CN110671264B

CN110671264B - Power generation device for collecting wind energy by utilizing pitching-swinging coupled motion of flapping wings

Info

Publication number: CN110671264B
Application number: CN201910863376.8A
Authority: CN
Inventors: 姜伟; 谢诞梅; 岳亚楠; 杜海芬; 梅子岳; 吴凡
Original assignee: Wuhan University WHU
Current assignee: Wuhan University WHU
Priority date: 2019-09-12
Filing date: 2019-09-12
Publication date: 2020-10-13
Anticipated expiration: 2039-09-12
Also published as: CN110671264A

Abstract

The invention relates to a power generation device for collecting wind energy by utilizing pitching-swinging coupled motion of flapping wings, which comprises a rocker arm, wherein the upper part of the rocker arm is hinged with a telescopic device, the lower part of the rocker arm is provided with a cylinder structure which is matched with the rocker arm to swing back and forth, and a sealed chamber is arranged in the cylinder structure; the flapping wing is movably sleeved at the upper part of the rocker arm, and the other end of the telescopic device is hinged with one side edge of the flapping wing; and the magnetofluid generator comprises a C-shaped permanent magnet, a magnetofluid of a magnetic field arranged opposite to the C-shaped permanent magnet and an electrode connected with the magnetofluid through a circuit, the C-shaped permanent magnet is sleeved outside the cylinder structure, the magnetofluid is arranged in the cavity and cuts the magnetic field generated by the C-shaped permanent magnet in the process of rotating back and forth along with the cylinder structure so as to generate voltage and current, and the voltage and the current are output through the electrode. The wind power generation device is simple and compact in structure, and can provide main power to generate electricity through wind energy, so that energy is saved, and effective power generation can be realized.

Description

Power generation device for collecting wind energy by utilizing pitching-swinging coupled motion of flapping wings

Technical Field

The invention relates to the technical field of power generation devices, in particular to a power generation device for collecting wind energy by utilizing pitching-swinging coupled motion of flapping wings.

Background

With the population growth, economic development and social progress, people have increasingly growing demand for energy, but traditional fossil energy is gradually exhausted, and the exploitation cost and price of the traditional fossil energy are gradually increased. The exploitation of renewable energy is therefore the subject of energy development today and for a considerable time in the future. Renewable energy sources include solar energy, wind energy, water energy (specifically river water energy), ocean energy and the like, wherein the wind energy is the second largest renewable energy source next to the solar energy, and the renewable energy sources have huge content and potential for large-scale development and utilization. The global wind energy storage is about 2.84 trillion, wherein the available amount is about 600 hundred million kW, which is about 10 times larger than the total amount of water energy which can be developed and utilized on the earth. The wind energy reserves in the world and China are huge, and the wind energy reserves are renewable energy sources which occupy the largest proportion and grow fastest at present. However, the actual utilization of wind energy is only a small part of the reserves, wherein the available wind energy resources account for less than 10% of the global wind energy reserves.

At present, human beings mainly use wind energy based on traditional rotating turbomachinery, and the rotating turbomachinery has obvious advantages in conversion and utilization of high-quality fluid kinetic energy. However, the fluid kinetic energy conversion technical means and equipment based on the traditional rotating turbine machinery also have certain limitations: the rotary wing fan has economic benefits only in a stable high-speed wind field, and the existing fan can only collect wind energy close to the ground and a layer of sea level; due to the fact that the wing tip speed of the large-diameter fan is high, the noise of the large-diameter fan can cause the large-diameter fan to be installed in an unmanned area only, and the large-scale wind power plant can even affect the migration of birds. These drawbacks of the rotary wing wind turbine limit the deep exploitation and utilization of wind energy, especially high altitude wind energy, by human beings. The development and utilization of high-altitude wind energy face huge technical challenges, and the development of efficient and compact power generation devices suitable for high-altitude wind energy collection gradually becomes the focus of attention of academic and engineering circles.

