A full-speed trapezoidal flap fin

Abstract

The present application belongs to the technical field of ship anti-roll fin devices, and specifically relates to a full-speed trapezoidal flap fin, including a main wing, a flap and a flap extension plate, the trailing edge of the main wing and the leading edge of the flap are hinged together through a flap shaft, the main wing drives the leading edge of the flap along the center line of the main wing fin shaft to have a predetermined degree of rotational freedom, and the trailing edge of the flap is connected to the leading edge of the flap extension plate; the flap transmission mechanism drives the flap to rotate relative to the main wing along the center line of the flap shaft in the same rotation direction as the main wing based on the rotation direction of the main wing around the center line of the main wing fin shaft. Compared with the existing ship anti-roll fin, the maximum cross-sectional thickness of the trapezoidal flap fin of the present application is reduced by 20% to 35%, the fluid pressure difference resistance of the fin is reduced during high-speed navigation, the flap transmission mechanism and the flap extension plate increase the flap movement sweep area, and improve the fluid lift generated during mooring or low-speed conditions.

Description

Technical Field

[0001] The present invention belongs to the technical field of ship stabilizer fin devices, and more specifically, relates to a full-speed trapezoidal flap fin. Background Art

[0002] Existing conventional stabilizer fins utilize the "wing principle" to generate lift. The fluid lift generated by the fin can be expressed by the following formula:

[0003] ;

[0004] Where: is the density of the fluid medium, is the fluid velocity, is the reference area of the fin, is the lift coefficient of the fin.

[0005] The formula indicates that the fin fluid lift is proportional to the fluid velocity. That is, as the flow velocity decreases, the fluid lift rapidly decreases. When the flow velocity is zero, the fluid lift is also zero, which means that when the ship is in a moored state, the conventional stabilizer fin completely loses its anti-rolling ability according to the "wing principle". In order to enable the stabilizer fin to achieve anti-rolling even in the moored state, in recent years, the "paddle principle" has been adopted. At mooring or low speeds, lift is generated by the active flapping of the fin, expanding the application range of the conventional stabilizer fin and resulting in a full-speed stabilizer fin device. The "paddle principle" makes the magnitude of the lift generated on the fin related to the volume of the fluid space swept in the same direction per unit time. The larger the volume of the fluid space swept in the same direction per unit time, the greater the fluid reaction force generated on the fin, that is, the greater the fluid lift generated by the flapping and the greater the anti-rolling ability.

[0006] Such as Figure 1 、 Figure 2The prior art flap fin stabilizer (i.e., flap fin) shown has a fin divided into a main wing and a flap in a certain proportion. The left side in the figure is the main wing, the right side is the flap, the upper part is the fin tip, and the lower part is the fin root. The distance between the tip end face and the root end face is the fin span. The main wing and the flap are linked by a mechanical hinge. In the shown state, the flap does not swing along the hinge axis connected to the main wing. Section A-A is the central plane of the longitudinal distance between the fin tip and the fin root, and the transverse center line passing through the central plane is the mean chord line of the flap fin. The center line of the drive shaft of the main wing's transmission mechanism and the center line of the rotating shaft of the linkage mechanical hinge between the main wing and the flap are respectively perpendicular to the mean chord line. When the main wing rotates, the transmission mechanism on the flap drives the flap to rotate relative to the main wing simultaneously, generating a relative rotation angle between the main wing and the flap, thus transforming a streamlined fin into a fin with a certain camber and a variable camber. When the lift needs to be increased, the main wing angle and its camber are increased simultaneously. When a large lift is not required, the resistance can be reduced by decreasing the main wing angle and its camber. However, the prior art flap fin still has the following problems: (1) The flap fin is designed with a streamlined arc from the fin tip to the fin root. This streamlined arc design makes the overall thickness of section A-A of the flap fin relatively large, resulting in a large fluid pressure difference resistance of the fin during high-speed navigation. (2) As the aspect ratio of the fin (the ratio of the fin span to the mean chord length) decreases, it will lead to a decrease in the lift curve slope of the fin at high ship speeds, an increase in the stall angle of attack of the fin, and a larger fin angle of attack is required to generate the same lift coefficient. (3) The percentage of the flap area in the total fin area is relatively small (usually less than 25%). The flap rotates relative to the main wing through the drive of the transmission mechanism, and the rotation angle is limited and the flap area is small. Therefore, the area range of the active flapping and sweeping of the fin during berthing or low ship speeds is small, making the anti-rolling ability of the fin limited during berthing or low ship speeds. (4) The flap transmission mechanism of the existing flap fin contains sliding friction pairs, and lubrication is difficult in the underwater environment, with a large friction force, which is an unfavorable factor. Therefore, in order to increase the lift generated by the active flapping of the fin during ship berthing and low speeds and not reduce the lift coefficient of the fin at high speeds, a flap fin applicable to all ship speeds and a flap transmission mechanism without sliding friction pairs that can solve the problems of the prior art are needed to improve the anti-rolling ability of the fin within the full ship speed range and reduce the adverse effects of the sliding friction of the flap transmission mechanism. Summary of the Invention

