Large-thickness blunt-trailing-edge airfoil-shaped blade of large-scale wind turbine

Abstract

The invention relates to a large-thickness blunt-trailing-edge airfoil-shaped blade of a large-scale wind turbine. The outer contour of the cross section of a root portion of the blade is divided into a leading edge, a trailing edge, a suction-surface molded line and a pressure-surface molded line. The distance between the leading edge and the trailing edge is chord length, the maximum thickness of the cross section is 65.0%-75.0% of the chord length, and the distance between the thickest position and the leading edge is 25%-35% of the chord length. The maximum camber of the cross section is 0.1%-0.5% of the chord length, the distance between the maximum camber position and the leading edge is 85%-97% of the chord length, the radius of the leading edge is 35.0%-45.0% of the chord length, and the end-face thickness of the trailing edge is 25%-35% of the chord length. The airfoil shape is a precedent in domestic airfoil shapes, with relative thickness of over 40%, special for wind turbines; by the airfoil shape, static rigidity of the blade can be improved and structural weight can be reduced, and an important technical basis is provided to development of large-size efficient wind turbines with low costs.

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 various external loads, increases the risk...

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 deficiencies of low structural rigidity and heavy weight

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