NL2006654C2 - Rotor blade with an asymmetrical main element for carrying a flat wise bending moment. - Google Patents

Rotor blade with an asymmetrical main element for carrying a flat wise bending moment. Download PDF

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Publication number
NL2006654C2
NL2006654C2 NL2006654A NL2006654A NL2006654C2 NL 2006654 C2 NL2006654 C2 NL 2006654C2 NL 2006654 A NL2006654 A NL 2006654A NL 2006654 A NL2006654 A NL 2006654A NL 2006654 C2 NL2006654 C2 NL 2006654C2
Authority
NL
Netherlands
Prior art keywords
rotor blade
main element
girder
carrying
bending moment
Prior art date
Application number
NL2006654A
Other languages
Dutch (nl)
Inventor
Edo Johannes Hendrikus Kuipers
Original Assignee
E J H Kuipers B V
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by E J H Kuipers B V filed Critical E J H Kuipers B V
Priority to NL2006654A priority Critical patent/NL2006654C2/en
Application granted granted Critical
Publication of NL2006654C2 publication Critical patent/NL2006654C2/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06—Rotors
    • F03D3/062—Rotors characterised by their construction elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/74—Wind turbines with rotation axis perpendicular to the wind direction

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Description

ROTOR BLADE WITH AN ASYMMETRICAL MAIN ELEMENT FOR CARRYING A FLATWISE BENDING MOMENT
The present invention relates to a rotor blade for a wind turbine, which rotor 5 blade is provided with a main element for carrying a flat wise bending moment exerted on the rotor blade, which main element comprises at least one shear web and two girders attached on opposite sides of the shear web.
When in use rotor blades of a wind turbine are not only rotatably driven by the wind, but are also moved back and forth in wind direction. In order to prevent 10 bending of the blades it is common practice to provide a rotor blade with a main element as described in the preamble of claim 1. In practice known main elements comprise two identical girders that are separated by one or more shear webs. The girders are attached against the inner side of the rotor blade. The shear webs form bridges between the girders.
15 The rotor blade according to the present invention differs from the known rotor blade in that the first girder is made of a first type of material and the second girder is made of a second type of material, which first and second types of material differ in material stiffness.
Applicant has found that certain control strategies and applications cause an 2 0 asymmetrical load on both sides of the rotor blade and consequently an asymmetrical strain distribution on both sides of the rotor blade. By designing the two girders in the main element differently such that the material stiffness of the first girder is higher than the material stiffness of the second girder an effective solution is provided against asymmetrical loads on the rotor blade. This solution is more 2 5 economical than simply choosing a material with a high enough material stiffness for both girders, since a material with a high material stiffness generally is more expensive.
A rotor blade according to the preamble of claim 1 is known from US 2007/189903.
3 0 The present invention provides a rotor blade that is specifically suitable for down wind turbines and distinguishes over the state of the art in that the first girder lies on the suction side of the rotor blade and the first type of material comprises carbon fibre and in that the second girder lies on the pressure side of the rotor blade and the second type of material comprises glass fibre.
35 According to a first preferred embodiment of the rotor blade according to the 2 invention the modulus of elasticity of the first type of material is at least two times higher than the modulus of elasticity of the second type of material. Applicant has calculated that a factor two in modulus of elasticity suffices in practice.
5 The invention will be further described with reference to the attached drawings, wherein
Figure 1 shows a cross section through a first embodiment of a rotor blade according to the invention; and
Figure 2 shows a cross section through a second embodiment of a rotor 10 blade according to the invention.
Like component are designated in the figures by means of the same reference numerals.
15 Figure 1 shows a first preferred embodiment of a rotor blade according to the invention. A rotor blade 1 is shown in cross section. The left hand side is in use referred to as pressure side (PS), the right hand side in figure 1 is in use generally known as suction side (SS). Rotor blade 1 is provided with a main element 2 for carrying a flatwise bending moment exerted on the rotor blade 1 when in use. The 2 0 main element 2 comprises two girders 4, 5. Each girder lies against the inner side of the rotor blade 1. Each girder follows the contour of said inner side. Each girder extends over at least a part of the length of the rotor blade 1. The girders 4, 5 are separated by one or more shear webs 3. The shear webs 3 extend over the width of the rotor blade 1 and over at least a part of the length of the rotor blade 1. Girders 4 25 and 5 are commonly known as main girders.
According to the present invention main girders 4 and 5 are not identical.
More specifically main girders 4 and 5 are designed to withstand different levels of strain. First main girder 4 is made of a first type of material. Second main girder 5 is made of a second type of material. The first and second types of material differ in 3 0 material stiffness. Material stiffness is related to the modulus of elasticity or E-module also known as Young’s module. The flat wise bending stiffness is in the relevant art expressed as E times I in units of Nm2, herein E is the modulus of elasticity and I is the moment of inertia. Preferably the E-module of main girder 4 is higher than the E-module of main girder 5, more preferably at least two times higher.
35 In a practical embodiment the first main girder 4 comprises carbon fibre. One 3 example of a carbon fibre material with a high E-modulus is carbon fibre reinforced plastic (CFRP).
According to a practical embodiment the second main girder 5 comprises glass fibre. In the art rotor blades are usually manufactured of glass fibre, f.i. glass 5 fibre reinforced plastic (GFRP). GFRP is also suitable for manufacture of the second main girder 5 and of the shear webs 3.
In figure 1 the first main girder 4 lies on the suction side SS of the rotor blade 1 and the second main girder 5 lies on the pressure side PS of the rotor blade 1. The embodiment of figure 1 is specifically useful in down wind machines.
10 Figure 2 shows a cross section of a second embodiment of a rotor blade according to the invention. This second embodiment differs from the first embodiment in that the first main girder 4 now lies on the pressure side PS of the rotor blade 1, where as the second main girder 5 now lies on the suction side SS of the rotor blade 1. The second embodiment is specifically useful for up wind 15 machines.
Preferably the thickness of first main girder 4 and second main girder 5 is substantially equal. The width of the second main girder 5 is larger than the width of the first main girder 4.
Both the first and the second embodiment of the rotor blade 1 according to 2 0 the invention may comprise one or more sets of secondary girders 14, 15. Preferably secondary girders 14 and 15 are not identical either. Preferably the first secondary girder 14 is made of the first type of material of the first main girder 4. Preferably the second secondary girder 15 is made of the second type of material of the second main girder 5.
2 5 It is noted that the invention is not limited to the embodiment described and shown herein, but generally extends to any embodiment which falls within the scope of the appended claims as seen in the light of the foregoing description and drawings.
30