[0007] In view of the deficiencies of the prior art, the present invention proposes a novel full-speed trapezoidal flap fin. The average chord length of the flap extension plate is 20% - 35% of the total average chord length of the main wing and the flap. With this structure, compared with the existing anti-rolling fins, when the total average chord length is the same, the maximum section thickness of the trapezoidal flap fin is reduced by 20% - 35%, which is beneficial to further reducing the fluid pressure difference resistance of the fin during high-speed navigation. The flap drive mechanism drives the flap to rotate a predetermined angle relative to the main wing along the center line of the flap axis and has a rotational movement in the same direction as the main wing around the center line of the main wing fin axis, increasing the swept area of the flap movement, so that the fin type can generate greater lift generated by active flapping when moored or at low speed conditions; the airfoil of the fin profile jointly composed of the main wing, the flap and the flap extension plate increases the effective camber of the airfoil of the flap fin, so that the fin type has a higher lift coefficient under medium and high speed conditions.

[0008] To achieve the above object, the present invention provides a full-speed trapezoidal flap fin, including a main wing, a flap and a flap extension plate, wherein the flap includes a flap drive mechanism;

[0009] The trailing edge of the main wing is hinged to the leading edge of the flap through a flap axis. The main wing drives the leading edge of the flap to have a rotational freedom of a predetermined angle along the center line of the main wing fin axis. The trailing edge of the flap is connected to the leading edge of the flap extension plate;

[0010] The flap drive mechanism is installed at the leading edge of the flap. Based on the rotation direction of the main wing around the center line of the main wing fin axis, the flap drive mechanism drives the flap to rotate relative to the main wing along the center line of the flap axis in the same rotation direction as the main wing;

[0011] The fin tip of the full-speed trapezoidal flap fin is formed by the upper profile line of the main wing, the upper profile line of the flap and the upper profile line of the flap extension plate, and the fin root of the full-speed trapezoidal flap fin is formed by the lower profile line of the main wing, the lower profile line of the flap and the lower profile line of the flap extension plate;

[0012] The flap extension plate is a flat plate with equal thickness; the section thickness of both the fin root and the fin tip gradually decreases smoothly from the main wing to the flap and then extends to a predetermined length in an equal thickness to the outside of the trailing edge of the flap.

[0013] Further, the average chord length of the flap extension plate is 20% - 35% of the total average chord length of the main wing and the flap. The average chord line is the distance from the midpoint of the leading edge of the main wing to the midpoint of the trailing edge of the flap extension plate.

[0014] Furthermore, fixing plates are provided at the fin root of the flap and the leading edge of the flap. Long round holes are provided on the fixing plates, and the flap transmission mechanism is assembled in the long round holes. The flap transmission mechanism meshes and rotates along the inner profile line trajectory of the long round holes, thereby driving the flap to rotate in the same direction relative to the main wing around the center line of the flap axis.

[0015] Furthermore, the flap transmission mechanism includes a V-shaped guide rail and a V-shaped groove roller; the V-shaped guide rail is fixedly installed in the long round hole, and the outer edge structure thereof matches the inner circle of the long round hole. The rotating shaft of the V-shaped groove roller is externally connected to a support structure.

[0016] Furthermore, the V-shaped groove roller and the V-shaped guide rail form a meshing rolling kinematic pair. The upper and lower edges of the V-shaped groove roller and the V-shaped guide rail are in clearance fit, and the meshing contact between the upper edge or the lower edge of the V-shaped groove roller and the V-shaped guide rail is determined by the direction of the flap rotation torque.

