A wind turbine blade configured with a liquid damper and a method of manufacturing the same

Abstract

The application discloses a wind power blade provided with liquid dampers and a preparation method thereof. In a section 10-20 m away from a blade tip, 10-20 fish-shaped sheet liquid dampers are arranged in series along an inner cavity axis of the blade, and the fish-shaped sheet liquid dampers are equivalent to replace original blade webs in the section. The fish-shaped sheet liquid dampers and the blade skin and the fish-shaped sheet liquid dampers are bonded together by structural glue. The fish-shaped sheet liquid dampers are fish-shaped cross-section sheet prefabricated parts, the outer contour of which is the inner cavity clearance size of the blade airfoil cross-section, and the fish-shaped sheet liquid dampers are internally provided with flow guide partition plates perpendicular to blade chord lines, and the flow guide partition plates divide the inner cavity of the fish-shaped sheet liquid dampers into zigzag and circuitous elongated damping liquid flow channels. The blade provided with the liquid dampers can effectively suppress the vibration in the swing direction of the blade in the running and shutdown states of the blade.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power generation, in particular to a wind power blade with liquid dampers and a preparation method thereof. BACKGROUND

[0002] Modern wind turbines have a sharp increase in capacity, and the length of the blade has broken through the level of hundreds of meters. The blade is a flexible cantilever beam structure, and the structural vibration problem of the blade often troubles the operation of the wind turbine, which bears a huge risk.

[0003] At present, there are two technical routes for suppressing blade vibration, namely aerodynamic damping and structural damping. Each technical route has active control and passive control damping mechanisms, but each has various advantages and disadvantages, and the practicability is limited to a certain extent.

[0004] The eddy current mass tuned damper of the prior art can solve the vibration problem of the blade in the direction of the pendulum vibration to a certain extent. However, it cannot achieve lifelong maintenance, and can only be used in the inner cavity of the root of the blade. The modal mass at this position is large, so the damping efficiency is poor, and a large number of dampers and high costs are required. SUMMARY

[0005] The present application aims to overcome the shortcomings and deficiencies of the prior art, and provides a wind power blade with liquid dampers and a preparation method thereof. The damper structure and the blade bearing structure are designed integrally, and are installed and used at the tip section, so that high-efficiency damping, low cost and lifelong maintenance can be achieved.

[0006] To achieve the above-mentioned purpose, the technical scheme provided by the present application is as follows: a wind power blade with liquid dampers, N fish-shaped sheet liquid dampers are arranged in series along the axial direction of the inner cavity of the blade in a section 10-20 m away from the blade tip, N is 10-20, and the fish-shaped sheet liquid dampers are stacked between each other in the form of a sheet, and are arranged in the form of an array along the span direction of the blade. The shape and size of each fish-shaped sheet liquid damper are consistent with the cavity space in the section, so as to be embedded in the inner cavity of the blade. The N fish-shaped sheet liquid dampers are equivalent to replace the original blade web in the section; the fish-shaped sheet liquid dampers and the blade skin, and the fish-shaped sheet liquid dampers between each other are adhesively connected by structural adhesive; the fish-shaped sheet liquid damper is a fish-shaped cross-section sheet-shaped prefabricated part with a thickness of 50-150 mm, and the outer contour is the inner cavity clearance size of the blade airfoil cross-section; the fish-shaped sheet liquid damper is provided with a flow guide partition plate perpendicular to the chord line of the blade, and the flow guide partition plate divides the inner cavity of the fish-shaped sheet liquid damper into a tortuous and winding elongated damping liquid flow channel, so as to prolong the flow length of the damping liquid between the leading edge and the trailing edge of the blade.

[0007] Preferably, the fish-shaped piece liquid damper has a turbulence body or a porous material damping filling body in the damping liquid flow channel.

