Flow guiding device of ship propeller and ship

Abstract

The invention provides a flow guiding device of a ship propeller and a ship. The flow guide device comprises a plurality of guide vanes, the guide vanes are fixedly connected to the stern of the ship in the circumferential direction of the propeller, and the guide vanes are arranged at different positions in the axial direction of the propeller. The guide vanes are arranged at different positions in the axial direction of the propeller, so that the stress borne by the flow guide device is reduced; by limiting the circumferential length of flow guide, the resistance borne by the flow guide device can be reduced on the premise that the stability of the structure is improved. The ship stern and the flow field around the propeller are improved, the propelling efficiency of the propeller is improved, and the pressure at the blade backs of the propeller blades can be increased, so that the stress of the propeller is increased, and the thrust component is increased accordingly; the flow field pressure at the guide vanes outside the guide wheel can be reduced, so that the flow velocity of the flow field is increased, and the propeller efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of ship energy-saving design, and in particular to a flow guide device for a ship propeller and a ship. Background Art

[0002] With the development of modern industry and technology, the problem of global warming has become increasingly prominent and has gradually evolved into one of the major problems facing mankind. In the field of shipping, in order to reduce the impact of shipping emissions on global warming, the International Maritime Organization has developed an energy efficiency design index calculation method to constrain greenhouse gas emissions from ships.

[0003] At present, the main measures for reducing carbon emissions in ships include line optimization, new energy power, and hydrodynamic energy-saving device attachments. The hydrodynamic energy-saving device improves the propeller efficiency by rectifying and pre-spinning the flow field at the stern of the ship to achieve the purpose of energy conservation and emission reduction. The hydrodynamic energy-saving device has the advantages of simple installation, low cost, and convenient maintenance. For large, low-speed shipping ships, the energy-saving effect of this type of energy-saving device is more significant. Therefore, a large proportion of large ships currently in operation are equipped with hydrodynamic energy-saving devices.

[0004] The propeller front energy-saving device is a form of hydrodynamic energy-saving device, which includes a stator and a duct for fixing the stator, so as to improve the problems of uneven flow field at the stern of the ship and large energy dissipation of the propeller, thereby improving the propeller propulsion efficiency.

[0005] In the current propeller-front energy-saving device, multiple stators and ducts are arranged on the same positioning plane perpendicular to the incoming flow direction. However, this arrangement does not take into account the different flow field characteristics at different positions at the stern of the ship, and there is room for improvement.

[0006] In summary, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0007] The purpose of the embodiments of the present application is to provide a flow guide device for a ship propeller and a ship, which can fully utilize the structural strength and achieve good energy-saving effects.

[0008] In a first aspect, a flow guide device for a ship propeller is provided, comprising a plurality of guide vanes, wherein the plurality of guide vanes are fixedly connected to the stern of the ship around the circumference of the propeller, and a vertical plane where the propeller axis is located is defined as a first positioning plane; the guide vanes comprise a side guide vane and a side guide vane; the a side guide vane and the b side guide vane are respectively arranged on both sides of the first positioning plane in an asymmetrical manner.

[0009] In one practicable manner, the number of the guide vanes on the a-side and the number of the guide vanes on the b-side are different, and the number of the guide vanes on the a-side and the number of the guide vanes on the b-side are determined according to the rotation direction of the propeller shaft.

[0010] In one practicable manner, the guide vanes on the a-side and the guide vanes on the b-side are different in length, and the lengths of the guide vanes on the a-side and the guide vanes on the b-side are determined according to the rotation direction of the propeller shaft.

[0011] In an operative manner, the included angles between the plurality of a-side guide vanes and the first positioning surface are different from the included angles between the plurality of b-side guide vanes and the first positioning surface.

[0012] In an operative manner, the guide vane on the a side at least includes a first guide vane on the a side and an edge guide vane on the a side; the guide vane on the b side at least includes an edge guide vane on the b side; the angle between the first guide vane on the a side and the first positioning surface is 10-30°, and the angle between the first guide vane on the a side and the edge guide vane on the a side is 20-45°;

[0013] The included angle between the b-side edge guide vane and the first positioning surface is 20-90°.

[0014] In one practicable manner, the positions of the plurality of guide vanes in the axial direction of the propeller are exactly the same, partially the same, or completely different, that is, the plane where the propeller disk is located is defined as a second positioning surface, and the distance between each guide vane and the second positioning surface is exactly the same, partially the same, or completely different.

[0015] In an operative manner, the guide vanes on the a-side include at least a first guide vane on the a-side, a second guide vane on the a-side, a third guide vane on the a-side, and an edge guide vane on the a-side; and the guide vanes on the b-side include at least an edge guide vane on the b-side.

[0016] In an operative manner, when the positions of the plurality of guide vanes in the axial direction of the propeller are partially the same, the distances between the first guide vane on the a side and the third guide vane on the a side and the second positioning surface are respectively D1, the distances between the edge guide vane on the b side, the second guide vane on the a side, and the edge guide vane on the a side and the second positioning surface are respectively D2, and D1 is greater than D2; the distance between the first guide vane on the a side and the edge guide vane on the b side is 0-0.03 times the radius of the propeller.

