Novel high-robustness high-lift-drag-ratio laminar flow airfoil profile of wind turbine

Abstract

The invention provides a novel high-robustness and high-lift-drag-ratio laminar flow airfoil of a wind turbine. The airfoil is composed of a front edge, a rear edge, an upper arc line and a lower arc line, wherein the upper arc line and the lower arc line are located between the front edge and the rear edge. The ratio of the radius r of the front edge of the airfoil to the chord length c of the airfoil is r / c = 0.942%, the ratio of the maximum thickness a to the chord length c of the airfoil is a / c = 20.25%, the position of the maximum thickness is located at the position where x / c = 30.62%, the ratio of the maximum camber b to the chord length c of the airfoil is b / c = 2.15%, the position of the maximum camber is located at the position where x / c = 70.8%, and the ratio of the thickness w of the rear edge to the chord length c of the airfoil is w / c = 0.26%; x is the distance from the leading edge to the trailing edge in the chord line direction of the airfoil, and the values of r / c, a / c, b / c, x / c and w / c can each have a maximum error of + / -3%. According to the design of the rough airfoil profile state, the performance of the smooth state is considered at the same time, and higher aerodynamic performance and robustness are achieved in the whole service cycle of the blade.

Description

technical field [0001] The invention relates to the field of airfoil design in the aerodynamic shape design of wind turbines, in particular to a laminar airfoil of wind turbines with high robustness and high lift-to-drag ratio, which can have superior aerodynamic characteristics in both smooth surface and rough environments. Background technique [0002] Among the clean energy currently developed and utilized by human beings, wind power generation is a way with less impact on the environment. Wind energy is not only pollution-free, it is a renewable resource, but also has a huge content. According to the estimates of the Chinese Academy of Meteorological Sciences, my country's total wind energy reserves ranks third in the world. If the wind energy can be fully and efficiently utilized, it will produce huge economic and environmental protection benefits. [0003] The blade is one of the core components of the wind turbine, and the aerodynamic performance of the blade direct...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of existing wind turbine airfoils, the present invention proposes a high-robust high lift-drag ratio wind turbine laminar flow airfoil suitable for complex operating environments considering the influence of roughness elements, based on Swedish FFA-W3-211 The airfoil is optimized and designed based on the reference airfoil, and finally a new type of laminar flow airfoil with a high lift-to-drag ratio on both smooth and rough surfaces is obtained

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