Disclosure of Invention

The invention aims to provide a power generation device for collecting wind energy by utilizing the pitching-swinging coupled motion of flapping wings, which can collect the wind energy to generate power and has compact structure and can effectively generate the power.

The scheme adopted by the invention for solving the technical problems is as follows:

a power plant for harnessing wind energy from the pitch-roll coupled motion of an ornithopter, comprising:

the rocker arm is hinged with a telescopic device at the upper part thereof, the lower part of the rocker arm is provided with a cylinder structure which is matched with the rocking motion of the rocker arm to rotate clockwise or anticlockwise, the cylinder structure comprises a first arc push rod fixedly connected with the lower part of the rocker arm, a second arc push rod fixedly connected with the lower part of the rocker arm and arranged back to back with the first arc push rod, and a cylinder body connected with the first arc push rod and the second arc push rod, the first arc push rod, the cylinder body and the second arc push rod are sequentially connected and enclosed to form an annular structure, the first arc push rod is connected with the cylinder body through a first piston, the second arc push rod is connected with the cylinder body through a second piston, compressible gas is sealed between the end sides of the first piston and the cylinder body far away from the second piston and between the end sides of the second piston and the cylinder body far away from the first piston, the first piston and the second piston are enclosed in the cylinder body to form a cavity with an accommodating space;

the flapping wing is movably sleeved on the upper part of the rocker arm, one end of the telescopic device is hinged with the lower part of the rocker arm, and the other end of the telescopic device is hinged with one side edge of the flapping wing; and

the magnetic fluid generator comprises a C-shaped permanent magnet, a magnetic fluid and an electrode, wherein the magnetic fluid is arranged opposite to the C-shaped permanent magnet and used for cutting a magnetic field generated by the C-shaped permanent magnet, the electrode is connected with the magnetic fluid through a circuit, the C-shaped permanent magnet is sleeved at the position, corresponding to the magnetic fluid, outside the cylinder body, the magnetic fluid is arranged in the cavity of the cylinder structure and cuts the magnetic field generated by the C-shaped permanent magnet along with the cylinder structure in the process of clockwise or anticlockwise rotation so as to generate voltage and current, and the voltage and the current are output through the electrode.

Furthermore, the telescopic device comprises a hydraulic rod hinged with the rocker arm and the flapping wing respectively and a hydraulic oil pump connected with the hydraulic rod through an integrated oil path and a hose, and the hydraulic oil pump is arranged on the foundation.

Further, the chamber is arranged such that the sectional area thereof is gradually reduced from both ends to the middle, and the C-shaped permanent magnet is arranged at the corresponding position in the middle of the chamber.

Furthermore, the first arc push rod, the cylinder body and the second arc push rod enclose a central shaft of an annular structure formed by closing, and the central shaft is hinged with the bottom end of the rocker arm.

Furthermore, a through hole is formed in the upper portion of the rocker arm, a round shaft on the flapping wing penetrates through the through hole so that the flapping wing is sleeved on the rocker arm, and the inner diameter of the through hole is larger than the outer diameter of the round shaft on the flapping wing.

Compared with the prior art, the invention has at least the following beneficial effects:

1) the high-altitude wind energy is collected through the flapping wings, the rocker arm is driven by wind force acting on the flapping wings to rotate anticlockwise, so that the rocker arm pushes the magnetic fluid to flow anticlockwise to cut the magnetic field in the swinging process, part of mechanical energy is converted into potential energy of gas in the first gas chamber and the second gas chamber, the potential energy is stored when the rocker arm rotates anticlockwise and is released when the rocker arm rotates clockwise, and the magnetic fluid is pushed again to flow clockwise to cut the magnetic field under the combined action of aerodynamic torque acting on the rocker arm and elastic torque exerted by compressed gas in the first gas chamber and the second gas chamber in the releasing process, so that the magnetic fluid cuts the strong magnetic field formed by the C-shaped permanent magnet in the chamber back and forth in one period to generate voltage and current so as to realize the power generation function; the wind power generation device is simple and compact in structure, and can provide main power to generate electricity through wind energy, so that energy is saved, and effective electricity generation can be realized;