[0008] Preferably, the fish-shaped piece liquid damper is at least one of the following three structures or a combination of two or more of the following three structures: no filling body in the flow channel, a mesh plate turbulence body in the flow channel, and a porous material damping filling body in the flow channel.

[0009] Preferably, the flow guide partition plates are arranged in a staggered and spaced manner along the chord direction of the fish-shaped piece liquid damper; one end of the flow guide partition plate is connected to the PS surface fish shell of the closed fish-shaped outer shell of the fish-shaped piece liquid damper, and the other end is reserved with a gap between the SS surface fish shell of the closed fish-shaped outer shell of the fish-shaped piece liquid damper, or one end of the flow guide partition plate is reserved with a gap between the PS surface fish shell of the closed fish-shaped outer shell of the fish-shaped piece liquid damper, and the other end is connected to the SS surface fish shell of the closed fish-shaped outer shell of the fish-shaped piece liquid damper.

[0010] Preferably, the chord direction spacing between adjacent flow guide partition plates is in the range of 15-50 mm, that is, the size of the damping liquid flow channel in the fish-shaped piece liquid damper is in the range of 15-50 mm.

[0011] Preferably, the fish-shaped piece liquid damper has a closed fish-shaped outer shell made of glass fiber reinforced resin composite material.

[0012] Preferably, the flow guide partition plate is a glass fiber reinforced resin composite material partition plate.

[0013] Preferably, the size of the damping liquid flow channel in the fish-shaped piece liquid damper is in the range of 15-50 mm.

[0014] Preferably, the volume filling rate of the damping liquid in the fish-shaped piece liquid damper is in the range of 20%-30%, the viscosity of the damping liquid is in the range of 1-100 centipoise, and the liquid filling amount is in the range of 2-5 kg.

[0015] Preferably, the length of the fish-shaped piece liquid damper from the fish head to the fish tail is in the range of 600-1000 mm.

[0016] Preferably, the fish head and the fish tail of the fish-shaped piece liquid damper correspond to the leading edge and the trailing edge positions of the blade, respectively.

[0017] The application also provides a preparation method of the wind power blade provided with the liquid damper.

[0018] Preparation of the fish-shaped piece liquid damper and injection of the damping liquid;

[0019] Preparation of the SS half shell, the PS half shell and the blade web of the blade;

[0020] Put the blade web and fish-shaped piece liquid damper in the SS half shell, and use structural adhesive to fix and connect between each component, and coat structural adhesive on the bonding surface of the fish-shaped piece liquid damper to be bonded with the blade PS skin;

[0021] Turn over the PS half shell to the SS half shell to mold, and the outer shell of the fish-shaped piece liquid damper is bonded with the blade skin through structural adhesive;

[0022] Cure the structural adhesive, complete the bonding of the two half shells, and obtain the wind power blade with the liquid damper.

[0023] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0024] 1. The wind power blade with the fish-shaped piece liquid damper can effectively reduce vibration, improve the fatigue life of the blade, prevent resonance from occurring, and avoid blade breakage accidents.

[0025] 2. Compared with the blade with an eddy current tuned mass damper, the liquid damper has the advantages of lifelong maintenance-free and low cost, and can be installed near the blade tip, so that the damping efficiency of the blade can be greatly improved.

[0026] 3. The fish-shaped piece liquid damper is different from the U-shaped tuned liquid damper, and the greatest advantage is that it is not affected by different phase attitudes of the blade rotating in the air.

[0027] 4. The blade with the fish-shaped piece liquid damper can effectively suppress the vibration in the pitch direction of the blade in the running, stopping and idling states of the blade. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural diagram of a single fish-shaped piece liquid damper arranged at the blade tip.

[0029] Figure 2 is a configuration mode diagram of 15 fish-shaped piece liquid dampers arranged in an axial series array.

[0030] Figure 3 is one of the structural forms of the fish-shaped piece liquid damper (referred to as form A).

[0031] Figure 4 is the second structural form of the fish-shaped piece liquid damper (referred to as form B).

