Adjustable stern wake energy recovery power generation device
By collecting wake energy at the stern using adjustable hydrofoils and a small cross-flow generator, the problem of energy waste and pollution emissions from ships is solved, clean energy is recovered and utilized, and speed and energy conversion efficiency are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-11
- Publication Date
- 2026-04-10
AI Technical Summary
During navigation, existing ships cannot effectively recover and utilize wake energy, resulting in increased wave-making resistance, pollutant emissions, and energy waste.
It adopts adjustable lifting hydrofoils and a cross-flow small power generation device. By adjusting the lifting and angle of the main wing and the small wing, the energy of the tailwater is collected and converted into electrical energy, which is then stored and utilized by the energy-saving current storage overflow network.
It reduces wave-making resistance, increases speed, reduces pollutant emissions, and enables the reuse of clean energy.
Smart Images
Figure CN121828072A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of stern wake energy recovery technology, and particularly relates to an adjustable stern wake energy recovery power generation device. BACKGROUND
[0002] When a ship sails on the water, the ship body tilts left and right (roll) or tilts front and back (pitch) due to uneven load distribution, which causes disturbance to the surrounding water, and the liquid pressure distribution around the ship body changes, thereby generating waves. Ship waves are divided into bow waves and stern waves, and the ship waves propagate in the water medium. If the bow wave and the stern wave superimpose on each other at the stern, the wave-making resistance increases; if the bow wave and the stern wave cancel each other at the stern, the wave-making resistance decreases. Therefore, the wave-making resistance is mainly related to the speed and the length of the ship, and the wake generated by the wave-making resistance is the ship wave wake.
[0003] During the sailing process of a ship, a strong wake energy is generated in the rotation area of the propeller. This is because when the ship moves in the water, the outer layer of water molecules adheres to the inner layer of water molecules to generate friction, and the water flow moving with the ship is the friction wake. Due to the influence of the shape and viscosity of the ship and the propeller, the water flow moves towards the stern, and the potential energy changes into kinetic energy, and the kinetic energy changes into potential energy. Due to friction, the potential energy at the stern is lower than that at the bow. At the same time, due to the change of the ship shape, the flow line changes and vortex flow appears, and the wake generated thereby is the potential wake.
[0004] The distribution of the wake at the stern is that the wake speed near the ship side is large, and the wake speed far from the ship side is small. The wake speed on the upper half of the propeller disc is large, and the wake speed on the lower half of the propeller disc is small. In addition, when the ship speed is high, the wake speed is large, and when the ship speed is low, the wake speed is small. When the ship speed is zero, the wake speed is also zero. The wake is generated by the ship resistance, and the wake energy disappears into the sea surface in the form of wave radiation, so it is impossible to artificially create wake. If there is a wake energy recovery device, the ship wake is recovered and reused as a new clean energy, which will make the ship become a green ship that reduces pollution and greenhouse gas emissions, and endows the ship with new market competitiveness. SUMMARY
[0005] The purpose of the present application is to solve the above-mentioned problems in the prior art, and to provide an adjustable stern wake energy recovery power generation device.
[0006] To solve the above technical problems, the technical scheme adopted by the present application is: an adjustable stern wake energy recovery power generation device, comprising an adjustable lifting hydrofoil, a through-flow small power generation device and an energy-saving current storage overflow net, wherein the adjustable lifting hydrofoil is installed on a ship stern plate and comprises a main wing plate, a depth lifting adjustment mechanism, a small wing plate and an angle lifting adjustment mechanism, the depth lifting adjustment mechanism being capable of adjusting and controlling the wave pressing position of the main wing plate; the through-flow small power generation device is installed in the main wing plate of the adjustable lifting hydrofoil and converts energy in a liquid through-flow mode to collect tail water energy; the energy-saving current storage overflow net is connected with the through-flow small power generation device and a marine generator and is used for storing the current rectified by the through-flow small power generation device to assist the marine power function.