[0017] In one practicable manner, when the positions of the plurality of guide vanes in the axial direction of the propeller are partially the same, the distances between the edge guide vane on the b side, the first guide vane on the a side, the second guide vane on the a side and the second positioning surface increase sequentially, and the distances between the second guide vane on the a side, the third guide vane on the a side, the edge guide vane on the a side and the second positioning surface are the same; the distance between the first guide vane on the a side and the edge guide vane on the b side is greater than the distance between the first guide vane on the a side and the second guide vane on the a side; the distance between the first guide vane on the a side and the edge guide vane on the b side is 0-0.03 times the radius of the propeller.

[0018] In an operative manner, when the positions of the plurality of guide vanes in the axial direction of the propeller are partially the same, the distances between the edge guide vane on side b, the first guide vane on side a, the second guide vane on side a, the third guide vane on side a, the edge guide vane on side a and the second positioning surface are first increased or decreased; wherein, the distance between the third guide vane on side a and the edge guide vane on side a is 0-0.04 times the propeller radius, the distance between the first guide vane on side a and the second guide vane on side a is 0-0.02 times the propeller radius, and the distance between the third guide vane on side a and the edge guide vane on side a is greater than the distance between the first guide vane on side a and the second guide vane on side a.

[0019] In one practicable manner, when the positions of the plurality of guide vanes in the axial direction of the propeller are partially the same, the distances between the first guide vane on the a side, the second guide vane on the a side, the third guide vane on the a side, the edge guide vane on the a side and the second positioning surface are the same and are greater than the distance between the edge guide vane on the b side and the second positioning surface, and the distance between the edge guide vane on the b side and the first guide vane on the a side is 0-0.05 times the radius of the propeller.

[0020] In one practicable manner, when the positions of the plurality of guide vanes in the axial direction of the propeller are completely different, the distances between the edge guide vane on side b, the first guide vane on side a, the second guide vane on side a, the third guide vane on side a, the edge guide vane on side a and the second positioning surface increase sequentially, the distance between the third guide vane on side a and the edge guide vane on side a is 0-0.01 times the propeller radius, the distance between the second guide vane on side a and the third guide vane on side a is 0-0.015 times the propeller radius, the distance between the first guide vane on side a and the second guide vane on side a is 0-0.02 times the propeller radius, and the distance between the edge guide vane on side b and the first guide vane on side a is 0-0.03 times the propeller radius; along the direction from side b to side a, the spacing between two adjacent guide vanes decreases sequentially.

[0021] In one practicable manner, a first guide wheel is connected to the plurality of the a-side guide vanes, and the first guide wheel connects the plurality of a-side guide vanes into an integrated structure; a second guide wheel is arranged on the b-side guide vane, and the second guide wheel connects the b-side guide vane with the a-side guide vane.

[0022] In one practicable manner, the first guide wheel and the second guide wheel are both arranged in an arc shape, and multiple a-side guide vanes are connected into a fan-shaped structure through the first guide wheel, and the b-side guide vanes are connected into a fan-shaped structure through the second guide wheel.

[0023] In an operative manner, one end of the second guide wheel is fixedly connected to the guide vane on the a-side, and the other end of the second guide wheel is fixedly connected to the edge guide vane on the b-side.

[0024] In one practicable manner, one end of the second guide wheel is fixedly connected to the guide vane on the a-side, and the other end of the second guide wheel is sequentially connected to multiple guide vanes on the b-side, and then the other end of the second guide wheel continues to extend and is suspended.

[0025] In one practicable manner, one end of the second guide wheel is fixedly connected to the a-side guide vane, and the other end of the second guide wheel is sequentially connected to multiple b-side guide vanes, and then the other end of the second guide wheel continues to extend and is fixedly connected to the ship structure.

[0026] In an operative manner, one end of the first guide wheel is fixedly connected to the guide vane on the a-side, and the other end of the first guide wheel is fixedly connected to the edge guide vane on the a-side.

[0027] In an operative manner, one end of the first guide wheel is fixedly connected to the guide vane on the a-side, and after the other end of the first guide wheel is sequentially connected to a plurality of guide vanes on the a-side, the other end of the first guide wheel continues to extend and is suspended.

[0028] In one practicable manner, one end of the first guide wheel is fixedly connected to the a-side guide vane, and after the other end of the first guide wheel is sequentially connected to multiple a-side guide vanes, the other end of the first guide wheel continues to extend and is fixedly connected to the ship structure.

[0029] In one practicable manner, the cross-sectional shape of the first guide wheel and the cross-sectional shape of the second guide wheel at least include circular, trapezoidal, wing-shaped, rectangular, elliptical, and diamond-shaped.

[0030] In an operative manner, the guide vane includes an end portion and a root portion, wherein the root portion is fixedly connected to the hull structure, the end portion extends radially outward, and the guide wheel is disposed between the end portion and the root portion.

[0031] In an practicable manner, the end and the root of the guide vane are respectively rotated at a predetermined angle, so that a plurality of cross sections in the length direction of the guide vane are configured with a predetermined incoming flow attack angle.

[0032] In an practicable manner, the incoming flow attack angle includes at least a twist angle and a deflection angle;

[0033] The end and the root of the guide vane rotate in the same direction by a first predetermined angle, which is a deflection angle; the end of the guide vane rotates alone by a second predetermined angle, which is a torsion angle.

[0034] In an operative manner, the deflection angle ranges from 4 to 16°, and the torsion angle ranges from 0 to 10°.

[0035] In an operative manner, the end of each guide vane is a free end, and an end plate is provided at the end of the guide vane.

