阅读说明：本技术 一种水平轴潮流能水轮机及使用方法 (Horizontal shaft tidal current energy water turbine and using method thereof ) 是由 王文全 王秀 虎周平 闫妍 于 2021-08-11 设计创作，主要内容包括：本发明公开一种水平轴潮流能水轮机及使用方法,包括有叶片和支撑结构,其叶片包括主翼和襟翼,其中,襟翼设置在所述主翼的尾缘处,主翼和所述襟翼之间存在可变面积的透水通道；通过采用主翼和襟翼之间存在透水通道的结构设计,使其能够利用主翼与襟翼之间的透水通道对水流的引射作用增加主翼吸力面尾缘处的流速,达到改善边界层分离的目的；同时有利于减少叶片表面的流动分离现象和能量损失,从而提高叶片的升力和水轮机的能量转换效率；同时,通过透水通道面积可变的结构设计,使其当叶片周围的水流速度增大时,通过调节透水通道的面积,进而增加叶片整体的弯度,增大失速攻角,延缓叶片失速的发生,从而拓宽潮流能水轮机的运行范围。(The invention discloses a horizontal shaft tidal current energy water turbine and a using method thereof, wherein the horizontal shaft tidal current energy water turbine comprises blades and a supporting structure, the blades comprise a main wing and a flap, the flap is arranged at the tail edge of the main wing, and a water permeable channel with a variable area is arranged between the main wing and the flap; by adopting the structural design that the water permeable channel exists between the main wing and the flap, the jet effect of the water permeable channel between the main wing and the flap on water flow can be utilized to increase the flow speed at the tail edge of the suction surface of the main wing, and the purpose of improving the separation of a boundary layer is achieved; meanwhile, the flow separation phenomenon and the energy loss on the surface of the blade can be reduced, so that the lift force of the blade and the energy conversion efficiency of the water turbine can be improved; meanwhile, through the structural design that the area of the water permeable channel is variable, when the water flow speed around the blade is increased, the area of the water permeable channel is adjusted, the integral camber of the blade is increased, the stall attack angle is increased, and the occurrence of the stall of the blade is delayed, so that the operation range of the tidal current energy water turbine is widened.)

1. A horizontal axis tidal current energy water turbine blade is characterized in that: comprising a main wing and a flap, wherein the flap is arranged at the trailing edge of the main wing, and a water-permeable channel of variable area is present between the main wing and the flap.

2. The blade of claim 1, wherein: the main wing and the flap are connected through a driving part; the flap can be deflected around the trailing edge of the main wing by means of the drive member in order to change the camber of the blade.

3. The blade of claim 2, wherein: the drive member is a crank link with one end mounted at 1/3 chord from the leading edge of the main flap tip and the other end mounted at 1/3 chord from the leading edge of the flap tip.

4. The blade of claim 3, wherein: the chord length of the main wing is C1, and the chord length of the flap is C2, C1: c2 ═ 3: 2.

5. the blade of claim 4, wherein: the overlap between the main wing and the flap is L, 8% C1.

6. The blade of claim 5, wherein: the slot width between the main wing and the flap is d, and d is 3% C1.

7. The blade according to any of claims 1-6, wherein: the blades are straight blades or twisted blades.

8. A horizontal axis tidal current energy water turbine is characterized in that: the water turbine comprises a supporting structure and a water turbine installed at the top end of the supporting structure, wherein the water turbine comprises a cabin connected with the supporting structure, a generator installed inside the cabin, a hub connected with the generator shaft, and a plurality of blades which are circumferentially installed on the hub and are as claimed in claim 7, wherein the main wing is fixedly connected with the hub, the flaps are installed on a slideway circumferentially arranged on the hub, and the crank connecting rod is connected with a driving device arranged in the hub.

9. The horizontal axis tidal current energy turbine of claim 8, wherein: the supporting structure is a variable-elliptic-section supporting rod with a small upper part and a large lower part.