[0007] Further, the depth lifting adjustment mechanism in the adjustable lifting hydrofoil is arranged outside the ship stern plate, a spacer plate is arranged between the depth lifting adjustment mechanism and the stern plate, the spacer plate is vertically fixed to the outer surface of the stern plate, the depth lifting adjustment mechanism comprises a driving wheel, a lifting rack, a driven wheel, a guide limiting block and a fixed plate, the guide limiting block is arranged at least one and is fixed to the side of the spacer plate, and a rack sliding space is formed between the spacer plate and the guide limiting block, the lifting rack is vertically and slidingly installed in the rack sliding space, the driving wheel and the driven wheel are both rotationally installed on the stern plate and are located on the toothed side of the lifting rack and engaged with the lifting rack to drive the lifting rack to lift, and the fixed plate is fixedly installed on the outer side of the lifting rack and extends downward.
[0008] Further, the depth lifting adjustment mechanism is provided with two and is arranged in parallel at a relative interval, and the main wing plate is fixedly installed at the lower end of the two fixed plates and is kept horizontal and synchronously lifted.
[0009] Further, the small wing plate is rotationally installed at the tail end side of the main wing plate, and the bow end side of the main wing plate is arranged in a streamline shape.
[0010] Each depth lifting adjustment mechanism corresponds to an angle lifting adjustment mechanism, and each angle lifting adjustment mechanism comprises a control box, an extension oil cylinder, a small connecting rod, a curved rod and a large connecting rod, the control box is fixedly installed on the lifting rack, and the extension oil cylinder is arranged at the bottom of the control box, one end of the small connecting rod is hingedly connected to the extension rod of the extension oil cylinder, the other end of the small connecting rod is hingedly connected to the upper end of the curved rod, the curved rod is rotationally fixed to the fixed plate through a fixing piece at the bending part of the curved rod, the lower end of the curved rod is hingedly connected to one end of the large connecting rod, and the other end of the large connecting rod is hingedly connected to an eye plate fixed on the upper surface of the small wing plate.
[0011] Furthermore, multiple cross-flow miniature power generation devices are arranged side-by-side at equal intervals inside the main wing plate. Each cross-flow miniature power generation device includes an inlet pipe, a guide vane sealing cover, a guide vane, a rotor, a rotating connecting rod, a speed increaser, a generator, a current output line, and an outlet pipe. The guide vane sealing cover is fixedly installed inside the main wing plate and has a cavity inside. The inlet pipe opens forward to the leading end of the main wing plate and connects to the guide vane sealing cover. The rotating connecting rod is rotatably installed inside the guide vane sealing cover and coaxially fixedly installed with the guide vane and the rotor. The rotating connecting rod extends backward out of the guide vane sealing cover and connects to the speed increaser. The speed increaser is connected to the generator, and the generator is connected to the energy-saving current storage overflow network through the current output line. The outlet pipe connects to the guide vane sealing cover and extends backward and downward to the outside of the main wing plate.
[0012] Furthermore, the inlet end of the water inlet pipe is flared, and an inlet pressure sensor is installed on the water inlet pipe; an outlet pressure sensor is installed on the water outlet pipe.
[0013] Furthermore, the outlet end of the inlet conduit is positioned higher than the inlet end of the outlet conduit.
[0014] Furthermore, when the value monitored by the inlet pressure sensor is less than the preset value range, the main wing plate first descends to the waterline; then, based on the comparison of the monitoring values of the inlet pressure sensor and the outlet pressure sensor, when the inlet pressure is low, the small wing plate adjusts downward at an angle, and when the inlet pressure is high, the small wing plate adjusts upward at an angle.
[0015] When the value monitored by the inlet pressure sensor exceeds the preset range, the main wing plate rises to maintain the standard draft. Then, based on the comparison of the monitoring values of the inlet pressure sensor and the outlet pressure sensor, when the inlet pressure is low, the small wing plate flips downwards, and when the inlet pressure is high, the small wing plate flips upwards by an angle.