[0036] In an operative manner, the shape of the end plate includes at least a rectangle, a disc, a triangle, an elliptical disc, and an ellipsoid.

[0037] According to a second aspect of the present application, there is also provided a ship, comprising a propeller, wherein the flow guiding device provided in the first aspect is arranged in the incoming flow direction of the propeller.

[0038] Compared with the prior art, the beneficial effects of this application are:

[0039] In the technical solution of the present application, the stress on the guide device is reduced by arranging the guide vanes at different positions along the propeller axis; by limiting the circumferential length of the guide vane, the resistance on the guide device can be reduced while ensuring the stability of the structure. The present application improves the flow field around the stern of the ship and the propeller, improves the propulsion efficiency of the propeller, and can increase the back pressure of the propeller blades, so that the propeller thrust component increases accordingly; it can improve the flow separation at the stern, increase the flow field velocity within the range of action of the guide wheel, and improve the propeller efficiency. The structural arrangement provided in the present application can be more consistent with the flow fields at various locations at the stern, thereby improving the overall energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a left side view of the flow guide device of the ship propeller according to the embodiment of the present invention.

[0041] Figure 2 It is a front view of a flow guide device for a ship propeller according to an embodiment of the present invention.

[0042] Figure 3 It is a schematic diagram of the three-dimensional structure of a flow guide device for a ship propeller according to an embodiment of the present invention.

[0043] Figure 4 It is a top view of a first arrangement scheme of guide vanes in a flow guide device for a ship propeller according to an embodiment of the present invention.

[0044] Figure 5 It is a top view of a second arrangement scheme of guide vanes in the guide device of a ship propeller according to an embodiment of the present invention.

[0045] Figure 6 It is a top view of a third arrangement scheme of guide vanes in the guide device of a ship propeller according to an embodiment of the present invention.

[0046] Figure 7 It is a top view of a fourth arrangement scheme of guide vanes in the guide device of a ship propeller according to an embodiment of the present invention.

[0047] Figure 8 It is a top view of a fifth arrangement scheme of guide vanes in the guide device of a ship propeller according to an embodiment of the present invention.

[0048] Fig. 9 It is a front view of a first arrangement scheme of guide vanes in a flow guide device for a ship propeller according to an embodiment of the present invention.

[0049] Fig.10 It is a front view of a second arrangement scheme of guide vanes in the guide device of a ship propeller according to an embodiment of the present invention.

[0050] Fig.11 It is a front view of a third arrangement scheme of guide vanes in the guide device of a ship propeller according to an embodiment of the present invention.

[0051] Fig.12 It is a front view of a fourth arrangement scheme of guide vanes in the guide device of a ship propeller according to an embodiment of the present invention.

[0052] Fig.13 It is a front view of a fifth arrangement scheme of guide vanes in the guide device of a ship propeller according to an embodiment of the present invention.

[0053] Fig.14 It is a schematic diagram of the incoming flow attack angle of the guide vane in the guide device of the ship propeller according to an embodiment of the present invention.

[0054] Fig.15 It is a schematic longitudinal section diagram of a guide vane in a flow guide device for a ship propeller according to an embodiment of the present invention.

[0055] Fig.16 The present invention is a schematic structural diagram of an end plate in a flow guide device for a ship propeller according to an embodiment of the present invention.

[0056] Fig.17 This is another structural schematic diagram of the end plate in the guide device of the ship propeller according to an embodiment of the present invention.

[0057] Fig.18 This is another structural schematic diagram of the end plate in the guide device of the ship propeller according to the embodiment of the present invention.

[0058] Fig.19 The present invention is a schematic diagram of a connection structure between an end plate and a guide vane in a flow guide device of a ship propeller according to an embodiment of the present invention.

[0059] Fig. 20 The present invention is a schematic diagram of another connection structure between the end plate and the guide vane in the guide device of the ship propeller according to an embodiment of the present invention.

[0060] Fig.21 It is a schematic diagram of a characteristic cross section of a guide wheel in a flow guide device for a ship propeller according to an embodiment of the present invention.

[0061] Fig. 22 The present invention is a schematic diagram of the arrangement of a guide wheel in a flow guide device for a ship propeller according to an embodiment of the present invention.

[0062] Fig.23The present invention is another schematic diagram of another arrangement of a guide wheel in a guide device for a ship propeller according to another embodiment of the present invention.

[0063] Fig.24 It is a schematic diagram of the longitudinal inclination angle in the flow guide device of the ship propeller according to the embodiment of the present invention.

[0064] Fig.25 It is a schematic diagram of the position of the center of a circle of a guide vane, a guide wheel and a propeller in a flow guide device of a ship propeller according to an embodiment of the present invention.

[0065] Fig.26 It is a cloud diagram of the pressure distribution around the propeller in the prior art.

[0066] Fig. 27 It is a cloud diagram of pressure distribution around a propeller in a flow guide device for a ship propeller according to an embodiment of the present invention.