[0032] Figure 5 is the third structural form of the fish-shaped piece liquid damper (referred to as form C). DETAILED DESCRIPTION

[0033] The application will be described in further detail below with reference to the embodiments and drawings, but the embodiments of the application are not limited thereto.

[0034] As shown in Figure 1 and Figure 2 The present embodiment discloses a wind turbine blade configured with liquid dampers, in a section 10-20m away from the blade tip, N fish-shaped plate liquid dampers 1 are arranged in series along the axial direction of the blade cavity, N is 10-20, and the fish-shaped plate liquid dampers 1 are laminated in pairs along the spanwise array of the blade, the size and shape of each fish-shaped plate liquid damper 1 are consistent with the cavity space in the section, so as to be inlaid in the cavity of the blade, and the N fish-shaped plate liquid dampers 1 equivalently replace the original blade web in the section; the fish-shaped plate liquid dampers 1 and the blade skin 5 and the fish-shaped plate liquid dampers 1 in pairs are bonded together by structural adhesive; the fish-shaped plate liquid damper 1 is a fish-shaped cross-section plate-shaped prefabricated part with a thickness of 50-150mm, and the outer contour is the inner cavity clearance size of the blade airfoil cross-section, in order to exert the damping effect, the fish-shaped plate liquid damper 1 needs to provide the maximum flow to increase the damping effect, so the fish-shaped plate liquid damper 1 is provided with a flow guide partition plate 11 perpendicular to the chord line of the blade, the flow guide partition plate 11 divides the cavity of the fish-shaped plate liquid damper 1 into a tortuous and winding elongated damping liquid flow channel, so as to prolong the flow length of the damping liquid from the leading edge to the trailing edge of the blade, and the size of the flow channel is in the range of 15-50mm.

[0035] The fish-shaped plate liquid damper 1 is to eliminate the influence of the huge centrifugal force at the blade tip position on the damping effect, therefore, the size of the damper along the spanwise length direction of the blade, referred to as the fish slice thickness, cannot be too large, and is in the range of 50mm-150mm.

[0036] In order to realize standardized design, the length of the fish-shaped plate liquid damper 1 from the fish head to the fish tail is determined to be in the range of 600-1000mm to form a specification series, for example, 600mm, 700mm, 800mm, etc.

[0037] In addition, the fish-shaped plate liquid damper 1 can also be filled with turbulence or damping materials such as mesh plates or porous materials according to requirements.

[0038] In each fish type piece liquid damper 1, the volume filling rate of the damping liquid is in the range of 20%-30%, and the damping liquid viscosity is in the range of 1-100 centipoise. The liquid filling amount of the damper made thereby is at the level of 2-5 kg. If the blade needs a total amount of 50 kg of damping liquid, the standard damper needs to be arranged in series along the blade span direction for 10-20 fish type piece liquid dampers 1. First, the liquid damper structure is comprehensively decided according to the specific spatial position of the blade tip segment installation. At the blade tip segment, there is a balance of installation position selection. On the one hand, the damper requires as high a movement stroke as possible, so the damper is installed far away from the blade tip position to have a larger chord length space. On the other hand, the closer the damper is to the blade tip position, the smaller the modal mass of the blade, and the stronger the damping capacity. Therefore, through experimental verification, the damper of the present application is located in the segment of 10-20 m away from the blade tip, which is more reasonable.