10. A use method of a horizontal shaft tidal current energy water turbine is characterized by comprising the following steps: the horizontal-axis tidal current energy water turbine based on claim 9, wherein the use method comprises the following steps:

when the water turbine is in a normal working state, the driving device does not work, at the moment, water flows through the water permeable channel between the main wing and the flap, and the flow velocity of the water flow at the tail edge of the suction surface of the main wing is increased by utilizing the injection action of the water permeable channel on the fluid;

when the blades of the water turbine need to be adjusted, the driving device works, the driving device controls the crank connecting rod to operate, the flap is driven to slide along the slideway on the hub through the crank connecting rod, and the integral camber of the blades is changed to be increased.

Technical Field

The invention relates to the technical field of tidal current energy power generation, in particular to a horizontal shaft tidal current energy water turbine and a using method thereof.

Background

In recent years, with the increasing global population, the consumption of traditional fossil energy such as coal, oil, and natural gas has increased year by year, and effective development and utilization of renewable energy have become important for various countries. The horizontal shaft tidal current energy water turbine is an important device for converting ocean current energy and tidal current energy into electric energy, and the power generation principle of the horizontal shaft tidal current energy water turbine is similar to that of wind power generation, but the horizontal shaft tidal current energy water turbine is higher in energy density and stronger in regularity. Because the horizontal shaft tidal current energy water turbine has the advantages of good controllability, low economic investment, cleanness, no pollution and the like, the horizontal shaft tidal current energy water turbine is widely applied to offshore areas of various countries in the world.

The blade of the horizontal shaft tidal current energy water turbine is formed by overlapping and combining one or more wing profiles along the spanwise direction, so the advantages and disadvantages of the hydrodynamic performance of the wing profiles directly influence the energy utilization efficiency of the horizontal shaft tidal current energy water turbine. Currently, the tidal energy flow rate of most of the water areas in the world does not exceed 2 m/s. Therefore, stall is a major cause of reduced blade capture efficiency under high Reynolds number conditions. Stall causes a series of problems such as the reduction of the lift force of the blade, the increase of the resistance and the generation of blade vibration, and even causes the blade to be broken.

In order to improve the aerodynamic performance of airfoils, a variety of different flow control methods have been employed; technologies that have been implemented in engineering are vortex generators, spoiler droop, synthetic jet, plasma technology, trailing edge flaps and leading edge slats. In recent years, the use of a method (flap) for controlling the flight by changing the feather of the tail of a wing similar to a flying bird in fluid machinery has been attracting more and more attention, for example: the trailing edge flap rocker arm type motion design method disclosed by the Chinese patent (CN106347633A) and the guide slide frame type trailing edge flap motion method disclosed by the Chinese patent (CN107600389A) both disclose trailing edge flaps for improving the wing lift coefficient and reducing the running distance under the takeoff or landing configuration of an airplane.

Based on the above, chinese patent (CN209163987U) discloses a water turbine with an adjustable included angle between a flap and a main wing and a water turbine power generation system, which uses a flap structure on an aircraft to generate power with the water turbine, thereby improving the power generation efficiency. In practice, although the power generation efficiency can be improved to a certain extent, the main wing and the rotatable flap are in hinged connection, but certain restriction is generated, so that the efficiency cannot be maximized.

Therefore, in order to further improve the power generation efficiency of the horizontal axis tidal current energy water turbine, the structural design of the horizontal axis tidal current energy water turbine needs to be improved.

Disclosure of Invention

The invention aims to solve the technical problems and provides a horizontal shaft tidal current energy water turbine and a using method thereof, wherein blades of the horizontal shaft tidal current energy water turbine are improved to improve the power generation efficiency of the water turbine.

In order to achieve the purpose, the invention provides the following scheme:

a horizontal axis tidal current energy water turbine blade is provided, which comprises a main wing and a flap, wherein the flap is arranged at the tail edge of the main wing, and a water permeable channel with variable area is arranged between the main wing and the flap.

Preferably, the main wing and the flap are connected by a drive member; the flap can be deflected around the trailing edge of the main wing by means of a drive member to change the camber of the blade.

Preferably, the drive member is a crank link with one end mounted at 1/3 chord length from the leading edge of the main flap tip and the other end mounted at 1/3 chord length from the leading edge of the flap tip.

Preferably, the chord length of the main wing is C1, the chord length of the flap is C2, C1: c2 ═ 3: 2.

preferably, the overlap between the main wing and the flap is L, which is 8% C1.

Preferably, the slot width between the main wing and the flap is d, which is 3% C1.