[0067] The reference numerals are as follows:

[0068] 1. Hull structure; 2. First guide wheel; 3. Second guide wheel; 4. First guide vane on side a; 5. Second guide vane on side a; 6. Third guide vane on side a; 7. Edge guide vane on side a; 8. Edge guide vane on side b; 9. End plate; 10. First positioning surface; 11. Propeller shaft; 12. Second positioning surface. DETAILED DESCRIPTION

[0069] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0070] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0071] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0073] According to the first aspect of the present application, see Figures 1 to 25 First, a guide device for a ship propeller is provided, which is coaxially arranged in the incoming flow direction of the propeller shaft 11 of the ship propeller, and includes a plurality of guide vanes, which are fixedly connected to the stern of the ship around the circumference of the propeller, and the vertical plane where the propeller axis is located is defined as a first positioning surface 10; the guide vanes include a side guide vanes and b side guide vanes; the a side guide vanes and the b side guide vanes are respectively arranged on both sides of the first positioning surface 10 in an asymmetric manner. Considering that the distribution of the flow field around the propeller is different on the left and right sides, therefore, by arranging the a side guide vanes and the b side guide vanes on both sides of the first positioning surface 10 in an asymmetric manner, and determining the arrangement of the a side guide vanes and the b side guide vanes according to the rotation direction of the propeller, the energy saving effect can be improved.

[0074] In this embodiment, the first positioning surface 10 divides the ship into port and starboard, the guide vane on the a side is arranged on the port side, and the guide vane on the b side is arranged on the starboard side. Figures 1 to 3 As shown, during the rotation of the propeller, the left and right sides of the propeller root flow field are different. The root flow field on the right side is unfavorable to the propeller efficiency, and the flow field on the left side is unfavorable to the propeller efficiency as a whole.

[0075] In an operative manner, the number of the guide vanes on the a side is different from the number of the guide vanes on the b side, and the number of the guide vanes on the a side is determined according to the rotation direction of the propeller shaft. In this embodiment, the number of the guide vanes on the a side is greater than the number of the guide vanes on the b side.

[0076] In an operative manner, the guide vane on the a side and the guide vane on the b side have different lengths, and the lengths of the guide vane on the a side and the guide vane on the b side are determined according to the rotation direction of the propeller shaft. In this embodiment, the length of the guide vane on the a side is greater than the length of the guide vane on the b side.

[0077] In an practicable manner, the included angles between the plurality of a-side guide vanes and the first positioning surface 10 are different from the included angles between the plurality of b-side guide vanes and the first positioning surface 10 .

[0078] Specifically, in this embodiment, the guide vanes on the a side include the first guide vanes 4 on the a side, the second guide vanes 5 on the a side, the third guide vanes 6 on the a side, and the edge guide vanes 7 on the a side, and the guide vanes on the b side include the first guide vanes on the b side, the second guide vanes on the b side, and the edge guide vanes 8 on the b side. The angle between the first guide vane 4 on the a side and the first positioning surface 10 is 10-30°, and the angle between two adjacent guide vanes on the a side is 20-45°. The angle between the edge guide vane 8 on the b side and the first positioning surface 10 is 20-90°, and the angle between two adjacent guide vanes on the b side is 20-45°. By limiting the angle between the guide vanes, the cascade effect caused by the dense distribution of the guide vanes is avoided, thereby avoiding a significant increase in resistance and ensuring the energy-saving flow guidance effect.

[0079] It should be noted that when the rotation direction of the propeller changes, those skilled in the art can make the following adjustments according to the specific situation: the number of guide vanes on the a side is less than the number of guide vanes on the b side, and the length of the guide vane on the a side is less than the length of the guide vane on the b side. The angle between the first guide vane on the b side and the first positioning surface 10 is 10-30°, and the angle between two adjacent guide vanes on the b side is 20-45°. The angle between the edge guide vane on the a side and the first positioning surface 10 is 20-90°, and the angle between two adjacent guide vanes on the a side is 20-45°.

[0080] In an operative manner, the positions of the plurality of guide vanes in the axial direction of the propeller are completely the same, partially the same, or completely different, that is: Figure 2 As shown, the plane where the propeller disk is located is defined as the second positioning surface 12, and the distance between each guide vane and the second positioning surface 12 is completely the same, partially the same, or completely different. By arranging a plurality of guide vanes at different positions of the propeller axial direction, the force of the water flow on the guide wheel during the operation of the ship is not on the same plane, thereby reducing the stress on the guide device and assisting in enhancing the energy-saving effect of the guide device.

[0081] It should be noted that the distance between the guide vane and the second positioning surface 12 is the distance between the center line of the guide vane and the second positioning surface 12. Since the high-speed rotation of the propeller will have an exciting force on the energy-saving device, the larger the distance between the guide vane and the second positioning surface 12, the smaller the exciting force, and thus the smaller the structural strength requirement of the present application. However, when the distance is too large, the water flow gradually no longer has pre-swirl, which will lead to a poor energy-saving effect. Therefore, the present application designs the distance between multiple guide vanes and the second positioning surface 12.

[0082] In this embodiment, Figures 1 to 3 As shown, the guide vanes on the a-side include the first guide vanes 4 on the a-side, the second guide vanes 5 on the a-side, the third guide vanes 6 on the a-side, and the edge guide vanes 7 on the a-side, and the guide vanes on the b-side include the edge guide vanes 8 on the b-side.

[0083] Specifically, the distances between the guide vanes and the second positioning surface 12 include the following:

[0084] When the positions of the plurality of guide vanes in the axial direction of the propeller are partially the same, Figure 4 and Fig. 9 As shown, the distance between the first guide vane 4 on the a side, the third guide vane 6 on the a side and the second positioning surface 12 is D1, the distance between the edge guide vane 8 on the b side, the second guide vane 5 on the a side, and the edge guide vane 7 on the a side and the second positioning surface 12 is D2, and D1 is greater than D2. The distance between the first guide vane 4 on the a side and the edge guide vane 8 on the b side is 0-0.03 times the propeller radius.