[0039] The fish head and the fish tail of the fish type piece liquid damper 1 correspond to the leading edge 3 and the trailing edge 2 positions of the blade respectively. The blade web plate 4 is an important shear bearing structure of the blade "I" shaped girder, which is located at about 1 / 3 of the blade chord line, and is connected with the PS beam cap and the SS beam cap of the blade, and is perpendicular to the PS and SS airfoil curved surface of the blade. In order to arrange the fish type piece liquid damper 1, the blade web plate 4 needs to be disconnected. Therefore, the closed fish type outer shell 6 and the flow guide partition plate 11 of the fish type piece liquid damper 1 must be able to replace the function of the blade web plate 4, so the closed fish type outer shell 6 and the flow guide partition plate 11 of the fish type piece liquid damper 1 are glass fiber reinforced resin composite materials, which not only play the role of container but also play the role of web plate. The outer shell contour of the fish type piece liquid damper 1 has a curved contour that is matched with the airfoil contour of the blade, which is equivalent to being inlaid in the inner cavity of the blade, and the specific contour size only needs to be reduced by the thickness of the blade skin 5. The fish type piece liquid damper 1 and the blade skin 5 are bonded together by structural adhesive to form a whole.

[0040] Generally, the damping of the blade needs a certain amount of liquid, such as 50 kg of damping liquid. The damper installed near the blade tip has limited volume space, so the damper must have limited volume. A single liquid damper can usually only be configured with about 3 kg of damping liquid, which means that multiple liquid dampers need to be configured, such as 15 liquid dampers. In order to improve the space efficiency of the configuration, the liquid damper is made into a fish type piece structure, that is, the damper has two parallel outer shell planes, and the thickness is in the range of 50-150 mm, which is a small amount relative to the fish type contour length of about 800 mm, so it is described as a fish type piece structure. When the damper is installed, the fish type contour projection plane is perpendicular to the span direction of the blade, and the fish piece thickness is along the blade span direction. Figure 2The effect diagram of the 15 fish-shaped piece liquid dampers 1 integrated along the blade spanwise in series makes the total damping liquid mass reach 50 kg. The piece planes of adjacent dampers are sequentially contacted and bonded together by structural glue.

[0041] The integration of the 15 fish-shaped piece liquid dampers 1 means that the blade web 4 needs to be cut off by a corresponding length value, and the missing web is completely replaced by the damper integration equivalent.

[0042] The technical scheme of the single small liquid damper integration needs to be standardized and serialized, and as few specifications as possible are used to cover all capacity blades. The fish-shaped piece liquid damper 1 with a length of 600, 700, and 800 mm from the fish head to the fish tail is recommended.

[0043] In summary, the structure of the damper and the structure of the blade are essentially integrated, which has high structural efficiency.

[0044] The above-mentioned figure case only illustrates the scheme of the configuration and fusion design between the damper and the blade in space geometry. As a technical scheme for damping the blade vibration, the second design link is the internal structure scheme of how the fish-shaped piece liquid damper 1 plays a damping role.

[0045] Figure 3 If the fish-shaped piece liquid damper is completely hollow inside, when the blade swings along the chord direction, the damping liquid reciprocates between the fish head and the fish tail, and the damping dissipation of the vibration kinetic energy is limited, and the damping effect is poor. Therefore, a flow channel with a specific flux is arranged in the damper to increase the flow length of the damping liquid. The flow channel is completed by a group of flow guide separation plates 11 arranged in the chord direction of the fish-shaped piece liquid damper 1. The flow guide separation plates 11 are made of glass fiber reinforced plastic composite material, which replaces the blade web 4, and the chordwise spacing of the flow guide separation plates 11 is in the range of 15-50 mm. One end of the flow guide separation plate 11 is connected with the PS fish shell 9 of the closed fish-shaped shell 6 of the fish-shaped piece liquid damper 1, and the other end is reserved with a gap, for example, 15 mm, between the SS fish shell 10 of the closed fish-shaped shell 6 of the fish-shaped piece liquid damper 1. In this way, the damping liquid can flow from one end to the other end in the fish-shaped piece liquid damper 1 in a circuitous manner, for example, the arrow direction shown in the figure. Of course, there is another form, for example, one end of the flow guide separation plate 11 is reserved with a gap between the PS fish shell 9 of the closed fish-shaped shell 6 of the fish-shaped piece liquid damper 1, and the other end is connected with the SS fish shell 10 of the closed fish-shaped shell 6 of the fish-shaped piece liquid damper 1.