[0016] Furthermore, the energy-saving current storage overflow network includes a rectifier, a DC bus, multiple converters, inverters, and corresponding marine functional electrical equipment. The rectifier is connected to the generators in the multiple axial-flow small power generation devices via current output lines. The rectified current is connected to the multiple converters and inverters arranged in parallel via the DC bus. The multiple converters and inverters are connected to the marine functional electrical equipment via corresponding lines.
[0017] Furthermore, the power load P recovered by the small-scale cross-flow power generation device is measured as follows, and the corresponding formula is: Where: N is the number of small-scale cross-flow power generation devices; η is the energy conversion coefficient of water kinetic energy in a small-scale cross-flow power generation device, with a value ranging from 0.72 to 0.83; ρ is the density of the fluid; the density of seawater is taken as 1.025 kg / m³. 3 ; g is the acceleration due to gravity, with a value of 9.80 m / s². 2 ; Q represents the fluid flow rate inside the guide vane seal, in meters per second (m³). 3 ; H represents the effective pressure head, measured in meters (m).
[0018] The formula for calculating the fluid flow rate Q inside the guide vane sealing cover is as follows: In the formula: Vc is the fluid velocity inside the guide vane sealing cover, in m / s; Ac is the cross-sectional area inside the guide vane sealing cover, in meters. 2 ; t represents the fluid flow rate and time inside the guide vane sealing cover, in seconds.
[0019] The formula for calculating the effective pressure head H is as follows: Where: h is the height of the wave crest point in front of the inlet duct of the small cross-flow generator, in meters; Vac is the fluid velocity before the inlet duct in a small-scale cross-flow power generation device, in m / s.
[0020] The formula for calculating the fluid velocity Vac before the above-mentioned inlet pipe is as follows: In the formula: Vt is the propeller wake velocity, in m / s; λ is the energy loss distribution coefficient of the propeller wake in the wake region, and its value ranges from 0.65 to 0.98.
[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. The overall structure of this invention is similar to the function of a wave deflector, which increases the "virtual length" of the stern, increases the hull elongation coefficient, reduces the height of the "tail current", thereby reducing the energy loss of the ship near the wake field, reducing the wave-making resistance of the ship, and boosting the speed.
[0022] 2. Stern Wake Energy Harvesting. During navigation, the wake at the stern generates greater water pressure due to the wave compression effect of this device. This pressure enters the energy harvesting unit through the inlet pipe at the lower edge of the device's bow. The energy harvesting unit converts the water potential energy into electrical energy, which is then supplied to the ship's power collection system (battery pack). Since a single harvesting unit has limited capacity, multiple identical units can be deployed for collection, storage, and application to the ship's electrical grid. This effectively maximizes the conversion of water potential energy into usable kinetic energy. The reduced water pressure discharged from the energy harvesting unit due to energy conversion alleviates ship rolling and reduces wave-making drag. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the adjustable lifting hydrofoil in this invention; Figure 3 This is a schematic diagram of the assembly structure of the depth lifting and adjusting mechanism in this invention; Figure 4 This is a three-dimensional schematic diagram of the sliding assembly of the lifting rack in this invention; Figure 5 This is a schematic diagram of the structure of the small-scale through-flow power generation device in this invention; Figure 6 This is a schematic diagram of the energy-saving current storage overflow network in this invention; Figure 7 This is a schematic diagram showing three different draft states of the adjustable lifting hydrofoil in this invention; Figure 8 This is an application scenario diagram of the recoverable electrical load power of the cross-flow small power generation device in this invention; The proportions shown in the diagram are not the proportions used in actual applications; they are mainly used to illustrate the main components of each structure. 1. Stern sealing plate; 2. Adjustable lifting hydrofoil; 3. Through-flow small generator; 4. Pad plate; 201. Lifting rack; 202. Drive wheel; 203. Driven wheel; 204. Fixed plate; 205. Main wing plate; 206. Small wing plate; 207. Guide limit block; 208. Positioning block; 209. Eye plate; 210. Control box; 211. Telescopic cylinder; 212. Small connecting rod; 213. Crank rod; 214. Large connecting rod; 31. Inlet pipe; 32. Guide vane sealing cover; 33. Guide vane; 34. Rotating wheel; 35. Rotating connecting rod; 36. Speed increaser; 37. Generator; 38. Current output line; 39. Outlet pipe; 40. Inlet pressure sensor; 41. Outlet pressure sensor. Detailed Implementation
[0024] It should be noted that in the description of this invention, terms such as "upper", "lower", "left", "right", "head", "tail", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are only used to facilitate the description of the structural relationship between the components in this invention and do not specifically mean that any component in this invention must have a specific orientation, be constructed and operated in a specific orientation, or be construed as a limitation of this invention.
