A family of airfoils suitable for 5-10 MW wind turbine blades

Abstract

The invention provides an airfoil family suitable for 5-10 mw wind turbine blades. The airfoil family comprises eight airfoils. The relative thicknesses of the eight airfoils are 18% C, 21% C, 25% C, 30% C, 35% C, 40% C, 50% C and 60% C in sequence, the maximum thickness positions of the eight airfoils are each 32% C, the trailing edge thicknesses of the eight airfoils are 0.46% C, 0.68% C, 0.90% C, 3.8% C, 6.1% C, 8.7% C, 12% C and 15% C, and C is the chord length. The airfoil family suitable for the 5-10 mw wind turbine blades has the advantages of being high in lift-drag ratio and low in roughness sensitivity under the conditions of high Reynolds numbers and design lift coefficients, and the design requirement of the large-scale wind turbine blades can be met.

Description

technical field [0001] The invention belongs to the technical field of blade airfoil design, and in particular relates to a family of airfoils suitable for 5-10 megawatt wind turbine blades. Background technique [0002] Wind turbine blade design is a core technology of wind turbine design. The airfoil that constitutes the blade is the basis of blade design. The research and application of this technology can be used to design high-performance wind turbines with greater wind energy capture capacity and low system load. Leaves lay the foundation. The single power of modern wind turbines continues to increase, the length of the blades increases accordingly, and the linear velocity of the main output area section (airfoil) of the blades increases, requiring the special airfoils for wind turbines to have a higher operating Reynolds number. The operating Reynolds number of the wing type can reach more than 9 million Reynolds number. At the same time, the increase of the length ...

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Problems solved by technology

However, the design object of this invention is a megawatt-level wind turbine, and its design Reynolds number is relatively low for multi-megawatt (5MW-10MW) wind turbines, and is not suitable for multi-megawatt large-scale wind turbine blades; patent [CN200910191275 .7] "Special airfoil design method for wind power machine and special airfoil for wind power machine" discloses a special airfoil design method for wind power machine and the special airfoil for wind power machine designed by this method. The special airfoil for wind power machine invented is in 1×10 6 ~3×10 6 It has good performance in the range of Reynolds number, but the wind turbine airfoil of this invention only has good aerodynamic performance at low Reynolds number, and is not suitable for multi-megawatt (5MW-10MW) large wind turbine blades; patent [CN201410534926 .9] "Wind Power Airfoil Positive Design Method and Wind Power Airfoil Family" discloses a wind power airfoil positive design method and a wind power airfoil, but it only considers the aerodynamic characteristics of the airfoil at low Reynolds number , is not suitable for multi-megawatt (5MW-10MW) large-scale wind turbine blades, and the designed airfoil family only includes three small-thickness wind turbine outer airfoils with relative thicknesses of 15%, 18% and 21%. Multi-megawatt (5MW-10MW) large-scale wind turbine blades need to select a series of wind turbine airfoils with different thicknesses for design; patent [CN201510183743.1] "A wind turbine airfoil design method using Bessel function curve "disclosed a wind turbine airfoil design method using the Bessel function curve, but only carried out research on the lift-to-drag ratio characteristics of the wind turbine airfoil designed by this method under the condition of medium and low Reynolds numbers, and did not consider The performance of wind turbine airfoils under high Reynolds number conditions is not suitable for multi-megawatt (5MW-10MW) large-scale wind turbine blades; patent [CN201410850976.8] "A multidisciplinary optimization design method for wind turbine airfoils" A multi-disciplinary optimization design method for wind turbine airfoils is disclosed, which optimizes the aerodynamic performance, structural properties and acoustic characteristics of the airfoil at the same time, but the invention is not aimed at multi-megawatt (5MW-10MW) wind turbines Blade design invented a family of wind turbine airfoils; the patent [CN201510047830.4] "A method for aerodynamic optimization design of vertical axis wind turbine airfoils" involves an aerodynamic optimization design method for vertical axis wind turbine airfoils, but it does not It is suitable for the design and research of horizontal axis wind turbine airfoil, not to mention the design and research of multi-megawatt wind turbine airfoil; patent [CN201310234549.2] "a family of large thickness blunt trailing edge wind turbine airfoil and its design method" Disclosed is a family of large-thickness blunt trailing edge wind turbine airfoils and its design method, specifically including four wind turbine airfoils with relative thicknesses of 45%, 50%, 55% and 60%, and all have a certain trailing edge thickness , the design Reynolds numbers of the four airfoils are medium and low Reynolds numbers, which are 4.0×10 6 , 3.5×10 6 , 3.0×10 6 and 2.5×10 6 , considering the operating conditions of multi-megawatt (5MW-10MW) wind turbines, the airfoil design Reynolds number of the invention is too low, which is not suitable for multi-megawatt large wind turbine blades; patent [CN201020677153.7]" A family of airfoils for wind turbine blades discloses a family of blunt trailing edge thick airfoils related to wind turbine blades. The thick airfoil is used at the root of the blade to replace the traditional cylindrical structure, thereby improving the performance of the blade, but the invention The airfoil design target is at 1.0×10 6 ~3.0×10 6 In the range of low and medium Reynolds numbers, the airfoil has good aerodynamic performance and structural characteristics, and it is also not suitable for multi-megawatt large wind turbine blades

[0006] It can be seen that all kinds of wind turbine airfoils disclosed in the prior art are not suitable for multi-megawatt large-scale wind turbine blades, and it is necessary to develop an airfoil family suitable for multi-megawatt large-scale wind turbine blades. Issues that urgently need to be resolved

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