[0017] Furthermore, the center line of the main wing fin axis, the center line of the flap axis, and the center line of the flap transmission shaft are all perpendicular to the mean chord line; the center line of the main wing fin axis is the center line of the fin axis of the externally connected fin-rotating actuator of the main wing, and the center line of the flap transmission shaft is the center line of the rotating shaft of the support structure externally connected to the V-shaped groove roller.

[0018] Furthermore, when the main wing rotates, the relative rolling range of the rolling motion amplitude between the V-shaped groove roller and the V-shaped guide rail is determined based on the relative position relationship among the center line of the main wing fin axis, the center line of the flap axis, and the center line of the flap transmission shaft, which are parallel to each other, and the rotation angle range of the fin axis of the main wing.

[0019] Furthermore, the full-speed trapezoidal flap fin further includes a fairing, a middle flap reinforcement plate, a flap root end plate, and a flap tip end plate; the fairing is a sheet structure, including a main wing sheet fairing and a flap sheet fairing;

[0020] The main wing sheet fairing is composed of 5 flat plates, with 1 plate in the middle arranged centrally, 2 plates at the front parallel to the middle plate, and the remaining 2 plates arranged along the cross-sectional edge of the fin tip; the flap sheet fairing is composed of 3 flat plates, with 1 plate in the middle arranged centrally, and the remaining 2 plates arranged along the cross-sectional edge of the fin tip and close to the edges of the upper and lower wing surfaces of the main wing. The fairing close to the edges of the upper and lower wing surfaces of the main wing extends from the flap to the flap extension plate;

[0021] The middle flap reinforcement plate is arranged in the middle of the upper and lower wing surfaces of the flap and extends from the flap to the flap extension plate. The flap root end plate is arranged at the fin root of the upper and lower wing surfaces of the flap and extends from the flap to the flap extension plate. The flap tip end plate is arranged at the fin tip of the upper and lower wing surfaces of the flap and extends from the flap to the flap extension plate;

[0022] The angle between the fairing flat plate near the edges of the upper and lower wing surfaces and the center symmetry plane of the fin is no more than 6°, and the head-to-tail direction spacing between adjacent flat plates of the fairing near the edges of the upper and lower wing surfaces is 5% - 10% of the total length of the average chord length of the main wing and the average chord length of the flap.

[0023] The beneficial effects of the present invention are as follows:

[0024] First, the trailing edge of the main wing of the present invention is hinged to the leading edge of the flap through a flap shaft. The main wing drives the leading edge of the flap to rotate a predetermined angle along the center line of the main wing fin shaft. The trailing edge of the flap is connected to the leading edge of the flap extension plate. The length of the average chord length of the flap extension plate is 20% - 35% of the total length of the average chord length of the main wing and the average chord length of the flap. When the sectional profile of the flap fin has the same chord length, the maximum thickness of the trapezoidal flap fin section of the present invention is reduced by 20% - 35% compared with the trapezoidal flap fin section of the prior art, which is beneficial to further reduce the fluid pressure difference resistance of the fin during high-speed navigation. The flap transmission mechanism is located at the fin root and is installed outside the leading edge of the flap. The flap transmission mechanism drives the flap to rotate a predetermined angle along the center line of the flap shaft and has a rotational movement in the same direction relative to the main wing around the center line of the main wing fin shaft, increasing the swept area of the flap movement, so that this fin type can generate greater lift generated by active flapping when moored or at low speed conditions;

[0025] Second, the flap extension plate of the present invention is a flat plate with equal thickness; the sectional thicknesses of the fin root and the fin tip gradually become smaller smoothly from the main wing to the flap and then extend outward to a predetermined length in an equal thickness to the outside of the trailing edge of the flap. Compared with the prior art, the maximum thickness of the fin profile airfoil is smaller and the thickness of the trailing edge extension flat plate of the flap is smaller, so that the minimum drag coefficient of this fin is equivalent to the minimum drag coefficient of the flap fin. The fin profile airfoil jointly composed of the main wing, the flap and the flap extension plate increases the effective camber of the sectional airfoil of the flap fin, so that this fin type has a higher lift coefficient under medium and high speed conditions, enabling the fin with the same area to have a greater ability to generate fluid lift when there is a sailing speed, and at the same time not increasing the minimum fluid resistance of the fin;

