A large thickness blunt trailing edge airfoil blade of a large wind turbine

Abstract

The invention relates to a big-thickness blunt trailing edge airfoil-shaped blade for a large-scale blower. The outer contour of the cross section of the blade root part of the blade is divided into a front edge, a trailing edge, a suction surface molded line and a pressure surface molded line, wherein the distance from the front edge to the trailing edge is the chord length; the maximum thickness of the cross section is 50.0% to 55.0% of the chord length; the distance from the part with the maximum thickness to the front edge is 30% to 35% of the chord length; the maximum camber of the cross section is 0.5% to 1.5% of the chord length; the distance from the part with the maximum camber to the front edge is 85% to 95% of the chord length; the radius of the front edge is 25.0% to 35.0% of the chord length; the thickness of the end surface of the trailing edge is 10% to 14% of the chord length. The airfoil section creates a pioneer of special airfoil sections, with the relative thickness larger than 40%, of domestic wind turbines, and the application of the airfoil section not only enhances the static rigidity of the blade, but also reduces the structural weight, and lays an import technical foundation for the development of large-scale high-efficient and low-cost wind turbines.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a large thickness blunt trailing edge airfoil blade of a large fan. Background technique [0002] As energy and environmental problems become more and more prominent, people pay more and more attention to the abundant, pollution-free and renewable wind energy, and the development of wind power is particularly rapid. Regardless of whether it is for onshore or offshore wind turbines, the capacity of the unit is showing an increasing trend. Correspondingly, the length of the blade, which is a key component, has also increased from about 20 meters (1 MW unit) a few years ago to About 60 meters (5 MW units) and even the current maximum of about 75 meters (10 MW units). However, as the length of the blade increases, the flexibility increases, and the corresponding structural rigidity is greatly reduced, which weakens its ability to resist the influence of various external loads, a...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a large-thickness blunt trailing edge airfoil blade of a large-scale fan, so that its structural rigidity is high, the weight is reduced, and the comprehensive performance of the fan is improved, thereby overcoming the existing structure with heavy weight and low utilization rate of wind energy lack of

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