2) the power generation device for collecting high-altitude wind energy by utilizing the pitching-swinging coupled motion of the flapping wings transfers the electromechanical conversion part of the wind power device to the ground, so that the weight of the wind power device in the air is greatly reduced, the integral manufacturing cost of the device is not obviously increased when the length of the rocker arm is increased, and the power generation device can collect wind energy at a higher altitude;

3) the magnetofluid generator is improved aiming at the swinging motion of the rocker arm, the first arc-shaped push rod, the second arc-shaped push rod and the cylinder body are enclosed to form an annular structure, the bottom end of the rocker arm is hinged with a central shaft of the annular structure, and magnetofluid is arranged in the cylinder body, namely the magnetofluid generator can cut a magnetic field of the C-shaped permanent magnet to generate electric energy through the motion of the first arc-shaped push rod and the second arc-shaped push rod without converting rotation into linear motion.

Drawings

FIG. 1 is a schematic structural diagram of a power generation device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a cylinder structure and a magnetohydrodynamic generator according to an embodiment of the invention;

FIG. 3 is a schematic structural view of a cylinder structure according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a movement process of a power generation device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of another movement process of the power generation device according to the embodiment of the invention.

Detailed Description

The following examples are provided to further illustrate the present invention for better understanding, but the present invention is not limited to the following examples.

As shown in fig. 1, the invention provides a power generation device for collecting wind energy by using pitch-roll coupled motion of flapping wings, which comprises a rocker arm 1, a cylinder structure, a flapping wing 3 and a magnetofluid power generation device. The upper portion of the rocker arm 1 is hinged with a telescopic device, in this embodiment, the telescopic device can be a hydraulic rod 50 with one end hinged with the upper portion of the rocker arm 1 and a hydraulic oil pump 53 connected with the hydraulic rod 50 through an integrated oil path 51 and a hose 52, here, the hose 52 is connected with the hydraulic oil pump 53 because the hose 52 has a certain degree of freedom and telescopic capability, so that the arrangement of the telescopic device can ensure that the movement of the rocker arm 1 is not limited when the angle between the hydraulic rod 50 and the rocker arm 1 is changed. The lower part of the rocker arm 1 is provided with a cylinder structure which is matched with the rocking motion of the rocker arm to rotate clockwise or anticlockwise.

Referring to fig. 2 and 3, the cylinder structure includes a first arc push rod 20 fixedly connected to the lower portion of the rocker arm 1, a second arc push rod 21 fixedly connected to the lower portion of the rocker arm 1 and disposed opposite to the first arc push rod 20, and a cylinder 22 connected to the first arc push rod 20 and the second arc push rod 21, the first arc push rod 20, the cylinder 22, and the second arc push rod 21 enclose to form an annular structure, the first arc push rod 20 and the second arc push rod 21 are further connected to a central shaft 24 of the annular structure through a connecting rod, the central shaft 24 passes through a circular hole on a base 23 and can rotate around its axis, and the base 23 is fixed on the ground or a support structure on the ground. In order to facilitate the swing motion of the auxiliary rocker arm 1, the bottom end of the rocker arm 1 is hinged to the central shaft 24 of the annular structure, so that the rocker arm 1 can swing around the central shaft 24 when being stressed. Further, the hydraulic oil pump 53 is fixed on the foundation.

