阅读说明：本技术 尾流激振的覆冰形能量采集器 (Ice-coated energy collector adopting wake excitation ) 是由 颜志淼 谭婷 于 2020-07-29 设计创作，主要内容包括：一种尾流激振的覆冰形能量采集器,包括：绕流质量块和覆冰形质量块,二者通过移动式夹具活动设置于固定支架的滑槽上；所述的覆冰形质量块与移动式夹具之间设有悬臂梁,该悬臂梁上设有压电纤维片。本发明结构简单、设计合理、使用方便。利用固体绕流理论,向覆冰形质量块提供包含旋涡的复杂流场,增大了覆冰形质量块的振动幅值,提高了风能利用率；利用不同于常规形状等质量的覆冰形质量块,进一步提高了对风能的采集效率,增大了可利用的风速范围；本压电能量采集器可以与其他压电能量采集器同时使用,或大规模阵列布置,以最大化采集风能。(A wake-excited icing shaped energy harvester comprising: the streaming mass block and the icing mass block are movably arranged on a sliding chute of the fixed bracket through a movable clamp; a cantilever beam is arranged between the ice-coated mass block and the movable fixture, and a piezoelectric fiber sheet is arranged on the cantilever beam. The invention has simple structure, reasonable design and convenient use. By utilizing the solid streaming theory, a complex flow field containing vortexes is provided for the ice-coated mass block, the vibration amplitude of the ice-coated mass block is increased, and the wind energy utilization rate is improved; the icing-shaped mass block with the mass different from the mass of the conventional shape and the like is utilized, the wind energy collection efficiency is further improved, and the available wind speed range is enlarged; the piezoelectric energy collector can be used with other piezoelectric energy collectors at the same time or arranged in a large-scale array mode so as to collect wind energy to the maximum extent.)

1. An icing-shaped energy harvester excited by wake flow is characterized by comprising: the streaming mass block and the icing mass block are movably arranged on a sliding chute of the fixed bracket through a movable clamp; a cantilever beam is arranged between the ice-coated mass block and the movable clamp, and a piezoelectric fiber sheet is arranged on the cantilever beam;

the cross section of the ice-coated mass block is elliptical, and the minor axis direction of the ice-coated mass block is perpendicular to the direction of incoming wind.

2. The wake-excited icing-shaped energy harvester of claim 1, wherein a cantilever beam is arranged between the icing-shaped mass block and the movable fixture, and a piezoelectric fiber sheet is arranged on the cantilever beam.

3. The wake-excited icing-shaped energy harvester according to claim 1, characterized in that the distance between the streaming mass block and the icing-shaped mass block is adjusted according to the wind speed, and the adjustment mode comprises two directions of the downwind direction and the crosswind direction.

4. The wake-excited icing-shaped energy harvester according to claim 1, characterized in that the sum of the effective lengths of the cantilever beam and the icing-shaped mass block is equal to the effective length of the streaming mass block, i.e. the distance between the lower edge of the mass block and the lower edge of the chute of the fixed bracket.

5. The wake-excited icing-shaped energy harvester according to claim 1, wherein the fixing bracket comprises: the top plate and four support legs arranged on the top plate, the sliding groove is formed in the top plate in a direct cutting mode, and moving space is provided for the limiting device, the movable clamp and connected parts of the movable clamp.

6. The wake-excited icing-shaped energy harvester adopting the wake flow as claimed in claim 1 or 4, wherein the windward widths of the streaming mass block and the icing mass block are 30mm, the effective length of the streaming mass block is 500mm, the effective length of the icing mass block is 400mm, and the sum of the effective lengths of the cantilever beam and the icing mass block is equal to the effective length of the streaming mass block.

7. The wake-excited icing-shaped energy harvester excited by the wake flow as claimed in claim 1, wherein the two sides of the upper end of the streaming mass block are cut by 10mm along the radial direction towards the center of a circle, and the axial length of the streaming mass block is 10mm, so that two symmetrical planes are formed for positioning and fixing the movable fixture.

8. The wake-excited icing-shaped energy harvester adopting the wake excitation as set forth in claim 1, wherein threaded holes are symmetrically formed in two sides of the icing-shaped mass block so that a jackscrew can be conveniently connected with the cantilever beam and the icing-shaped mass block.

9. The wake-excited icing-shaped energy harvester of claim 5, wherein the width of the slot is 1mm, the length thereof is 21mm, and the depth thereof is 20 mm; the height of the fixed support is more than 1.5 times of the effective length of the streaming mass block so as to avoid the influence of the boundary.

10. The wake-excited icing-shaped energy harvester of claim 1, wherein the length of the cantilever beam and the inserted movable fixture is 10mm, the effective length of the cantilever beam is 100mm, and the piezoelectric fiber sheet is fixed in the middle of the effective length of the cantilever beam.