[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0026] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings: like Figure 1 As shown, an adjustable stern wake energy recovery power generation device is installed on the outside of the stern sealing plate 1 of a ship. It includes an adjustable lifting hydrofoil 2, a cross-flow small power generation device 3, and an energy-saving current storage overflow network. The stern sealing plate 1 is the vertical flat plate at the stern of the ship, and two pads 4 are fixedly installed on its outer surface at intervals.
[0027] The adjustable lifting hydrofoil 2 is mounted on the pad 4, combined with Figures 2 to 4As shown, the device includes a main wing plate 205, a depth lifting adjustment mechanism, a small wing plate 206, and an angle lifting adjustment mechanism. Two sets of depth lifting adjustment mechanisms are provided, respectively mounted on the two pads 4. Each set includes a lifting rack 201, a drive wheel 202, a driven wheel 203, at least one guide limiting block 207, and a fixing plate 204. The guide limiting block 207 is fixedly installed beside the pad 4 and extends towards the pad 4, forming an installation guide groove with a relative gap between it and the pad 4. The lifting rack 201 is vertically slidably installed in the matching installation guide groove, with its toothed side facing outwards. The drive wheel 202 is rotatably mounted on the stern sealing plate 1 beside the lifting rack 201. A drive motor fixed inside the hull engages with the toothed side of the lifting rack 201, enabling it to slide up and down along the guide limit block 207. A driven wheel 203 is rotatably mounted on the stern sealing plate 1 below the drive wheel 202, also engaging with the toothed side of the lifting rack 201 to assist its smooth up-and-down movement. The fixed plate 204 is welded and fixed to the outside of the lifting rack 201 and extends diagonally downwards. The lower ends of the two fixed plates 204 in the two depth lifting adjustment mechanisms are fixedly installed to the top surface of the main wing plate 205, maintaining its stability and horizontal alignment. The drive wheels 202 in the two depth lifting adjustment mechanisms operate synchronously, thereby driving the main wing plate 205 to rise and fall smoothly. Further optimized, a positioning block 208 is fixedly installed on the side of the pad plate 4. The lifting rack 201 slides relative to the positioning block 208, which limits the vertical sliding range of the fixed plate 204. The main wing plate 205 has a streamlined front end and a small wing plate 206 is rotatably mounted on its rear end. Multiple spaced eye plates 209 are welded and fixed to the upper surface of the small wing plate 206.
[0028] Each of the aforementioned depth lifting and lowering adjustment mechanisms is equipped with an angle lifting and lowering adjustment mechanism. Each angle lifting and lowering adjustment mechanism includes a control box 210, a telescopic cylinder 211, a small connecting rod 212, a crank rod 213, and a large connecting rod 214. The control box 210 is fixedly installed on the aforementioned lifting rack 201, and the telescopic cylinder 211 is located at the bottom of the control box 210. The operation of the telescopic cylinder 211 is controlled by the control box 210. The upper end of the small connecting rod 212 is hinged to the extension rod 214. The lower end of the telescopic rod of the hydraulic cylinder 211 is hinged to the upper end of the curved rod 213; the curved rod 213 is bent at an obtuse angle, and its bend is rotatably mounted on the fixed plate 204 by a fixing member; the lower end of the curved rod 213 is hinged to one end of the large connecting rod 214, and the other end of the large connecting rod 214 is hinged to the eye plate 209 fixed on the upper surface of the small wing plate 206. The extension and retraction of the hydraulic cylinder 211 can drive the angle of the small wing plate 206 to change.