[0085] When the positions of the plurality of guide vanes in the axial direction of the propeller are partially the same, Figure 5 and Fig.10 As shown, the distances between the b-side edge guide vane 8, the a-side first guide vane 4, the a-side second guide vane 5 and the second positioning surface 12 increase in sequence, and the distances between the a-side second guide vane 5, the a-side third guide vane 6, the a-side edge guide vane 7 and the second positioning surface 12 are the same. The distance between the a-side first guide vane 4 and the b-side edge guide vane 8 is greater than the distance between the a-side first guide vane 4 and the a-side second guide vane 5. The distance between the a-side first guide vane 4 and the b-side edge guide vane 8 is 0-0.03 times the propeller radius.

[0086] When the positions of the plurality of guide vanes in the axial direction of the propeller are partially the same, Figure 6 and Fig.11 As shown, the distances between the edge guide vane 8 on the b side, the first guide vane 4 on the a side, the second guide vane 5 on the a side, the third guide vane 6 on the a side, the edge guide vane 7 on the a side and the second positioning surface 12 increase or decrease first. Among them, the distance between the third guide vane 6 on the a side and the edge guide vane 7 on the a side is 0-0.04 times the propeller radius, the distance between the first guide vane 4 on the a side and the second guide vane 5 on the a side is 0-0.02 times the propeller radius, and the distance between the third guide vane 6 on the a side and the edge guide vane 7 on the a side is greater than the distance between the first guide vane 4 on the a side and the second guide vane 5 on the a side.

[0087] When the positions of the plurality of guide vanes in the axial direction of the propeller are partially the same, Figure 7 and Fig.12 As shown, the distances between the first guide vane 4 on the a side, the second guide vane 5 on the a side, the third guide vane 6 on the a side, the edge guide vane 7 on the a side and the second positioning surface 12 are the same, and are greater than the distance between the edge guide vane 8 on the b side and the second positioning surface 12, and the distance between the edge guide vane 8 on the b side and the first guide vane 4 on the a side is 0-0.05 times the propeller radius.

[0088] When the positions of the plurality of guide vanes in the axial direction of the propeller are completely different, such as Figure 8 and Fig.13As shown, the distances between the edge guide vane 8 on the b side, the first guide vane 4 on the a side, the second guide vane 5 on the a side, the third guide vane 6 on the a side, the edge guide vane 7 on the a side and the second positioning surface 12 increase in sequence, the distance between the third guide vane 6 on the a side and the edge guide vane 7 on the a side is 0-0.01 times the propeller radius, the distance between the second guide vane on the a side and the third guide vane 6 on the a side is 0-0.015 times the propeller radius, the distance between the first guide vane 4 on the a side and the second guide vane 5 on the a side is 0-0.02 times the propeller radius, and the distance between the edge guide vane 8 on the b side and the first guide vane 4 on the a side is 0-0.03 times the propeller radius. In the direction from the b side to the a side, the spacing between two adjacent guide vanes decreases in sequence.

[0089] It should also be noted that, in the various arrangements of the guide vanes, the distance between the a-side edge guide vane 7 and the second positioning surface 12 is 0.2-0.4 times the propeller radius.

[0090] In one practicable manner, a first guide wheel 2 is connected to the a-side guide vane, and the first guide wheel 2 connects multiple a-side guide vanes. A second guide wheel 3 is arranged on the b-side guide vane, and the second guide wheel 3 connects the b-side guide vane with the a-side guide vane.

[0091] It should be noted that if Figures 1 to 3 As shown, the guide vanes on the a side include the first guide vanes 4 on the a side, the second guide vanes 5 on the a side, the third guide vanes 6 on the a side, and the edge guide vanes 7 on the a side, and the guide vanes on the b side include the edge guide vanes on the b side 8. The first guide wheel 2 and the second guide wheel 3 are both arranged in an arc shape, and the plurality of guide vanes on the a side are connected into a fan-shaped structure through the first guide wheel 2, and the guide vanes on the b side are connected into a fan-shaped structure through the second guide wheel 3.

[0092] It should also be noted that if Fig.23 As shown, the guide vanes include a first guide vane 4 on the a side, a second guide vane 5 on the a side, and an edge guide vane 8 on the b side. The first guide vane 4 on the a side and the second guide vane 5 on the a side are connected through a first guide wheel 1, and the first guide vane 4 on the a side and the edge guide vane 8 on the b side are connected through a second guide wheel 3. In addition, the radius of the second guide wheel 3 is smaller than the radius of the first guide wheel 2.

[0093] In an operative manner of the second guide wheel, one end of the second guide wheel 3 is fixedly connected to the guide vane on the a-side, and the other end of the second guide wheel 3 is fixedly connected to the edge guide vane on the b-side.

[0094] In another practicable manner of the second guide wheel, as Fig. 22 As shown, one end of the second guide wheel 3 is fixedly connected to the guide vane on the a side, and the other end of the second guide wheel 3 is sequentially connected to multiple guide vanes on the b side, and then the other end of the second guide wheel 3 continues to extend and is suspended.

[0095] In another practicable manner of the second guide wheel, as Fig. 22As shown, one end of the second guide wheel 3 is fixedly connected to the a-side guide vane, and the other end of the second guide wheel 3 is sequentially connected to multiple b-side guide vanes, and then the other end of the second guide wheel 3 continues to extend and is fixedly connected to the ship structure to enhance the stability and structural strength of the structure of the present application.