The first arc push rod 20 is connected with the cylinder 22 through a first piston 25, the second arc push rod 21 is connected with the cylinder 22 through a second piston 26, a first air chamber 27 is formed between the first piston 25 and the end side, far away from the second piston 26, of the cylinder 22, a second air chamber 28 is formed between the second piston 26 and the end side, far away from the first piston 25, of the cylinder 22, and compressible gas is sealed in the first air chamber 27 and the second air chamber 28. Furthermore, the first piston 25 and the second piston 26 enclose a chamber 29 within the cylinder 22. The magnetofluid power generation device comprises a C-shaped permanent magnet 40 wrapped outside the cylinder body 22, magnetofluid 41 arranged opposite to the C-shaped permanent magnet 40 and used for cutting a magnetic field generated by the C-shaped permanent magnet 40, and an electrode 42 connected with the magnetofluid 41 through a circuit. The magnetic fluid 41 is sealed in a chamber 29 formed by the first piston 25 and the second piston 26 enclosed in the cylinder 22. When the rocker arm 1 is forced to do anticlockwise swinging motion around the axis of the annular structure, the first arc push rod 20 connected with the rocker arm 1 pushes the first piston 25 to do anticlockwise motion in the cylinder 22, the first piston 25 pushes the magnetic fluid 41 in the cavity 29 to flow anticlockwise in the process of the anticlockwise motion so as to cut a magnetic field generated by the C-shaped permanent magnet 40 to generate voltage and current, and the generated voltage and current are output through the electrode 42. Since the second piston 26 disposed in the cylinder 22 also moves counterclockwise under the push of the first piston 25 and the magnetic fluid 41 to compress the gas in the second gas chamber 28, when the above-mentioned force acting on the rocker arm 1 is gradually removed, the compressed gas in the second gas chamber 28 is released to push the second piston 26 to rotate clockwise to push the magnetic fluid 41 in the chamber 29 to rotate clockwise to cut the magnetic field generated by the C-shaped permanent magnet 40 again to generate voltage and current. In order to improve the power generation capacity of the power generation device, the chamber 29 may be configured in a shape in which the sectional area is gradually reduced from the two ends to the middle, that is, the chamber is wide at the two ends and narrow in the middle. In order to further improve the power generation capacity, the middle of the cavity 29 can be provided with a narrow passage 290, and the C-shaped permanent magnet 40 is correspondingly wrapped outside the middle narrow passage 290 of the cavity 29. In order to increase the magnetic field intensity generated by the C-shaped permanent magnet 40, the thickness of the wall of the cylinder 22 should be reduced as much as possible, and the C-shaped permanent magnet 40 should be wrapped on the outer wall of the cylinder 22, so as to reduce the distance from the N pole to the S pole of the C-shaped permanent magnet 40, and further form a stronger magnetic field.

The flapping wings 3 are movably sleeved on the rocker arm 1, specifically, the tail end of the upper part of the rocker arm 1 is provided with a through hole, a round shaft on the flapping wings 3 penetrates through the through hole so that the flapping wings 3 are sleeved on the through hole, and the inner diameter of the through hole is larger than the outer diameter of the round shaft on the flapping wings 3, so that the flapping wings 3 can freely do pitching motion on the rocker arm 1. One side of the flapping wing 3 arranged on the rocker arm 1 is also hinged with the other end of the hydraulic rod 50. Because the rocker arm 1 is hinged with one end of the hydraulic rod 50, and the flapping wing 3 is hinged with the other end of the hydraulic rod 50, the rocker arm 1, the hydraulic rod 50 and the flapping wing 3 can form a triangle, and one side of the triangle (a connecting line between two hinged points) can change the length through the expansion and contraction of the hydraulic rod 50, so that the included angle between the flapping wing 3 and the rocker arm 1 is changed, namely the attack angle of the flapping wing 3 and the thrust of the flapping wing 3 by air are changed. In addition, in order to increase the force of the rocking motion of the rocker arm 1, i.e., the thrust force acting on the first piston 25, a plurality of flapping wings 3 may be provided in parallel on the rocker arm 1 along the longitudinal direction thereof.