[0026] Third, a fixing plate is provided on the outside of the leading edge of the flap at the fin root of the flap of the present invention. The fixing plate is used to install the flap transmission mechanism. The fixing plate is provided with a long circular hole. The flap transmission mechanism is assembled in the long circular hole. The flap transmission mechanism meshes and rotates with the inner profile line trajectory of the long circular hole under the drive of the main wing. Compared with the flap fin of the prior art, under the condition of the same aspect ratio, the maximum lift coefficient can be increased by more than 5%, and the stall angle of attack of the fin is reduced by more than 2°; under the condition of the same fin rotation speed, the lift generated by the active flapping of this fin using the "paddle principle" is higher, thereby greatly improving the ability of the fin to generate lift by active flapping when moored or at low speed, and further improving the anti-rolling ability of the fin when moored or at low speed;

[0027] Fourth, the flap drive mechanism of the present invention adopts a V-shaped guide rail and a V-shaped groove roller. The V-shaped groove roller and the V-shaped guide rail form a meshing rolling pair, which is beneficial to reducing the adverse effects of friction during the rotation of the fin; the V-shaped structure of the V-shaped guide rail and the V-shaped groove roller has a self-cleaning function during the meshing rolling process. A "scraping" motion is generated at the meshing part of the V-shaped roller and the guide rail, which can scrape debris from the V-shaped guide rail and keep the surfaces of the V-shaped guide rail and the roller clean. It is more suitable for harsh underwater working environments containing sediment, marine organism attachments, etc., and is beneficial to extending the service life of the flap drive mechanism;

[0028] Fifth, the fairing, the intermediate reinforcement plate of the flap, the root end plate of the flap, and the tip end plate of the flap of the present invention are beneficial to improving the fluid lift of the flap fin and reducing the intensity of the trailing vortex generated at the fin tip;

[0029] Sixth, the full-speed trapezoidal flap fin of the present invention can make full use of the "paddling principle" or the "wing principle" to generate greater lift whether in the ship mooring state or low-speed working conditions, or in the working conditions with speed. The full-speed trapezoidal flap fin is applicable to the anti-rolling application of the ship anti-rolling fin device within the full speed range, expanding the applicable range of the original trapezoidal flap fin and realizing the expansion of the full-speed anti-rolling ability. Description of the Drawings

[0030] Figure 1 is a horizontal projection schematic diagram of a flap fin of the prior art;

[0031] Figure 2 is Figure 1 a cross-sectional view taken along A-A of

[0032] Figure 3 is a horizontal projection schematic diagram of the full-speed trapezoidal flap fin of the present invention;

[0033] Figure 4 is Figure 3 a cross-sectional view taken along B-B of

[0034] Figure 5 is Figure 2 and Figure 3 a comparative schematic diagram of the sectional profiles of the trapezoidal flap fins of

[0035] Figure 6 is a three-dimensional structure schematic Figure 1 ;

[0036] Figure 7 is a schematic diagram of the fin rotation sweeping area of the full-speed trapezoidal flap fin of the present invention;

[0037] Figure 8 is a schematic diagram of the fin rotation sweeping area of the trapezoidal flap fin of the prior art;

[0038] Figure 9 is a side view of the full-speed trapezoidal flap fin of the present invention;

[0039] Figure 10 is Figure 9 a sectional view taken along C-C of

[0040] Figure 11 is Figure 9 a sectional view taken along D-D of

[0041] Figure 12 is a schematic diagram of the force on the rotating fin of the full-speed trapezoidal flap fin according to an embodiment of the present invention Figure 1 ;

[0042] Figure 13 is a schematic diagram of the force on the rotating fin of the full-speed trapezoidal flap fin according to an embodiment of the present invention Figure 2 ;

[0043] Figure 14 is a schematic diagram of the relative rolling range of the rolling motion amplitude between the V-groove roller and the guide rail according to an embodiment of the present invention;

[0044] Figure 15 is a schematic diagram of the three-dimensional structure of the full-speed trapezoidal flap fin of the present invention Figure 2 。

[0045] Wherein, 1-main wing; 10-central line of the main wing fin axis; 2-flap; 20-central line of the flap axis; 21-flap transmission mechanism; 210-V-shaped guide rail; 211-V-groove roller; 22-central line of the flap transmission shaft; 23-long circular hole; 3-fin root; 4-fin tip; 5-average chord line; 6-flap extension plate; 7-flow deflector; 8-middle reinforcement plate of the flap; 9-end plate at the root of the flap. Detailed implementation manners

[0046] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0047] The orientation terms such as up, down, left, right, front and back in the present application document are established based on the positional relationship shown in the drawings. If the drawings are different, the corresponding positional relationship may also change accordingly. Therefore, it should not be understood as a limitation of the protection scope.