[0096] In an operative manner of the first guide wheel, one end of the first guide wheel 2 is fixedly connected to the guide vane on the a-side, and the other end of the first guide wheel 2 is fixedly connected to the edge guide vane on the a-side.

[0097] In another practicable manner of the first guide wheel, one end of the first guide wheel 2 is fixedly connected to the a-side guide vane, and after the other end of the first guide wheel 2 is sequentially connected to multiple a-side guide vanes, the other end of the first guide wheel 2 continues to extend and is suspended.

[0098] In another practicable manner of the first guide wheel, one end of the first guide wheel 2 is fixedly connected to the a-side guide vane, and after the other end of the first guide wheel 2 is sequentially connected to a plurality of a-side guide vanes, the other end of the first guide wheel 2 continues to extend and is fixedly connected to the ship structure. In an practicable manner, the shapes of the characteristic cross-sections of the first guide wheel 2 and the second guide wheel 3 include at least a circle, a trapezoid, a wing, a rectangle, an ellipse, and a rhombus.

[0099] When the characteristic cross-sectional shape of the first guide wheel 2 and the second guide wheel 3 is circular, the cross-sectional radius is 0.35-0.75 times the propeller radius.

[0100] like Fig.21 As shown, when the characteristic cross-sectional shape of the first guide wheel 2 and the second guide wheel 3 is a trapezoid, that is, the side of the first guide wheel 2 or the second guide wheel 3 close to the propeller is the inlet side, and the side of the first guide wheel 2 or the second guide wheel 3 away from the propeller is the outlet side, and the radius of the outlet side is 0.8-1 times the radius of the inlet side. The radius of the inlet side of the guide wheel is larger than the radius of the outlet side, which can accelerate the flow field behind the guide wheel and increase the thrust generated by the propeller.

[0101] In an operative manner, the guide vane comprises an end and a root, the root being used for fixed connection with the hull structure 1, the end extending radially outward, and the end being a free end. The guide wheel is arranged between the end and the root. The end and the root of the guide vane are respectively rotated at a predetermined angle so that each cross section in the length direction of the guide vane is configured with a predetermined incoming flow attack angle, such as Fig.14 As shown, the incoming flow attack angle is defined as the angle between the center line of the guide vane and the incoming flow schematic line. The incoming flow attack angle is used to form a pre-swirl flow in the opposite direction of the propeller rotation.

[0102] In one practicable manner, if Fig.14As shown, the incoming flow angle of attack includes at least a deflection angle β and a torsion angle γ. The end and the root of the guide vane are rotated in the same direction by a first predetermined angle, the first predetermined angle being the deflection angle β; the end of the guide vane is rotated separately by a second predetermined angle, the second predetermined angle being the torsion angle γ. By combining the torsion angle γ and the deflection angle β, each section in the length direction of the guide vane is configured with a predetermined incoming flow angle of attack, which can increase the angle range of the guide vane in the radial direction of the propeller, and can adjust the incoming flow angle of attack according to different ship types to prevent the deterioration of hydrodynamic performance caused by stall, so as to ensure that the present application has the optimal guide and energy-saving effect. By setting the torsion angle γ, the line segment connecting the midpoints of the chord lines of different sections on the same guide vane is a spiral line, so that each section of the guide vane along the length direction has a different torsion angle γ to adapt to different flow field conditions.

[0103] Specifically, the deflection angle β is in the range of 4-16°, and the torsion angle γ is in the range of 0-10°. Under normal circumstances, the deflection angle β and the torsion angle γ take positive values, but in the case of deterioration of hydrodynamic performance, the angles of the deflection angle β and the torsion angle γ can be reduced or taken as negative values. It should be noted that the cross-sectional midline of the end and the cross-sectional midline of the root are both arranged along the axial direction of the propeller.

[0104] It should also be noted that the cross-sectional shape of the guide vane is an airfoil shape, that is, the width of the cross-sectional shape of the guide vane decreases in sequence from the top of the leading edge of the cross-sectional shape to the top of the trailing edge of the cross-sectional shape along the propeller axis. The present application can also set the end cross-sectional shape and the root cross-sectional shape of the guide vane to different shapes or sizes, so as to further cope with different stern flow field characteristics.

[0105] Specifically, Fig.15 As shown, the length of the cross-sectional midline of the end portion is 0.5-1 times the length of the cross-sectional midline of the root portion.

[0106] In one practicable manner, if Figures 1 to 3 As shown, each guide vane is provided with an end plate 9 at its end. By providing the end plate 9, the three-dimensional effect of the guide vane end can be weakened, the circulation of the guide vane can be increased, that is, the pre-swirl effect of the guide vane can be improved.

[0107] It should be noted that if Figures 16 to 18 As shown, the cross-sectional shape of the end plate 9 at least includes a rectangle, a disc, a triangle, an elliptical disc, and an ellipsoid.

[0108] It should be noted that the elliptical sheet shape is the optimal shape of the end plate 9, considering that sharp edges generally have an adverse effect on the flow field, and the elliptical sheet shape can also play a good role in guiding the flow.

[0109] It should also be noted that the center line of the end plate 9 is set corresponding to the end surface center line of the guide vane on the a side or the guide vane on the b side, or the center line of the end plate 9 is set offset from the end surface center line of the guide vane on the a side or the guide vane on the b side, such as Fig.19 and Fig. 20 shown.

