Method for designing wind turbine airfoil by using Bessel function curve

Abstract

The invention discloses a method for designing a wind turbine airfoil by using a Bessel function curve. According to the method, the third-order Bessel function is adopted and can represent a section of curve through four control points only, and in addition, the starting point and the end point are fixed, so that only two control points are required to be changed for a section of the curve; each of an upper wing surface and a lower wing surface of the airfoil is represented by a section of curve, the starting points and the end points of the upper wing surface and the lower wing surface respectively coincide, and then the staring points and the end points are in smooth connection. According to the invention, the airfoil profile can be controlled more conveniently and effectively by using several points in space, so that optimization design time of the airfoil is shortened, and airfoil design efficiency is improved; the designed airfoil has an extremely high lift coefficient, so that chord length of a blade is reduced, and the material required by the blade is reduced; a higher lift-drag ratio is realized, so that the wind-power utilization coefficient is increased; the method can be popularized to design of wind turbine airfoils of different thicknesses, plane airfoils, turbine blade profiles and other complex curves and has a high social value and a good economic benefit.

Description

technical field [0001] The invention belongs to the technical field of wind turbine blade design, and provides a wind turbine airfoil design method, in particular to a wind turbine airfoil design method using a Bessel function curve. Background technique [0002] Airfoil design is the first step in the design of wind turbine blades, and the design of airfoil profile is particularly important for the design of the aerodynamic shape of wind turbine blades. In the process of wind turbine airfoil profile design, it is necessary to consider improving the aerodynamic performance of the airfoil to increase the utilization rate of the wind rotor and reduce the cost of power generation. [0003] The development of wind turbine airfoils is based on low-speed airfoil applications, such as glider airfoils, FX-77 airfoils, and NASA LS airfoils. In order to meet the working requirements of wind turbines, foreign countries began to develop special airfoils for wind turbines in the 1980s. ...

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Problems solved by technology

[0004] However, due to the large number of control points of the airfoil profile and the increase of parameter variables, this method brings greater difficulty to the design and optimization of the airfoil, and the optimization calculation time also increases, which is not conducive to the parametric optimization and design of the airfoil.

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