane structure of the present invention has a smaller wetted surface area, which can reduce appendage resistance and improve the energy-saving effect.

[0043] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A marine energy-saving duct, disposed at the stern of the ship and upstream of the propeller, characterized in that, include: The catheter body is an arc shape no larger than a semicircle; A guide vane assembly includes at least three guide vanes, which are spaced apart along the arc direction of the duct body and connected to the duct body respectively; the root of one guide vane is fixedly connected to the outer plate of the stern of the hull, and the top of the guide vane is connected to the duct body; the other two guide vanes include a straight portion and a curved portion, the root of the straight portion is connected to the outer plate of the stern of the hull, the top of the straight portion extends radially out of the duct body, and the curved portion is connected to the top of the straight portion and bends toward one side of the guide vane.

2. The ship energy-saving duct according to claim 1, characterized in that, Along the arc direction of the catheter body, two of the three guide vanes are located at both ends of the arc direction of the catheter body, and the third guide vane is located between the two guide vanes.

3. The ship energy-saving duct according to claim 1, characterized in that, The cross-section of all three guide vanes is airfoil-shaped, and each guide vane has a first side and a second side facing away from each other along its thickness direction. The first side is a plane, and the second side is a curved or arc-shaped surface.

4. The ship energy-saving duct according to claim 3, characterized in that, The curved portion bends toward the first or second side of the guide vane, and the angle between the end face of the curved portion and the first side is 2°-20°.

5. The ship energy-saving duct according to claim 1, characterized in that, Along the radial direction of the duct body, the distance between the top of the straight portion and the root is 0.7-0.9 times the propeller radius.

6. The ship energy-saving duct according to claim 1, characterized in that, Along the radial direction of the conduit body, the distance between the end of the curved portion and the top of the straight portion is 0.05-0.45 times the propeller radius.

7. The ship energy-saving duct according to claim 1, characterized in that, The three guide vanes are a first guide vane, a second guide vane, and a third guide vane. Along the arc direction of the catheter body, the second guide vane is located between the first guide vane and the third guide vane. The second and third guide vanes have the curved portion. The length of the second and third guide vanes is greater than the arc radius of the catheter body. The length of the first guide vane is less than the arc radius of the catheter body, and the top of the first guide vane is connected to the catheter body.

8. The ship energy-saving duct according to claim 7, characterized in that, Along the arc direction of the catheter body, the included angle between the second guide vane and the third guide vane is smaller than the included angle between the second guide vane and the first guide vane.

9. The ship energy-saving duct according to claim 1, characterized in that, The three guide vanes are a first guide vane, a second guide vane, and a third guide vane. Along the arc direction of the catheter body, the second guide vane is located between the first guide vane and the third guide vane. The first guide vane and the third guide vane have the curved portion. The length of the first guide vane and the third guide vane is greater than the arc radius of the catheter body. The length of the second guide vane is less than the arc radius of the catheter body. The top of the second guide vane is connected to the catheter body.

10. A ship, characterized in that, Includes the ship energy-saving duct as described in any one of claims 1-9.

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