[0048] In this application, terms such as "installation", "connection", "engagement", "linkage", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection or a connection that enables mutual communication, a direct connection, or an indirect connection through an intermediate medium. It can be the connection inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] This embodiment describes a full-speed trapezoidal flap fin. Under the same fin main wing rotation angle range and the same transmission ratio relationship between the main wing and the flap rotation angles, the full-speed trapezoidal flap fin increases the percentage of flap chord length. While the main wing rotates, the flap is driven by a transmission mechanism to rotate relative to the main wing, increasing the flap movement sweep area and improving the roll reduction ability of the fin under berthing or low-speed conditions.

[0050] As Figure 3 、 Figure 4 As shown, the full-speed trapezoidal flap fin of this embodiment includes a main wing 1, a flap 2, and a flap extension plate 6. The main wing 1, the flap 2, and the flap extension plate 6 form the main structure of the flap fin, and the overall horizontal projection of the formed main structure is generally trapezoidal. The trailing edge of the main wing 1 is hinged to the leading edge of the flap 2 through a flap shaft, and the flap 2 rotates a predetermined angle along the center line 20 of the flap shaft at the trailing edge of the main wing 1, and this predetermined angle can be changed. The trailing edge of the flap 2 is connected to the leading edge of the flap extension plate 6, and the flap extension plate 6 is a flat plate with uniform thickness.

[0051] Taking Figure 3 the state shown as an example, the fin tip part 4 of the flap fin is formed by the upper profile line of the main wing 1, the upper profile line of the flap 2, and the upper profile line of the flap extension plate 6, and the fin root part 3 of the flap fin is formed by the lower profile line of the main wing 1, the lower profile line of the flap 2, and the lower profile line of the flap extension plate 6. The cross-sectional thickness of both the fin root part 3 and the fin tip part 4 gradually decreases smoothly from the main wing 1 to the flap 2 and then extends to a predetermined length in an equal thickness to the outer side of the trailing edge of the flap 2.

[0052] Section B-B is the section line at the midpoint distance from the fin root part 3 to the fin tip part 4. The distance from the leading edge of the main wing 1 to the trailing edge of the flap extension plate 6 on the section line is the mean chord line 5 of the flap fin. The mean chord line 5 includes the mean chord length of the basic fin profile and the mean chord length of the flap extension plate 6. Among them, the mean chord lengths of the main wing 1 and the flap 2 form the mean chord length of the basic fin profile of the mean chord line 5, and the length of the mean chord length of the flap extension plate 6 is 20% - 35% of the mean chord length of the basic fin profile.

[0053] In this embodiment, the lengths of the fin root and fin tip of the flap extension plate 6 are equal. In another embodiment, the lengths of the fin root and fin tip of the flap extension plate 6 are not equal, but the average chord length of the flap extension plate 6 is 20% - 35% of the average chord length of the basic fin type.

[0054] The main wing fin axis center line 10, the flap axis center line 20, and the flap transmission shaft center line 22 of the present invention are all perpendicular to the average chord line 5.

[0055] A fixing plate is provided on the outside of the leading edge of the fin root of the flap 2. The fixing plate is used to assemble the flap transmission mechanism 21. While the external fin rotation actuator drives the main wing to rotate around the fin axis center, the flap transmission mechanism 21 drives the flap 2 to rotate along the flap axis center line 20 in the same rotation direction as the main wing 1.

[0056] Take Figure 5 the shown state as an example. The dotted line is the cross-sectional profile line of the trapezoidal flap fin of the prior art, and the solid line is the cross-sectional profile line of the trapezoidal flap fin of the present invention. When the cross-sectional profile lines of the trapezoidal flap fin of the prior art and the trapezoidal flap fin of the present invention have the same chord length, the maximum thickness of the cross-section of the trapezoidal flap fin of the present invention is reduced by 20% - 35%, which is beneficial to further reducing the fluid pressure difference resistance of the fin during high-speed navigation. The fin-type profile airfoil jointly composed of the main wing, the flap, and the flap extension plate increases the effective camber of the cross-sectional airfoil of the flap fin, so that the fin type has a higher lift coefficient under medium and high cruising speed conditions.