[0029] Multiple cross-flow miniature power generation devices 3 are installed side-by-side at equal intervals inside the main wing plate 205 to maximize the collection and utilization of wake current. Combined with... Figure 5 As shown, each small cross-flow generator 3 includes an inlet pipe 31, a guide vane sealing cover 32, a guide vane 33, a rotor 34, a rotating connecting rod 35, a speed increaser 36, a generator 37, a current output line 38, and an outlet pipe 39. The guide vane sealing cover 32 is fixedly installed inside the main wing plate 205, and its interior is a hollow cavity. The guide vane 33 is rotatably mounted inside the guide vane sealing cover 32 via the rotating connecting rod 35. The rotor 34 is also coaxially fixedly mounted on the rotating connecting rod 35. The rotating connecting rod 35 extends outward from the guide vane sealing cover 32 and is connected to the speed increaser 36. The speed increaser 36 is connected to the generator 37. The aforementioned inlet conduit 31 opens forward to the front end of the main wing plate 205 and connects inward to the interior of the aforementioned guide vane sealing cover 32. The front opening of the inlet conduit 31 is funnel-shaped to facilitate the intake of floodwater. The rear end of the inlet conduit 31 gradually narrows into a smaller opening, increasing the potential energy of the incoming floodwater, which in turn drives the aforementioned guide vane 33 to rotate the impeller 34. This rotation is transmitted to the aforementioned speed increaser 36 via the aforementioned rotating connecting rod 35, increasing the speed ratio and then driving the generator 37 connected to it to generate electricity. The current generated by the generator 37 is output to the aforementioned energy-saving current storage overflow network via the current output line 38. The rear end of the guide vane sealing cover 32 is connected to an outlet conduit 39 that communicates with the outside of the main wing plate. The inlet end of the outlet conduit 39 is positioned lower than the outlet end of the aforementioned inlet conduit 31 to facilitate the outflow of water from inside the guide vane sealing cover 32, achieving a flow effect and thus driving the guide vane 33 to rotate.
[0030] Furthermore, an inlet pressure sensor 40 is installed on the inlet pipe 31, and an outlet pressure sensor 41 is installed on the outlet pipe 39, to facilitate the detection of flood flow changes.
[0031] The depth lifting adjustment mechanism of the adjustable lifting hydrofoil 2 mentioned above drives the lifting position of the main wing plate 205 and the small wing plate 206. The angle lifting adjustment mechanism can adjust the tail angle of the small wing plate 206, so that the cross-flow small power generation device 3 in the main wing plate 205 is always in the best water-facing position in the stern flow field.
[0032] When the ship has a heavy load, large draft, and high waterline, the pressure value monitored by the aforementioned inlet pressure sensor 40 exceeds the preset range in the system. First, the drive wheel 202 raises the lifting rack 201, which in turn raises the main wing plate 205 and the small wing plate 206 via the fixed plate 204 to reach the optimal waterline plane. Then, based on the comparison between the values monitored by the inlet pressure sensor 40 and the outlet pressure sensor 41, the angle of the small wing plate 206 is adjusted. Figure 7As shown in (a), when the inlet pressure is high, the small wing plate 206 rotates upwards at an angle to adjust, making the water outlet pipe 39 flow without resistance, thereby reducing the inlet flow and achieving stable current output; Figure 7 As shown in (c), when the inlet pressure is low, the small wing plate 206 is tilted downwards by the angle adjustment mechanism, so that there is a certain resistance when water is discharged from the outlet pipe 39, thereby increasing the impact of the flood in the inlet pipe 31 on the guide vane 33 and increasing the current output.