Technical Field

The invention relates to a technology in the field of piezoelectric energy collection, in particular to an ice-coated energy collector adopting wake excitation.

Background

With the development of science and technology, the technologies such as novel materials, nanotechnology, integrated electronics and the like are rapidly developed, the size of electronic devices is smaller and smaller, the energy consumption is reduced, and the energy supply problem of the equipment becomes a research hotspot at home and abroad. The piezoelectric energy collection technology is a technology for converting energy in nature into electric energy by using piezoelectric materials, and can effectively collect wind energy so as to supply power to microelectronic equipment. The global wind energy is about 1300 hundred million kilowatts, which is 10 times larger than the total amount of water energy which can be developed and utilized on the earth, and the development and utilization of the wind energy by human beings are at a lower level at present. The wind energy can be continuously and effectively converted into electric energy by utilizing an energy acquisition technology, the self-powered driving and control of sensor devices in areas such as mountainous areas, coastlines, offshore oil wells and the like can be realized, the flexibility is very high, the era background of green sustainable development is met, and the method has wide application prospects in the fields of public facilities, environmental monitoring, military reconnaissance and the like. In cold winter, the overhead cable is usually coated with ice, and can vibrate more violently than a common cable after being affected by wind, so that the tower line structure is threatened greatly. The existing wind energy collector has the defects of low conversion efficiency, small effective utilization wind speed range and the like, the wind energy is not fully utilized, the power generation stage is too concentrated, and the application in practical occasions is not facilitated.

The Chinese patent document No. CN110118935A discloses a piezoelectric energy collector testing device under wake flow interference, which comprises water tanks capable of providing water flows with different flow rates, an end mass block and a spoiler mass block are erected to invade water, a piezoelectric fiber sheet is arranged on one side of the end mass block, and then an external resistance box and a voltage testing device are connected.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the ice-coated energy collector adopting wake excitation, and the ice-coated cylinder under the action of the barrier wake is utilized, so that the output power can be increased, and the working efficiency of the energy collector can be improved.

The invention is realized by the following technical scheme:

the invention relates to an icing-shaped energy collector adopting wake excitation, which comprises: and the streaming mass block and the icing mass block are movably arranged on a sliding chute of the fixed support through the movable clamp.

The cross section of the ice-coated mass block is elliptical, the minor axis direction of the ice-coated mass block is perpendicular to the incoming wind direction, the aerodynamic lift force borne by the mass block is increased through the aerodynamic shape, and the energy collection efficiency is increased.

A cantilever beam is arranged between the ice-coated mass block and the movable fixture, and a piezoelectric fiber sheet is arranged on the cantilever beam.

The distance between the streaming mass block and the ice-coated mass block is adjusted according to the wind speed, and the adjustment mode of the distance can be divided into adjustment along the downwind direction and adjustment along the crosswind direction.

The sum of the effective lengths of the cantilever beams and the ice-coated mass block is equal to the effective length of the bypass mass block, namely the distance between the lower edge of the mass block and the lower edge of the chute of the fixed support.

Technical effects

The invention obviously improves the output efficiency of the wake excitation energy collector under the same incoming flow wind speed. Compared with the prior art, the invention can realize the staggered arrangement of the icing mass blocks and the turbulent mass blocks and also realize the staggered arrangement of the icing mass blocks and the turbulent mass blocks. In addition, the appearance of the icing mass block is the pneumatic appearance of the icing conductor under the natural condition, and compared with the pneumatic appearance mass block with the conventional section form, the appearance mass block can increase the vibration amplitude of the energy collector and improve the energy collecting efficiency.

Compared with the prior art, the invention has the advantages of simple structure, reasonable design and convenient use. By utilizing the solid streaming theory, a complex flow field containing vortexes is provided for the ice-coated mass block, the vibration amplitude of the ice-coated mass block is increased, and the wind energy utilization rate is improved; the icing-shaped mass block with the mass different from the mass of the conventional shape and the like is utilized, the wind energy collection efficiency is further improved, and the available wind speed range is enlarged; the piezoelectric energy collector can be used with other piezoelectric energy collectors at the same time or arranged in a large-scale array mode so as to collect wind energy to the maximum extent.

Drawings

FIG. 1 is a horizontal cross-sectional view of a mass flow-around block according to the present embodiment;

FIG. 2 is a cross-sectional view of an ice-coated mass of the present embodiment;

FIG. 3 is a front view of a piezoelectric energy harvester testing device under wake excitation according to the embodiment;

fig. 4 is a top view and a cross-sectional view of a piezoelectric energy harvester testing device under wake excitation according to the embodiment;

in the figure: the device comprises a streaming mass block 1, an ice-coated mass block 2, a cantilever beam 3, a piezoelectric fiber sheet 4, a fixed support 5, a movable clamp 6, a top plate 7, a chute 8 and a slot 9.

