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A 21% thick main airfoil for megawatt wind turbine blades

A wind turbine blade, megawatt technology, applied in the field of wind turbines, can solve the problems of high sensitivity factor and large absolute value of moment coefficient, achieve high Reynolds number characteristics, reduce blade weight, and improve wind energy utilization coefficient. Effect

Active Publication Date: 2017-02-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shortcomings of this airfoil are: under the condition of low Reynolds number, the sensitivity factor of the maximum lift to roughness is high, which is twice as high as that of the DU series airfoil, and the absolute value of the moment coefficient is too large

Method used

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  • A 21% thick main airfoil for megawatt wind turbine blades
  • A 21% thick main airfoil for megawatt wind turbine blades
  • A 21% thick main airfoil for megawatt wind turbine blades

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Embodiment Construction

[0039] This embodiment is a main airfoil with a thickness of 21% for megawatt wind turbine blades.

[0040] refer to figure 1 , the present embodiment is the NPU-WA-211 wind turbine airfoil proposed at the large-scale wind turbine blade design, and its main design index is as follows:

[0041] The design lift coefficient is 1.2; the design angle of attack is 6 degrees;

[0042] The design Reynolds number is 6.0×10 6 , under the design conditions of high Reynolds number and high lift, the NPU-WA-211 airfoil is required to have a higher lift-to-drag ratio than other similar airfoils, and maintain a similar lift-to-drag ratio to the NPU-WA-210 airfoil. At Reynolds numbers below 1.5×10 6 In the off-design situation, the lift-to-drag ratio is kept comparable to that of the traditional airfoil.

[0043] The NPU-WA-211 airfoil is required to have a higher maximum lift coefficient than the traditional airfoil.

[0044] The moment coefficient of the airfoil is close to that of the...

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Abstract

The invention discloses a 21%-thickness main airfoil for a megawatt wind turbine blade. A wing form with the relative thickness of 0.21 chord length, the chordwise position, corresponding to the maximum thickness, of 0.325 chord length, the trailing edge thickness of 0.05 chord length, the design lift coefficient of 1.2 and the designed attack angle of 6 degrees is designed through a computational fluid mechanics method and an advanced airfoil parameterization method. The airfoil has a high lifting coefficient, and can shorten the chord length of the blade and reduce the weight of the blade. Under the design conditions of a high Reynolds number and high lift force, the airfoil has a higher lift-drag ratio compared with the other airfoils in the same class, and the utilization factor of wind energy is improved. Under the non-design condition that the Reynolds number is lower than 1.5*106, the airfoil has the lift-drag ratio equivalent to that of a traditional airfoil. The maximum lifting force factor of the airfoil is not sensitive to roughness. The airfoil is particularly suitable for megawatt speed change or a bending-moment adjustment large wind turbine.

Description

technical field [0001] The invention relates to a wind turbine blade airfoil, in particular to a 21% thick main airfoil used for a megawatt wind turbine blade. It belongs to the technical field of wind turbines. Background technique [0002] Wind turbine blades are one of the core technologies in the design of wind turbines. The airfoils that make up the blades are the basis of blade design. The research and application of this technology can lead to the design of high-performance blades with greater wind energy capture capabilities and low system loads. , which is of great significance to the design of large-diameter wind turbines. Large-diameter wind turbines are the main technology for building megawatt-class high-power wind turbines. [0003] In the 1990s, the design of wind turbine blades usually used existing traditional aviation airfoils, such as NACA44 series and NACA63 or 64 series airfoils, but due to their small relative thickness, low high-lift aerodynamic perf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03D1/06
CPCY02E10/72
Inventor 韩忠华许建华余雷刘方良宋文萍焦予秦
Owner NORTHWESTERN POLYTECHNICAL UNIV
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