[0033] When the ship's load is low, draft is small, and waterline is low, the pressure value monitored by the aforementioned inlet pressure sensor 40 is less than the preset range within the system. First, the drive wheel 202 lowers the lifting rack 201, which in turn lowers the main wing plate 205 and the small wing plate 206 to the optimal waterline plane. Then, based on the comparison between the values monitored by the inlet pressure sensor 40 and the outlet pressure sensor 41, the angle of the small wing plate 206 is adjusted. Conversely, this ultimately achieves... Figure 7 The state shown in (b) is as follows.
[0034] Combination Figure 6 As shown, the energy-saving current storage and surplus grid is a new model of green energy recovery and reuse, a new type of integrated power source, grid, load and storage, and multi-energy complementarity. It includes rectifiers, DC buses, multiple converters, inverters and corresponding ship functional electrical equipment. The rectifiers are connected to the generators 37 in the multiple axial small power generation devices 3 through multiple current output lines 38. The current rectified by the rectifiers is connected to the multiple converters and inverters set in parallel through the DC bus. The multiple converters and inverters are connected to the ship functional electrical equipment, such as supercapacitors, marine generators, ship propeller propulsion, and ship lighting, through corresponding lines.
[0035] The recovered power load P (in W) of the above-mentioned small-scale through-flow power generation device 3 is measured as follows, and the corresponding formula is: Where: N is the number of 3 small-scale cross-flow power generation devices; η is the energy conversion coefficient of the kinetic energy of the water in the small-scale cross-flow power generation device, and its value ranges from 0.72 to 0.83; ρ is the density of the fluid; the density of seawater is taken as 1.025 kg / m³. 3 ; g is the acceleration due to gravity, with a value of 9.80 m / s². 2 ; Q represents the fluid flow rate inside the guide vane sealing cover 32, in cubic meters per second (m³). 3 ; H represents the effective pressure head, measured in meters (m).
[0036] The formula for calculating the fluid flow rate Q inside the guide vane sealing cover 32 is as follows: In the formula: Vc is the fluid velocity inside the guide vane sealing cover 32, in m / s; Ac is the inner cross-sectional area of the guide vane sealing cover 32, in meters. 2 ; t represents the fluid flow rate and time inside the guide vane sealing cover 32, in seconds.
[0037] The formula for calculating the effective pressure head H is as follows: In the formula: h is the height of the wave crest point in front of the water inlet pipe 31 in the cross-flow small power generation device 3, in meters; Vac is the fluid velocity before the inlet pipe 31 in the axial flow small power generation device 3, in m / s.
[0038] The formula for calculating the fluid velocity Vac before the aforementioned inlet conduit 31 is as follows: In the formula: Vt is the propeller wake velocity, in m / s; λ is the energy loss distribution coefficient of the propeller wake in the wake region, and its value ranges from 0.65 to 0.98.
[0039] The installation of the aforementioned energy recovery and power generation device also increases the pressure at the stern of the ship, thereby adjusting the ship's sailing attitude. The depth adjustment mechanism regulates the wave-damping position of the main wing plate 205, improving ship turbulence while simultaneously acquiring tailwater energy at the optimal position. The through-flow miniature power generation device 3 converts energy using a liquid through-flow method, collecting tailwater energy. The energy-saving current storage overflow network is connected to the through-flow miniature power generation device 3, used to rectify and store the current triggered by the through-flow miniature power generation device 3, assisting the ship's power network, improving the coordination of power load, and better balancing power usage. This invention also employs a structure that uses a PID control algorithm to drive the impeller 34 and guide vanes 33, with an adjustment cycle ≤0.5s, adapting to rapid ship turning conditions.
[0040] Example 1, The drag reduction effect of installing the above-mentioned overall device on medium and high-speed vessels increases with the increase of the dihedral angle and the length of the wave deflector. When the length increases to 2% LBP, the drag reduction effect decreases. The drag reduction effect is optimal when the dihedral angle is 7 degrees. For low-speed vessels, the length of the main wing plate in the overall device can be determined based on the data from the tank test model.