[0057] As Figure 6 shown, the leading edge of the fixing plate is an arc-shaped structure, and the trailing edge of the fin root of the main wing 1 is provided with a structural shape matching the fixing plate of the flap 2. A long circular hole 23 is provided on the fixing plate, and the flap transmission mechanism 21 is assembled in the long circular hole 23. The flap transmission mechanism 21 meshes and rotates with the inner profile line trajectory of the long circular hole 23, thereby driving the flap 2 to rotate relative to the main wing 1, increasing the flap movement sweep area, and enabling the fin type to generate a greater lift generated by active flapping during berthing or low cruising speed conditions.

[0058] As Figure 7 、 Figure 8 shown, it is a comparison schematic diagram of the sweep areas of the trapezoidal flap fins of the prior art and the present invention during the fin rotation process. When the main wing and flap angles are the same, Figure 7 the sweep areas of the trapezoidal flap fins shown in (a) and (b) in Figure 8 during the fin rotation process are compared with the sweep areas of the existing trapezoidal flap fins shown in (a) and (b) in the prior art

[0059] Compared with the flap fins in the prior art, the flap fins of this embodiment can increase the maximum lift coefficient by more than 5% and reduce the stall angle of attack of the fins by more than 2°. Under the condition of the same fin rotation speed, the lift generated by the active flapping of the fins using the "paddling principle" is higher, thus greatly improving the ability of the fins to generate lift by active flapping during berthing or low-speed navigation, and further improving the anti-rolling ability of the fins during berthing or low-speed navigation.

[0060] As Figure 9 , Figure 10 , Figure 11 As shown, the flap drive mechanism 21 includes a V-shaped guide rail 210 and a V-shaped groove roller 211. The V-shaped guide rail 210 is fixedly installed in the long circular hole 23 of the fixed plate of the flap 2, and the outer edge structure thereof matches the inner circle of the long circular hole 23. The rotating shaft of the V-shaped groove roller 211 is externally connected to a support structure, and the V-shaped groove roller 211 and the V-shaped guide rail 210 form a meshing rolling pair.

[0061] The flap drive mechanism 21 realizes the flap drive function by adopting a rolling friction pair, which is beneficial to reducing the adverse influence of friction during the rotation of the fins. The V-shaped structures of the V-shaped guide rail 210 and the V-shaped groove roller 211 have a self-cleaning function during the meshing rolling process. A similar "scraping" motion is generated at the meshing part of the V-shaped guide rail 210 and the V-shaped groove roller 211, which can scrape off sundries from the V-shaped guide rail and keep the V-shaped guide rail surface and the roller surface clean. It is more suitable for harsh underwater working environments containing sediment, marine organism attachments, etc., and is beneficial to extending the service life of the flap drive mechanism.

[0062] The upper and lower edges of the V-shaped groove roller 211 and the V-shaped guide rail 210 are in clearance fit, and the contact between the upper edge or the lower edge of the V-shaped groove roller 211 and the V-shaped guide rail 210 is determined by the direction of the flap rotation torque. The force state of the flap drive mechanism 21 during the fin rotation process of the full-speed trapezoidal flap fins of this embodiment is as follows:

[0063] As Figure 12 As shown, when the water flow velocity is V, under the action of the water flow, the resultant fluid force F1 acting on the flap generates a torque of -M1 on the hinge center of the flap shaft. At this time, the V-shaped roller contacts the top of the V-shaped guide rail 210, generating a resultant force F2, which generates a torque of M1 on the flap shaft center to balance the torque of the flap relative to the flap shaft center generated by the action of the fluid.

[0064] As Figure 13 As shown, when the water flow velocity is V, under the action of the water flow, the resultant fluid force F1 acting on the flap generates a torque of M1 on the flap shaft center. At this time, the V-shaped roller contacts the bottom of the V-shaped guide rail 210, generating a resultant force F2, which generates a torque of -M1 on the flap shaft center to balance the torque of the flap relative to the flap shaft center generated by the action of the fluid.

[0065] When the main wing 1 rotates, the relative rolling range of the rolling motion amplitude between the V-groove roller 211 and the V-guide rail 210 is determined by the relative positional relationship among the center lines 10 of the main wing fins, 20 of the flap shaft, and 22 of the flap transmission shaft, which are parallel to each other, and the rotation angle range of the fin shaft of the main wing 1.