When the pitch-roll coupled motion wind energy collection power generation device of the embodiment is applied, the cylinder structure is arranged on the ground, and the rocker arm 1 and the flapping wing 3 on the rocker arm extend into the air. In the initial state, see fig. 4, the included angle between the rocker arm 1 and the vertical direction is the largest, at this time, the flapping wing 3 also keeps a larger attack angle, when wind blows in the air, the flapping wing 3 collects wind energy, the wind force acts on the flapping wing 3 to generate a larger counterclockwise aerodynamic moment to the rocker arm 1, and the rocker arm 1 overcomes the gravity moment of the rocker arm 1 and pushes the first piston 25 and the second piston 26 to rotate counterclockwise under the driving of the moment, so that the gas in the second gas chamber 28 is compressed to make the rocker arm 1 swing counterclockwise. In the process, the first piston 25 rotates counterclockwise to drive the magnetic fluid 41 in the chamber 29 to flow counterclockwise, and in the flowing process of the magnetic fluid 41, due to the special shape of the chamber 29, the magnetic fluid 41 flows through the narrow channel 290 in the middle of the chamber at a high speed so as to cut the strong magnetic field formed by the C-shaped permanent magnet 40 in the chamber 29, and according to the faraday's law of electromagnetic induction, the magnetic fluid 41 in the narrow channel 290 generates a voltage and a current, and the voltage and the current are output through the electrode 42, so that electric energy is output to the outside. The wind power continuously acts on the flapping wings 3 until the attack angle of the flapping wings 3 reaches the maximum value, meanwhile, the aerodynamic moment acting on the rocker arms 1 also reaches the maximum value, at the moment, the hydraulic oil pump 53 drives the hydraulic rods 50 to extend out to push the flapping wings 3 to move in a pitching mode, the attack angle of the flapping wings 3 and the aerodynamic moment acting on the rocker arms 1 are gradually reduced, the included angle between the rocker arms 1 and the vertical direction reaches the minimum value when the moment of reaching the figure 5, and the attack angle of the flapping wings 3 also reaches the minimum value; at this time, the elastic moment of the gas in the second gas chamber 28 reaches a maximum value, the elastic moment of the compressed gas in the second gas chamber 28 acts on the second piston 26 to push the second piston 26 to rotate clockwise, the rocker arm 1 rotates clockwise under the driving of the elastic moment and the gravity moment, in the process, the second piston 26 drives the magnetic fluid 41 in the chamber 29 to flow clockwise, and in the process that the magnetic fluid 41 flows clockwise, the strong magnetic field formed in the chamber 29 by the C-shaped permanent magnet 40 is cut at a high speed through the narrow channel 290 to generate voltage and current. And the flapping wing 3 keeps a very small attack angle most of the clockwise rotation time, so that the aerodynamic moment in the period of time reaches the minimum value, when the included angle between the rocker arm 1 and the vertical direction is close to the maximum value, the hydraulic oil pump 53 rapidly acts to control the hydraulic rod 50 to retract, and when the hydraulic rod 50 retracts, the flapping wing 3 is pulled to a larger attack angle and starts the reciprocating motion of the next wheel.

While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims

1. A power plant for harnessing wind energy from the pitch-roll coupled motion of flapping wings, comprising:

2. The power generation device for collecting wind energy by using the pitch-roll coupled motion of the flapping wings of claim 1, wherein the telescopic device comprises a hydraulic rod hinged with the rocker arm and the flapping wings respectively and a hydraulic oil pump connected with the hydraulic rod through an integrated oil circuit and a hose, and the hydraulic oil pump is arranged on the foundation.

3. The power generation apparatus for capturing wind energy using the pitch-roll coupled motion of flapping wings of claim 1, wherein the chamber is configured such that the sectional area thereof is gradually reduced from both ends to the middle, and the C-shaped permanent magnet is disposed at the middle of the chamber.

4. The power generation device for collecting wind energy by using the pitch-roll coupled motion of the flapping wings of claim 1, wherein the central axis of the annular structure formed by the first arc-shaped push rod, the cylinder body and the second arc-shaped push rod is hinged with the bottom end of the rocker arm.

5. The power generation device for collecting wind energy by using the pitch-yaw coupled motion of the flapping wings of claim 1, wherein the upper portion of the rocker arm is provided with a through hole, a circular shaft on the flapping wing passes through the through hole so that the flapping wing is sleeved on the rocker arm, and the inner diameter of the through hole is larger than the outer diameter of the circular shaft on the flapping wing.