Detailed Description

As shown in fig. 1, the present embodiment includes: the mass flow winding block 1 and the ice-coated mass block 2 are movably arranged on a sliding chute 8 of a fixed bracket 5 in a front-back tandem manner through a movable clamp 6.

The slot 9 on the ice-coated mass block 2 is fixed with the cantilever beam 3 through a jackscrew and then connected with the movable fixture 6.

The cantilever beam 3 is provided with a piezoelectric fiber sheet 4, and the output end of the piezoelectric fiber sheet 4 is welded with an electric wire so as to transmit the collected electric energy to an electric device or store the electric energy for later use.

The distance between the streaming mass block 1 and the ice-coated mass block 2 is adjusted according to the wind speed to obtain the maximum power.

The fixing bracket 5 includes: the top plate 7 and the four legs provided thereon can be provided at any place as required.

The movable clamp 6 is provided with a limiting device to regulate and control the relative position and the absolute position of the two mass blocks.

The sliding groove 8 is preferably formed in the top plate 7 by direct cutting, and provides a moving space for the limiting device, the movable clamp and the connected components of the movable clamp.

Two holes are uniformly distributed on the supporting legs so as to be convenient for installation and fixation.

The windward widths of the streaming mass block 1 and the icing mass block 2 are 30mm, the effective length of the streaming mass block 1 is 500mm, the effective length of the icing mass block 2 is 400mm, and the sum of the effective lengths of the cantilever beam 3 and the icing mass block 2 is equal to the effective length of the streaming mass block 1.

The two sides of the upper end of the streaming mass block 1 are cut by 10mm along the radial direction towards the circle center, and the axial length is 10mm, so that two symmetrical planes are formed for positioning and fixing the movable clamp 6.

The two sides of the ice-coated mass block 2 are symmetrically provided with threaded holes so that the jackscrews can be conveniently connected with the cantilever beam 3 and the ice-coated mass block 2.

The width of the slot 9 is 1mm, the length thereof is 21mm, and the depth thereof is 20 mm.

The height of the fixed support 5 is more than 1.5 times of the effective length of the streaming mass to avoid the influence of the boundary.

The length of the cantilever beam 3 and the inserted movable fixture 6 is 10mm, the effective length of the cantilever beam 3 is 100mm, and the piezoelectric fiber piece 4 is fixed in the middle of the effective length of the cantilever beam 3.

The effective length is the distance between the upper edge of the mass block and the lower edge of the fixed support sliding groove.

Each part of this embodiment adopts the stainless steel to make, adopts threaded connection between each part.

The streaming mass block 1 is placed on the windward side as a barrier, and provides wake flow for the ice-coated mass block 2 on the leeward side under the action of solid streaming, and due to fluid viscosity and a blocking effect, the wake flow can generate high-speed vortex, provides larger lift force to drive the ice-coated mass block 2 to generate vibration with larger displacement amplitude, and the piezoelectric energy collector can generate larger voltage under the same wind speed condition. The lower end of the cantilever beam 3 is inserted into the slot 9 of the ice-coated mass block 2, and the movable clamp 6 capable of sliding is placed in the sliding groove 8 after clamping the upper end of the cantilever beam 3.

Compared with the prior art, the icing-shaped mass block 2 used by the invention is optimized on the basis of fluid mechanics and energy collection, and can collect larger electric energy than a single cylindrical mass block or a tandem cylindrical mass block. Through the improvement of the cross section of the cylindrical streaming and energy collection cylinder, on one hand, the energy collection cylinder is optimized, and the aerodynamic lift force on the mass block is improved, so that the output voltage and power are increased, the characteristics of limited frequency locking and vibration wind speed range of the cylindrical mass block are avoided, and the output voltage is obviously increased along with the wind speed; on the other hand, a vortex wind field is obtained under the condition of limited natural wind by utilizing the cylindrical streaming theory, periodically, vortices alternately pass through the mass block, the mass block is subjected to the action of large alternating force under the action of large wind pressure difference, vibration is further increased, and more wind energy is collected. To sum up: the piezoelectric energy collector can improve output power, collects energy contained in higher wind speed, is suitable for different environments, overcomes the defects of low collection efficiency and limited power generation wind speed range of the conventional piezoelectric energy collector, and can improve the utilization rate by array arrangement.

For the device of the invention to carry out wind tunnel experiments in wind tunnels, the output power of the energy collector of the invention is 63 times of that of the traditional energy collector device with a circular section shape.

Compared with the prior art, the device increases the aerodynamic lift force borne by the energy collector through the wake effect of the upstream cylinder and the special aerodynamic shape of the downstream energy collector, and increases the vibration amplitude of the energy collector, so that the output power of the energy collector is increased.

The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.