[0066] As Figure 14 shown, the relative rolling range of the rolling motion amplitude between the V-groove roller 211 and the V-guide rail 210 is determined by the following formula:

[0067] ;

[0068] In the formula: is the predetermined distance from the center line 10 of the main wing fins to the center line 22 of the flap transmission shaft, is the predetermined distance from the center line 10 of the main wing fins to the center line 20 of the flap shaft, is the rotation angle of the main wing.

[0069] The meshing rolling pair composed of the V-guide rail 210 and the V-groove roller 211 in this embodiment is not only applicable to the full-speed trapezoidal flap fins, but also can be applied to other forms of flap fins.

[0070] As Figure 15 shown, the full-speed trapezoidal flap fin of the present invention further includes a fairing 7, a flap intermediate reinforcing plate 8, a flap root end plate 9, and a flap tip end plate.

[0071] The fairing 7 is a sheet-like structure, including a main wing sheet-like fairing and a flap sheet-like fairing. The main wing sheet-like fairing is arranged at the fin tip of the main wing 1, and the flap sheet-like fairing is arranged at the fin tip of the flap 2.

[0072] The main wing sheet-like fairing in this embodiment is composed of 5 flat plates, among which 1 plate is arranged in the middle, the other 2 plates near the bow are arranged parallel to the middle 1 plate, and the remaining 2 plates are arranged along the edge of the fin tip cross-section; the flap sheet-like fairing is composed of 3 flat plates, among which 1 plate is arranged in the middle, and the remaining 2 plates are arranged along the edge of the fin tip cross-section and near the upper and lower wing surfaces. The fairing near the upper and lower wing surfaces extends from the flap 2 to the flap extension plate 6 and has an angle not greater than 6° with the fin middle symmetry plane. The distance between the head and tail of the fairing near the upper and lower wing surfaces is 5% - 10% of the average chord length of the basic fin type.

[0073] The flap intermediate reinforcing plate 8 is arranged in the middle of the upper and lower wing surfaces of the flap and extends from the flap 2 to the flap extension plate 6. The flap root end plate 9 is arranged at the fin root of the upper and lower wing surfaces of the flap and extends from the flap 2 to the flap extension plate 6. The flap tip end plate is arranged at the fin tip of the upper and lower wing surfaces of the flap and extends from the flap 2 to the flap extension plate 6.

[0074] The full-speed trapezoidal flap fin of this embodiment can not only be applicable to the working conditions with speed. When the ship is in the mooring state, it can make full use of the "paddling principle" to actively flap and generate a relatively high lift, thereby improving the anti-rolling ability of the fin in the mooring situation, expanding the applicable range of the original trapezoidal flap fin, and realizing the expansion of the full-speed anti-rolling ability.

[0075] The above are only the embodiments of the present invention, and common knowledge such as the specific structures and characteristics known in the solutions is not described in detail here. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced by the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A full-speed trapezoidal flap fin, characterized in that: It comprises a main wing (1), a flap (2) and a flap extension plate (6), wherein the flap (2) comprises a flap transmission mechanism (21); The trailing edge of the main wing (1) and the leading edge of the flap (2) are hinged together via a flap shaft, the main wing (1) drives the leading edge of the flap (2) to have a rotational freedom of a predetermined angle along the center line (10) of the main wing fin shaft, and the trailing edge of the flap (2) is connected to the leading edge of the flap extension plate (6); The flap transmission mechanism (21) is mounted on the leading edge of the flap (2), and based on the rotation direction of the main wing (1) around the main wing fin axis centerline (10), the flap transmission mechanism (21) drives the flap (2) to rotate relative to the main wing (1) along the flap axis centerline (20) in the same rotation direction as the main wing (1); The fin tip (4) of the full-speed trapezoidal flap fin is formed by the upper mold line of the main wing (1), the upper mold line of the flap (2) and the upper mold line of the flap extension plate (6), and the fin root (3) of the full-speed trapezoidal flap fin is formed by the lower mold line of the main wing (1), the lower mold line of the flap (2) and the lower mold line of the flap extension plate (6); The flap extension plate (6) is a flat plate of equal thickness; the cross-sectional thickness of the fin root (3) and the fin tip (4) both smoothly transition from the main wing (1) to the flap (2) and gradually decrease, and then extend to the outside of the trailing edge of the flap (2) with equal thickness to a predetermined length.