Preferably, the blades are straight blades or twisted blades.

Still provide a horizontal axis trend can hydraulic turbine, include bearing structure and install the hydraulic turbine at the bearing structure top, wherein, the hydraulic turbine includes the cabin of being connected with bearing structure, installs the generator in cabin inside, is connected wheel hub and circumference with the generator shaft and installs the blade of the above-mentioned scheme of a plurality of on wheel hub, wherein, main wing and wheel hub fixed connection, the flap is installed on the slide that wheel hub circumference set up, the crank connecting rod is connected with the drive arrangement who sets up in the wheel hub.

Preferably, 3-5 blades are provided.

Preferably, the support structure is a support bar with a variable elliptical cross section with a small top and a large bottom.

Based on the horizontal shaft tidal current energy water turbine, the use method comprises the following steps:

when the water turbine is in a normal working state, the driving device does not work, at the moment, water flows pass through the water permeable channel between the main wing and the flap, and the flow velocity of the water flows at the tail edge of the suction surface of the main wing is increased by utilizing the injection action of the water permeable channel on the fluid;

when the blades of the water turbine need to be adjusted, the driving device works, the driving device controls the crank connecting rod to operate, the flap is driven by the crank connecting rod to slide along the slideway on the hub, and the integral camber of the blades is changed to be increased.

Compared with the prior art, the invention has the following technical effects:

(1) the invention adopts the structural design that the water permeable channel exists between the main wing and the flap, so that the flow velocity at the tail edge of the suction surface of the main wing can be increased by utilizing the injection effect of the water permeable channel between the main wing and the flap on water flow, and the aim of improving the boundary layer separation is fulfilled; meanwhile, the flow separation phenomenon and the energy loss on the surface of the blade are reduced, the pressure on the lower surface of the blade is increased, and the pressure difference between the upper surface and the lower surface of the blade is increased, so that the lift force of the blade and the energy conversion efficiency of the water turbine are improved.

(2) The variable-area structure design of the water permeable channel is adopted, so that when the water flow speed around the blade is increased, the integral camber of the blade is increased, the stall attack angle is increased, the occurrence of blade stall is delayed, and the operating range of the tidal current energy water turbine is widened.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic cross-sectional view of a blade according to the present invention;

FIG. 2 is a schematic view of the parameters between the main wing and the flap of the invention;

FIG. 3 is a partial enlarged view of the area of FIG. 2A;

FIG. 4 is a schematic structural diagram of a water turbine according to the present invention;

FIG. 5 is a partial enlarged view of the area of FIG. 4B;

wherein, 1-blade, 11-main wing, 12-flap, 13-crank connecting rod, 2-hub, 3-cabin, 4-supporting structure.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a horizontal shaft tidal current energy water turbine and a using method thereof, wherein blades of the horizontal shaft tidal current energy water turbine are improved to improve the power generation efficiency of the water turbine.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The first embodiment is as follows:

as shown in fig. 1 to 5, the present embodiment provides a horizontal axis tidal current energy turbine blade 1 including a main wing 11 and a flap 12, wherein the flap 12 is provided at a trailing edge of the main wing 11, and a water permeable passage of variable area exists between the main wing 11 and the flap 12.

Further, as shown in fig. 1, the main wing 11 and the flap 12 are connected by a crank link 13, wherein one end of the crank link 13 is installed at 1/3 chord length from the front edge of the tip of the main wing 11, and the other end is installed at 1/3 chord length from the front edge of the tip of the flap 12; the flap 12 can be deflected around the trailing edge of the main wing 11 by means of a crank link to change the camber of the blade 1. It should be noted that the connection between the main wing 11 and the flap 12 is not limited to the connection via the crank link 13, but may also be via other drive components, such as: the blades are connected through the telescopic arc-shaped rods, the fixed ends of the arc-shaped rods are connected with the main wing 11, the telescopic ends of the arc-shaped rods are connected with the flap 12, and the camber of the blades 1 is changed by controlling the extension and retraction of the arc-shaped rods.

Further, as shown in fig. 2 and 3, when the chord length of the main wing 11 is C1 and the chord length of the flap 12 is C2, C1: c2 ═ 3: 2; the lapping amount between the main wing 11 and the flap 12 is L, and then L is 8% C1; the slot width between the main wing 11 and the flap 12 is d, which is 3% C1.

