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A 25% thick main airfoil for megawatt wind turbine blades

A wind turbine blade, megawatt-level technology, applied in the field of 25% thickness main airfoil, can solve the problem of large absolute value of moment coefficient and high sensitivity factor, achieve good high Reynolds number characteristics, improve utilization coefficient, and large lift-to-drag ratio Effect

Active Publication Date: 2016-11-23
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • A 25% thick main airfoil for megawatt wind turbine blades
  • A 25% thick main airfoil for megawatt wind turbine blades
  • A 25% thick main airfoil for megawatt wind turbine blades

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Embodiment Construction

[0040] This embodiment is a main airfoil with a thickness of 25% for megawatt-class wind turbine blades.

[0041] refer to figure 1 , present embodiment is that the NPU-WA-252 airfoil of wind turbine proposed for the design of large wind turbine blade is the design target, and the main design indicators of large wind turbine blade are as follows:

[0042] The design lift coefficient is 1.2;

[0043] The design angle of attack is 6 degrees;

[0044] The design Reynolds number is 6.0×10 6 , under high Reynolds number and high lift design conditions, the NPU-WA-252 airfoil is required to have a higher lift-to-drag ratio than other similar airfoils, and to maintain a similar lift-to-drag ratio to the NPU-WA-250 airfoil; in Reynolds Number below 1.5×10 6 In non-design conditions, the lift-to-drag ratio is kept comparable to that of traditional airfoils;

[0045] The NPU-WA-252 airfoil is required to have a higher lift coefficient than the traditional airfoil;

[0046] The mom...

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Abstract

The invention discloses a 25%-thickness main airfoil for a megawatt wind turbine blade. A wing form with the relative thickness of 0.25 chord length, the chordwise position, corresponding to the maximum thickness, of 0.325 chord length, the trailing edge thickness of 0.09 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 force factor, the chord length of the blade can be reduced, and therefore the weight of the blade is reduced. 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 the technical field of wind turbines, in particular to a main airfoil with a thickness of 25% for megawatt wind turbine blades. Background technique [0002] Wind turbine blades are the core technology of wind turbine design, and the airfoils that make up the blades are the basis of blade design. The research and application of this technology can design high-performance blades with greater wind energy capture capacity and low system load. For large The design of large-diameter wind turbines is of great significance; and large-diameter wind turbines are the main technology for building megawatt-level 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 performance and uneven The stall characteristics cannot meet the design...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03D80/00
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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