[0041] Taking the slow-speed navigation of a large, fat ship as an example, and combining the above-mentioned formula for measuring the recovered power load P (in W) of the small through-flow generator 3, the parameter data are as follows: The number of cross-flow small-scale power generation devices 3 is 12. The water kinetic energy conversion coefficient of the cross-flow small-scale power generation devices 3 is taken as 0.72, and the seawater density is taken as 1.025 kg / m³. 3 The acceleration due to gravity g is taken as 9.80 m / s². 2 The propeller wake velocity Vt is 5.14 m / s, and the energy loss distribution coefficient of the propeller wake in the wake section is 0.65; the height of the wave crest point in front of the inlet duct 31 of the through-flow small power generation device 3 is 0.5 m; the fluid velocity Vc inside the guide vane sealing cover 32 is 2.68 m / s, and the cross-sectional area Ac inside the guide vane sealing cover 32 is 0.628 m². 2 The fluid flow rate t inside the guide vane sealing cover 32 is 3600s; the final calculated power P of the recovered electrical load is approximately 562Kw.
[0042] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.
Claims
1. An adjustable stern wake energy recovery and power generation device, characterized in that: The system includes an adjustable hydrofoil, a small through-flow generator, and an energy-saving current storage and overflow network. The adjustable hydrofoil is installed on the stern plate of the ship and includes a main wing plate, a depth adjustment mechanism, a small wing plate, and an angle adjustment mechanism. The depth adjustment mechanism can adjust and control the wave-damping position of the main wing plate. The small through-flow generator is installed inside the main wing plate of the adjustable hydrofoil and converts energy through liquid flow to collect tailwater energy. The energy-saving current storage and overflow network is connected to the small through-flow generator and the marine generator to rectify and store the current triggered by the small through-flow generator, thus supporting the ship's electrical functions.
2. The adjustable stern wake energy recovery and power generation device according to claim 1, characterized in that: The adjustable hydrofoil's depth adjustment mechanism is located outside the stern plate of the ship, with a pad between it and the stern plate. The pad is vertically fixed to the outer surface of the stern plate. The depth adjustment mechanism includes a drive wheel, a lifting rack, a driven wheel, a guide limit block, and a fixing plate. At least one guide limit block is fixed to the side of the pad, forming a rack sliding space with the pad. The lifting rack is vertically slidably installed within the rack sliding space. The drive wheel and the driven wheel are rotatably installed on the stern plate, located on the toothed side of the lifting rack and meshing with it, enabling the lifting rack to rise and fall. The fixing plate is fixedly installed on the outside of the lifting rack and extends obliquely downward.
3. The adjustable stern wake energy recovery and power generation device according to claim 2, characterized in that: The depth lifting and adjusting mechanism is provided in two parts, which are arranged in parallel with relative intervals; the main wing plate is fixedly installed at the lower end of the two fixed plates, keeping them horizontal and lifting and lowering synchronously.
4. The adjustable stern wake energy recovery and power generation device according to claim 2, characterized in that: The small winglet is rotatably mounted on the tail end side of the main winglet, and the nose end side of the main winglet is streamlined. Each depth lifting adjustment mechanism corresponds to an angle lifting adjustment mechanism. Each angle lifting adjustment mechanism includes a control box, a telescopic cylinder, a small connecting rod, a crank rod, and a large connecting rod. The control box is fixedly installed on the lifting rack, and the telescopic cylinder is located at the bottom of the control box. One end of the small connecting rod is hinged to the end of the telescopic rod of the telescopic cylinder, and the other end is hinged to the upper end of the crank rod. The bent part of the crank rod is rotatably fixed to the fixed plate by a fixing member. The lower end of the crank rod is hinged to one end of the large connecting rod, and the other end of the large connecting rod is hinged to the eye plate fixed on the upper surface of the small wing plate.