By adopting the structural design that a water permeable channel exists between the main wing 11 and the flap 12, the flow velocity at the tail edge of the suction surface of the main wing 11 can be increased by utilizing the injection effect of the water permeable channel between the main wing 11 and the flap 12 on water flow under water, so that the aim of improving the boundary layer separation is fulfilled; meanwhile, the flow separation phenomenon and the energy loss on the surface of the blade 1 can be reduced, the pressure on the lower surface of the blade 1 is increased, and the pressure difference between the upper surface and the lower surface of the blade 1 is increased, so that the lift force of the blade 1 and the energy conversion efficiency of a water turbine are improved; meanwhile, the area of the water permeable channel of the tidal current energy water turbine is variable through the control of the crank connecting rod 13, so that in practice, when the water flow speed around the blade 1 is increased, the area of the water permeable channel is adjusted, the integral camber of the blade 1 is increased, the stall attack angle is increased, the stall of the blade 1 is delayed, and the operation range of the tidal current energy water turbine is widened.

Example two:

as shown in fig. 4 to 5, the present embodiment provides a horizontal axis tidal current energy water turbine, which includes a support structure 4 and a water turbine installed on the top end of the support structure 4, wherein the water turbine includes a nacelle 3 connected with the support structure 4, a generator (not shown) installed inside the nacelle 3, a hub 2 connected with the generator shaft, and a plurality of blades 1 of the embodiment installed on the hub circumferentially, wherein a main wing 11 is fixedly connected with the hub 2, a flap 12 is installed on a slideway arranged on the hub 2 circumferentially, and a crank connecting rod 13 is connected with a driving device (not shown) arranged in the hub 2; the turbine is directly fixed to the seabed by means of a support structure 4.

When the wind power generator works, the water flow drives the blades 1 to rotate, further drives the hub 2 connected with the blades 1, and drives the generator in the engine room 3 to generate electricity through the rotation of the hub 2; when the blade 1 needs to be adjusted, the driving device of the hub 2 operates to drive the connecting shaft of the crank connecting rod 13 to rotate, so that the flap 12 slides along the slideway arranged on the circumference of the hub 2, and the adjustment of the blade 1 is realized.

Further, 3 to 5 blades 1 are provided, and 3 blades are selected in this example.

Furthermore, the supporting structure 4 is a variable-elliptic-section structure with a small upper part and a large lower part, so that the stability of the supporting structure 4 can be improved and the integral anti-overturning capability of the water turbine can be improved in practice.

By adopting the structural design that a water permeable channel exists between the main wing 11 and the flap 12, the flow velocity at the tail edge of the suction surface of the main wing 11 can be increased by utilizing the injection effect of the water permeable channel between the main wing 11 and the flap 12 on water flow under water, so that the aim of improving the boundary layer separation is fulfilled; meanwhile, the flow separation phenomenon and the energy loss on the surface of the blade 1 can be reduced, the pressure on the lower surface of the blade 1 is increased, and the pressure difference between the upper surface and the lower surface of the blade 1 is increased, so that the lift force of the blade 1 and the energy conversion efficiency of a water turbine are improved; meanwhile, the area of the water permeable channel of the tidal current energy water turbine is variable through the control of the crank connecting rod 13, so that in practice, when the water flow speed around the blade 1 is increased, the area of the water permeable channel is adjusted, the integral camber of the blade 1 is increased, the stall attack angle is increased, the stall of the blade 1 is delayed, and the operation range of the tidal current energy water turbine is widened.

Example three:

based on the horizontal-axis tidal current energy water turbine provided in the second embodiment, the specific use method provided in the second embodiment is as follows:

when the water turbine is in a normal working state, the driving device does not work, at the moment, water flows through a water permeable channel between the main wing 11 and the flap 12, and the flow velocity of the water flow at the tail edge of the suction surface of the main wing 11 is increased by utilizing the injection action of the water permeable channel on the fluid;

when the blades of the water turbine need to be adjusted, the driving device works, the driving device controls the crank connecting rod 13 to operate, and the flap 12 is driven by the crank connecting rod 13 to slide along the slideway on the hub 2, so that the integral curvature of the blades 1 is increased.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.