2. The full-speed trapezoidal flap fin according to claim 1, characterized in that: The length of the average chord length of the flap extension plate (6) is 20% to 35% of the total length of the average chord length of the main wing (1) and the average chord length of the flap (2), and the average chord length line (5) is the distance from the midpoint of the leading edge of the main wing (1) to the midpoint of the trailing edge of the flap extension plate (6).

3. The full-speed trapezoidal flap fin according to claim 2, characterized in that: A fixing plate is provided at the fin root of the flap (2) and the leading edge of the flap (2), and an oblong hole (23) is provided on the fixing plate. The flap transmission mechanism (21) is assembled in the oblong hole (23). The flap transmission mechanism (21) meshes and rotates with the inner mold line track of the oblong hole (23), thereby driving the flap (2) to rotate in the same direction relative to the main wing (1) around the flap axis centerline (20).

4. The full-speed trapezoidal flap fin according to claim 3, characterized in that: The flap transmission mechanism (21) comprises a V-shaped guide rail (210) and a V-shaped groove roller (211); the V-shaped guide rail (210) is fixedly installed in the oblong hole (23), and the outer edge structure matches the inner circle of the oblong hole (23); the rotating shaft of the V-shaped groove roller (211) is externally connected to the supporting structure.

5. The full-speed trapezoidal flap fin according to claim 4, characterized in that: The V-groove roller (211) and the V-shaped guide rail (210) form a meshing rolling motion pair, the upper and lower edges of the V-groove roller (211) and the V-shaped guide rail (210) are clearance-matched, and the direction of the flap rotation torque determines whether the V-groove roller (211) contacts the upper edge or the lower edge of the V-shaped guide rail (210).

6. The full-speed trapezoidal flap fin according to claim 5, characterized in that: The main wing fin axis centerline (10), the flap axis centerline (20) and the flap transmission axis centerline (22) are all perpendicular to the average chord length line (5); the main wing fin axis centerline (10) is the centerline of the fin axis of the external fin actuator of the main wing (1), and the flap transmission axis centerline (22) is the centerline of the external support structure rotation axis of the V-groove roller (211).

7. The full-speed trapezoidal flap fin according to claim 6, characterized in that: When the main wing (1) rotates, the relative rolling range of the rolling motion amplitude of the V-groove roller (211) and the V-shaped guide rail (210) is determined based on the relative positional relationship between the mutually parallel main wing fin axis centerline (10), the flap axis centerline (20) and the flap transmission axis centerline (22) and the rotation angle range of the fin axis of the main wing (1).

8. The full-speed trapezoidal flap fin according to claim 1, characterized in that: The full-speed trapezoidal flap fin further comprises a fairing (7), a flap middle reinforcement plate (8), a flap root end plate (9) and a flap tip end plate; the fairing (7) is a sheet-like structure, comprising a main wing sheet-like fairing and a flap sheet-like fairing; The main wing sheet-shaped fairing is composed of five flat plates, of which the middle one is arranged in the center, the two front plates are arranged parallel to the middle one, and the remaining two plates are arranged along the cross-sectional edge of the fin tip; the flap sheet-shaped fairing is composed of three flat plates, of which the middle one is arranged in the center, and the remaining two plates are arranged along the cross-sectional edge of the fin tip and close to the upper and lower airfoil edges of the main wing, and the fairing close to the upper and lower airfoil edges of the main wing extends from the flap (2) to the flap extension plate (6); The flap middle reinforcement plate (8) is arranged at the middle of the upper and lower wing surfaces of the flap, and extends from the flap (2) to the flap extension plate (6); the flap root end plate (9) is arranged at the fin root of the upper and lower wing surfaces of the flap, and extends from the flap (2) to the flap extension plate (6); the flap tip end plate is arranged at the fin tip of the upper and lower wing surfaces of the flap, and extends from the flap (2) to the flap extension plate (6); The fairing (7) near the edges of the upper and lower wing surfaces has an angle of no more than 6° with the middle symmetry plane of the fin, and the distance between the fairing (7) near the edges of the upper and lower wing surfaces and the adjacent fairing plates in the fore-aft direction is 5% to 10% of the total length of the average chord length of the main wing (1) and the average chord length of the flap (2).

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