[0110] In an practicable manner, the center A of the first guide wheel 2, the center B of the second guide wheel 3, the axis C of the propeller, and the intersection D of the reverse extension lines of the plurality of guide vanes can be arranged at different positions, such as Fig.25 shown.

[0111] In one practicable manner, if Fig.24 As shown, the guide device provided by the present application is arranged to be tilted toward the stern of the ship as a whole, that is, the longitudinal inclination angle α of the device is -5 to 15°.

[0112] According to a second aspect of the present application, there is also provided a ship, comprising a propeller, wherein the flow guiding device provided in the first aspect is arranged in the incoming flow direction of the propeller.

[0113] In summary, if Fig.26 and Fig. 27 As shown, the present application provides a guide device for a ship propeller and a ship. By arranging the guide vanes at different positions of the propeller axis, the stress on the guide device is reduced; by limiting the circumferential length of the guide wheel, the resistance on the guide device can be reduced while improving the stability of the structure. The present application improves the flow field around the stern of the ship and the propeller, improves the propulsion efficiency of the propeller, and can increase the pressure on the back of the propeller blades to increase the force on the propeller, thereby increasing the thrust component; it can reduce the flow field pressure at the guide vanes on the outside of the guide wheel, thereby increasing the flow field velocity and improving the propeller efficiency. The energy saving effect of the present application can reach 2-5%.

[0114] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A flow guide device for a ship propeller, characterized in that: It comprises a plurality of guide vanes, which are fixedly connected to the stern of the ship around the circumference of the propeller, and the vertical plane where the propeller axis is located is defined as the first positioning plane; the guide vanes comprise a side guide vane and a side guide vane; the a side guide vane and the b side guide vane are respectively arranged on both sides of the first positioning plane in an asymmetrical manner.

2. The flow guide device for a ship propeller according to claim 1, characterized in that: The number of the guide vanes on the a side and the guide vanes on the b side are different, and the number of the guide vanes on the a side and the guide vanes on the b side is determined according to the rotation direction of the propeller shaft.

3. The flow guide device for a ship propeller according to claim 1, characterized in that: The guide vanes on the a side and the guide vanes on the b side have different lengths, and the lengths of the guide vanes on the a side and the guide vanes on the b side are determined according to the rotation direction of the propeller shaft.

4. The flow guide device for a ship propeller according to claim 1, characterized in that: The included angles between the plurality of a-side guide vanes and the first positioning surface are different from the included angles between the plurality of b-side guide vanes and the first positioning surface.

5. The flow guide device for a ship propeller according to claim 1, characterized in that: The guide vanes on the a side at least include the first guide vanes on the a side and the edge guide vanes on the a side; the guide vanes on the b side at least include the edge guide vanes on the b side; the angle between the first guide vanes on the a side and the first positioning surface is 10-30°, and the angle between the first guide vanes on the a side and the edge guide vanes on the a side is 20-45°; The included angle between the b-side edge guide vane and the first positioning surface is 20-90°.

6. The flow guide device for a ship propeller according to claim 1, characterized in that: The positions of the guide vanes in the axial direction of the propeller are completely identical, partially identical, or completely different, that is, the plane where the propeller disk is located is defined as the second positioning surface, and the distance between each guide vane and the second positioning surface is completely identical, partially identical, or completely different.

7. The flow guide device for a ship propeller according to claim 6, characterized in that: The guide vanes on the a side at least include a first guide vane on the a side, a second guide vane on the a side, a third guide vane on the a side, and an edge guide vane on the a side; the guide vanes on the b side at least include an edge guide vane on the b side.

8. The flow guide device for a ship propeller according to claim 7, characterized in that: When the positions of the plurality of guide vanes in the axial direction of the propeller are partially the same, the distances between the first guide vane on the a side and the third guide vane on the a side and the second positioning surface are respectively D1, the distances between the edge guide vane on the b side, the second guide vane on the a side, and the edge guide vane on the a side and the second positioning surface are respectively D2, and D1 is greater than D2; the distance between the first guide vane on the a side and the edge guide vane on the b side is 0-0.03 times the radius of the propeller.

9. The flow guide device for a ship propeller according to claim 7, characterized in that: When the positions of the plurality of guide vanes in the axial direction of the propeller are partially the same, the distances between the edge guide vane on the b side, the first guide vane on the a side, the second guide vane on the a side and the second positioning surface increase sequentially, and the distances between the second guide vane on the a side, the third guide vane on the a side, the edge guide vane on the a side and the second positioning surface are the same; the distance between the first guide vane on the a side and the edge guide vane on the b side is greater than the distance between the first guide vane on the a side and the second guide vane on the a side; the distance between the first guide vane on the a side and the edge guide vane on the b side is 0-0.03 times the radius of the propeller.

10. The flow guide device for a ship propeller according to claim 7, characterized in that: When the positions of the plurality of guide vanes in the axial direction of the propeller are partially the same, the distances between the edge guide vane on side b, the first guide vane on side a, the second guide vane on side a, the third guide vane on side a, the edge guide vane on side a and the second positioning surface increase or decrease first; wherein, the distance between the third guide vane on side a and the edge guide vane on side a is 0-0.04 times the propeller radius, the distance between the first guide vane on side a and the second guide vane on side a is 0-0.02 times the propeller radius, and the distance between the third guide vane on side a and the edge guide vane on side a is greater than the distance between the first guide vane on side a and the second guide vane on side a.