5. An adjustable stern wake energy recovery and power generation device according to claim 1, characterized in that: Multiple cross-flow miniature power generation devices are arranged side-by-side at equal intervals inside the main wing plate. Each cross-flow miniature power generation device includes an inlet pipe, a guide vane sealing cover, a guide vane, a rotor, a rotating connecting rod, a speed increaser, a generator, a current output line, and an outlet pipe. The guide vane sealing cover is fixedly installed inside the main wing plate and has a cavity inside. The inlet pipe opens forward to the leading end of the main wing plate and connects to the guide vane sealing cover. The rotating connecting rod is rotatably installed inside the guide vane sealing cover and coaxially fixedly installed with the guide vane and the rotor. The rotating connecting rod extends backward out of the guide vane sealing cover and connects to the speed increaser, which is connected to the generator. The generator is connected to the energy-saving current storage overflow network through the current output line. The outlet pipe connects to the guide vane sealing cover and extends backward and downward to the outside of the main wing plate.
6. An adjustable stern wake energy recovery and power generation device according to claim 5, characterized in that: The inlet end of the water inlet pipe is flared, and an inlet pressure sensor is installed on the water inlet pipe; an outlet pressure sensor is installed on the water outlet pipe.
7. An adjustable stern wake energy recovery and power generation device according to claim 5, characterized in that: The outlet end of the inlet pipe is positioned higher than the inlet end of the outlet pipe.
8. An adjustable stern wake energy recovery and power generation device according to claim 6, characterized in that: When the value monitored by the inlet pressure sensor is less than the preset range, the main wing plate first descends to the waterline; then, based on the comparison of the monitoring values of the inlet pressure sensor and the outlet pressure sensor, when the inlet pressure is low, the small wing plate is adjusted downwards; when the inlet pressure is high, the small wing plate is adjusted upwards. When the value monitored by the inlet pressure sensor exceeds the preset range, the main wing plate rises to maintain the standard draft. Then, based on the comparison of the monitoring values of the inlet pressure sensor and the outlet pressure sensor, when the inlet pressure is low, the small wing plate flips downwards, and when the inlet pressure is high, the small wing plate flips upwards by an angle.
9. An adjustable stern wake energy recovery and power generation device according to claim 5, characterized in that: The energy-saving current storage overflow network includes a rectifier, a DC bus, multiple converters, inverters, and corresponding ship functional electrical equipment. The rectifier is connected to the generators in the multiple axial-flow small power generation devices through current output lines. The current rectified by the rectifier is connected to multiple converters and inverters arranged in parallel through the DC bus. The multiple converters and inverters are connected to the ship functional electrical equipment through corresponding lines.
10. An adjustable stern wake energy recovery and power generation device according to claim 5, characterized in that, The power load P recovered by the small-scale cross-flow generator is measured as follows, and the corresponding formula is: Where: N is the number of small-scale cross-flow power generation devices; η is the energy conversion coefficient of water kinetic energy in a small-scale cross-flow power generation device, with a value ranging from 0.72 to 0.83; ρ is the density of the fluid; the density of seawater is taken as 1.025 kg / m³. 3 ; g is the acceleration due to gravity, with a value of 9.80 m / s². 2 ; Q represents the fluid flow rate inside the guide vane seal, in meters per second (m³). 3 ; H represents the effective pressure head, in meters (m). The formula for calculating the fluid flow rate Q inside the guide vane sealing cover is as follows: In the formula: Vc is the fluid velocity inside the guide vane sealing cover, in m / s; Ac is the cross-sectional area inside the guide vane sealing cover, in meters. 2 ; t represents the fluid flow rate and time within the guide vane sealing cover, in seconds; The formula for calculating the effective pressure head H is as follows: Where: h is the height of the wave crest point in front of the inlet duct of the small cross-flow generator, in meters; Vac is the fluid velocity before the inlet duct in a small cross-flow power generation device, in m / s; The formula for calculating the fluid velocity Vac before the above-mentioned inlet pipe is as follows: In the formula: Vt is the propeller wake velocity, in m / s; λ is the energy loss distribution coefficient of the propeller wake in the wake region, and its value ranges from 0.65 to 0.98.