Claims (2)

1. Rotorblad voor een windturbine, welk rotorblad is voorzien van een 5 hoofdelement voor het dragen van klapbelasting op het rotorblad, welk hoofdelement ten minste één rug omvat en twee gordingen, die zich aan weerszijden van de rug bevinden, waarin de eerste gording is vervaardigd van een eerste materiaalsoort en waarin de tweede gording is vervaardigd van een tweede materiaalsoort, welke eerste en tweede materiaalsoort een 10 verschillende materiaalstijfheid hebben, met het kenmerk, dat de eerste gording zich aan de zuigzijde van het rotorblad bevindt en de eerste materiaalsoort koolstofvezel omvat en dat de tweede gording zich aan de drukzijde van het rotorblad bevindt en de tweede materiaalsoort glasvezel omvat. 15Claims 1. Rotor blade for a wind turbine, which rotor blade is provided with a main element for bearing impact load on the rotor blade, which main element comprises at least one back and two purlins which are located on either side of the back in which the first purlin is manufactured of a first material type and in which the second purlin is made of a second material type, which first and second material types have a different material stiffness, characterized in that the first purlin is on the suction side of the rotor blade and the first material type comprises carbon fiber and that the second purlin is on the pressure side of the rotor blade and the second material comprises glass fiber. 15 2. Rotorblad volgens conclusie 1, waarin de elasticiteitsmodulus van de eerste materiaalsoort tenminste een factor twee groter is dan de elasticiteitsmodulus van de tweede materiaalsoort. 20Rotor blade according to claim 1, wherein the elastic modulus of the first material type is at least a factor of two greater than the elastic modulus of the second material type. 20
NL2006654A 2011-04-22 2011-04-22 Rotor blade with an asymmetrical main element for carrying a flat wise bending moment. NL2006654C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL2006654A NL2006654C2 (en) 2011-04-22 2011-04-22 Rotor blade with an asymmetrical main element for carrying a flat wise bending moment.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2006654A NL2006654C2 (en) 2011-04-22 2011-04-22 Rotor blade with an asymmetrical main element for carrying a flat wise bending moment.
NL2006654 2011-04-22

Publications (1)

Publication Number Publication Date
NL2006654C2 true NL2006654C2 (en) 2012-10-23

Family

ID=44557183

Family Applications (1)

Application Number Title Priority Date Filing Date
NL2006654A NL2006654C2 (en) 2011-04-22 2011-04-22 Rotor blade with an asymmetrical main element for carrying a flat wise bending moment.

Country Status (1)

Country Link
NL (1) NL2006654C2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61190173A (en) * 1985-02-20 1986-08-23 Yamaha Motor Co Ltd Rotor blade construction for wind mill
DE102005059298A1 (en) * 2004-12-17 2006-06-22 General Electric Co. System and method for passive load reduction in a wind turbine
US20070189903A1 (en) * 2006-02-13 2007-08-16 General Electric Company Wind turbine rotor blade
GB2451192A (en) * 2008-07-18 2009-01-21 Vestas Wind Sys As Wind turbine blade reinforced with different types of carbon fibres

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61190173A (en) * 1985-02-20 1986-08-23 Yamaha Motor Co Ltd Rotor blade construction for wind mill
DE102005059298A1 (en) * 2004-12-17 2006-06-22 General Electric Co. System and method for passive load reduction in a wind turbine
US20070189903A1 (en) * 2006-02-13 2007-08-16 General Electric Company Wind turbine rotor blade
GB2451192A (en) * 2008-07-18 2009-01-21 Vestas Wind Sys As Wind turbine blade reinforced with different types of carbon fibres

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Effective date: 20200501