[0046] The damper of the present application is arranged in the oscillation direction of the blade, and dampens the vibration of the blade in the oscillation direction, mainly dampening the first order oscillation of the blade. The first order oscillation frequency of a large blade is usually about 0.5 Hz. When the blade oscillates, the mass inertia of the damping liquid has a tendency to keep the damping liquid in place, but the flow guide partition plate 11 that moves integrally with the blade will inevitably push the liquid mass to displace and do work. When the liquid mass displaces and flows, the transverse flow guide partition plate 11 will hinder the flow of the liquid, and through the action of liquid turbulence, surface tension, etc., the kinetic energy of the liquid brought by the blade vibration will be dissipated, thereby achieving the blade vibration damping effect.

[0047] Figure 4 The fish-shaped sheet liquid damper of the example, compared with the damper of Figure 3 , only has an internal flow channel mesh plate 12 added in the flow, and the damping liquid flowing through the flow channel mesh plate 12 will generate greater damping force. The other structural characteristics are similar and will not be repeated.

[0048] Figure 5 The fish-shaped sheet liquid damper of the example, compared with the damper of Figure 3 , only has an internal flow channel mesh plate 12 added in the flow, and the damping liquid flowing through the flow channel mesh plate 12 will generate greater damping force. The other structural characteristics are similar and will not be repeated.

[0049] Figure 3 , 4 , 5, the fish-shaped outer contour line 7 of the damper is obtained from the blade internal cavity contour of the blade airfoil curve. The PS fish shell 9 is obtained from the blade airfoil PS skin inner wall surface, and the SS fish shell 10 is obtained from the blade airfoil SS skin inner wall surface.

[0050] Figure 3 , 4 , 5, are fish-shaped sheet liquid dampers, and the damper has two parallel sheet planes 8. The practical fish sheet thickness range is 50-150 mm.

[0051] Figure 3 , 4 , 5, enumerates three damper structural embodiments. Any one or a combination of the fish-shaped sheet liquid damper structures A, B, and C can be configured in a blade.

[0052] The following is a preparation method of the wind power blade of the above-mentioned configuration liquid damper of the present embodiment, comprising the following steps:

[0053] Preparation of the fish-shaped sheet liquid damper 1 and injection of the damping liquid;

[0054] Preparation of the SS half shell, PS half shell, and blade web of the blade;

[0055] The fish fin liquid damper 1 is placed in the SS half shell, and the components are fixed by structural adhesive bonding, and the bonding surface of the fish fin liquid damper 1 to be bonded with the blade PS skin is coated with structural adhesive;

[0056] The PS half shell is flipped to the SS half shell to form a mold, and the outer shell of the fish fin liquid damper 1 is bonded to the blade skin 5 by structural adhesive bonding;

[0057] The structural adhesive is cured, the bonding of the two half shells is completed, and the wind power blade with the liquid damper is obtained.