11. The flow guide device for a ship propeller according to claim 7, characterized in that: When the positions of the plurality of guide vanes in the axial direction of the propeller are partially the same, the distances between the first guide vane on the a side, the second guide vane on the a side, the third guide vane on the a side, the edge guide vane on the a side and the second positioning surface are the same and are greater than the distance between the edge guide vane on the b side and the second positioning surface, and the distance between the edge guide vane on the b side and the first guide vane on the a side is 0-0.05 times the radius of the propeller.

12. The flow guide device for a ship propeller according to claim 7, characterized in that: When the positions of the multiple guide vanes in the axial direction of the propeller are completely different, the distances between the edge guide vane on side b, the first guide vane on side a, the second guide vane on side a, the third guide vane on side a, the edge guide vane on side a and the second positioning surface increase sequentially, the distance between the third guide vane on side a and the edge guide vane on side a is 0-0.01 times the propeller radius, the distance between the second guide vane on side a and the third guide vane on side a is 0-0.015 times the propeller radius, the distance between the first guide vane on side a and the second guide vane on side a is 0-0.02 times the propeller radius, and the distance between the edge guide vane on side b and the first guide vane on side a is 0-0.03 times the propeller radius; along the direction from side b to side a, the spacing between two adjacent guide vanes decreases sequentially.

13. The flow guide device for a ship propeller according to claim 1, characterized in that: A first guide wheel is connected to the multiple a-side guide vanes, and the first guide wheel connects the multiple a-side guide vanes into an integrated structure; a second guide wheel is arranged on the b-side guide vane, and the second guide wheel connects the b-side guide vane with the a-side guide vane.

14. The flow guide device for a ship propeller according to claim 13, characterized in that: The first guide wheel and the second guide wheel are both arranged in an arc shape. The plurality of a-side guide vanes are connected into a fan-shaped structure through the first guide wheel, and the b-side guide vanes are connected into a fan-shaped structure through the second guide wheel.

15. The flow guide device for a ship propeller according to claim 13, characterized in that: One end of the second guide wheel is fixedly connected to the guide vane on the a side, and the other end of the second guide wheel is fixedly connected to the edge guide vane on the b side.

16. The flow guiding device for a ship propeller according to claim 13, characterized in that: One end of the second guide wheel is fixedly connected to the guide vane on the a side, and the other end of the second guide wheel is sequentially connected to multiple guide vanes on the b side, and then the other end of the second guide wheel continues to extend and is suspended.

17. The flow guide device for a ship propeller according to claim 13, characterized in that: One end of the second guide wheel is fixedly connected to the guide vane on the a side, and the other end of the second guide wheel is sequentially connected to multiple guide vanes on the b side, and then the other end of the second guide wheel continues to extend and is fixedly connected to the ship structure.

18. The flow guiding device for a ship propeller according to claim 13, characterized in that: One end of the first guide wheel is fixedly connected to the guide vane on side a, and the other end of the first guide wheel is fixedly connected to the edge guide vane on side a.

19. The flow guiding device for a ship propeller according to claim 13, characterized in that: One end of the first guide wheel is fixedly connected to the guide vane on the a-side, and after the other end of the first guide wheel is sequentially connected to multiple guide vanes on the a-side, the other end of the first guide wheel continues to extend and is suspended.

20. The flow guiding device for a ship propeller according to claim 13, characterized in that: One end of the first guide wheel is fixedly connected to the guide vane on the a side, and the other end of the first guide wheel is sequentially connected to multiple guide vanes on the a side, and then the other end of the first guide wheel continues to extend and is fixedly connected to the ship structure.

21. The flow guiding device for a ship propeller according to claim 13, characterized in that: The cross-sectional shape of the first guide wheel and the cross-sectional shape of the second guide wheel include at least a circle, a trapezoid, a wing, a rectangle, an ellipse, and a diamond.

22. The flow guiding device for a ship propeller according to claim 13, characterized in that: The guide vane comprises an end portion and a root portion, wherein the root portion is fixedly connected to the hull structure, the end portion extends radially outward, and the guide wheel is arranged between the end portion and the root portion.

23. The flow guiding device for a ship propeller according to claim 22, characterized in that: The end and the root of the guide vane are respectively rotated at a predetermined angle so that a plurality of cross sections in the length direction of the guide vane are configured with a predetermined incoming flow attack angle.

24. The flow guiding device for a ship propeller according to claim 23, characterized in that: The incoming flow attack angle at least includes a twist angle and a deflection angle; The end and the root of the guide vane rotate in the same direction by a first predetermined angle, which is a deflection angle; the end of the guide vane rotates alone by a second predetermined angle, which is a torsion angle.

25. The flow guiding device for a ship propeller according to claim 24, characterized in that: The deflection angle ranges from 4 to 16°, and the torsion angle ranges from 0 to 10°.

26. The flow guide device for a ship propeller according to claim 1, characterized in that: The end of each guide vane is a free end, and an end plate is arranged at the end of the guide vane.

27. The flow guiding device for a ship propeller according to claim 26, characterized in that: The shape of the end plate includes at least a rectangle, a disc, a triangle, an elliptical disc, and an ellipsoid.

28. A ship, characterized in that: It comprises a propeller, and a flow guiding device as claimed in any one of claims 1 to 27 is arranged in the incoming flow direction of the propeller.

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