[0058] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A wind turbine blade equipped with a liquid damper, characterized in that: In a section 10-20m away from the blade tip, N fish-shaped sheet liquid dampers (1) are arranged in series along the inner cavity of the blade axial direction, N being 10-20, and the two fish-shaped sheet liquid dampers (1) are stacked in a sheet-like manner, and arranged along the span direction of the blade. The shape and size of each fish-shaped sheet liquid damper (1) are consistent with the inner cavity space of the section, so as to be adapted and embedded in the inner cavity of the blade. The N fish-shaped sheet liquid dampers (1) are equivalent to replacing the original blade web in the section; the fish-shaped sheet liquid damper (1) and the blade skin (5) and the two fish-shaped sheet liquid dampers (1) are bonded together with structural adhesive; the fish-shaped sheet liquid damper (1) is a sheet prefabricated part with a fish-shaped cross section, with a thickness of 50-150mm, and its outer contour is the inner cavity clearance size of the blade airfoil cross section, and the inside of the fish-shaped sheet liquid damper (1) is provided with a guide partition perpendicular to the blade chord line. The partition plate (11) divides the inner cavity of the fish-shaped sheet liquid damper (1) into a tortuous and elongated damping liquid flow channel to extend the flow length of the damping liquid from the leading edge to the trailing edge of the blade; the guide partition plates (11) are arranged in a staggered manner along the chord direction of the fish-shaped sheet liquid damper (1); one end of the guide partition plate (11) is connected to the P of the closed fish-shaped shell (6) of the fish-shaped sheet liquid damper (1). The S-surface fish shell (9) is connected, and a gap is reserved between the other end and the SS-surface fish shell (10) of the closed fish-shaped shell (6) of the fish-shaped sheet liquid damper (1), or a gap is reserved between one end of the guide partition plate (11) and the PS-surface fish shell (9) of the closed fish-shaped shell (6) of the fish-shaped sheet liquid damper (1), and the other end is connected to the SS-surface fish shell (10) of the closed fish-shaped shell (6) of the fish-shaped sheet liquid damper (1).

2. The wind turbine blade equipped with a liquid damper according to claim 1, characterized in that: The damping liquid flow channel of the fish-shaped sheet-type liquid damper (1) has a disturbing fluid or a porous material damping filling body.

3. The wind turbine blade equipped with a liquid damper according to claim 1, characterized in that: The fish-shaped sheet liquid damper (1) has at least one of three structures or a combination of two or more structures: no filler in the flow channel, a mesh plate disturbing body in the flow channel, and a porous material damping filler in the flow channel.

4. The wind turbine blade equipped with a liquid damper according to claim 1, characterized in that: The chordal spacing between adjacent guide partition plates (11) is in the range of 15-50 mm, that is, the size of the damping liquid flow channel in the fish-shaped sheet liquid damper (1) is in the range of 15-50 mm.

5. The wind turbine blade equipped with a liquid damper according to claim 1, characterized in that: The fish-shaped sheet-type liquid damper (1) has a closed fish-shaped housing (6) made of a glass fiber reinforced resin composite material, and the flow guide partition plate (11) is a glass fiber reinforced resin composite material partition plate.

6. The wind turbine blade equipped with a liquid damper according to claim 1, characterized in that: The volume filling rate of the damping liquid in the fish-shaped sheet liquid damper (1) is in the range of 20%-30%, the viscosity of the damping liquid is in the range of 1-100 centipoise, and the liquid filling amount is in the range of 2-5 kg.

7. The wind turbine blade equipped with a liquid damper according to claim 1, characterized in that: The length of the fish-shaped sheet liquid damper (1) from the fish head to the fish tail is in the range of 600-1000 mm.

8. The wind turbine blade equipped with a liquid damper according to claim 1, characterized in that: The fish head and fish tail of the fish-shaped sheet liquid damper (1) correspond to the leading edge (3) and trailing edge (2) positions of the blade, respectively.

9. The method for preparing a wind turbine blade according to any one of claims 1 to 8, characterized in that: The following steps are involved: Prefabricate a fish-shaped sheet-type liquid damper (1) and inject damping liquid into it; Prefabricated blade SS half shells, PS half shells and blade webs; The blade web and the fish-shaped liquid damper (1) are placed in the SS half shell, and the components are fixed with structural adhesive, and the structural adhesive is applied to the joint surface of the fish-shaped liquid damper (1) to be bonded with the PS surface skin of the blade; The PS half shell is turned over to the SS half shell for closing the mold, and the outer shell of the fish-shaped sheet liquid damper (1) and the blade skin (5) are bonded together by means of structural adhesive; The structural adhesive is cured and the bonding of the two half shells is completed to obtain a wind turbine blade equipped with a liquid damper.

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