After-load blunt trailing edge wing profile designed based on sharp trailing edge wing profile

Abstract

The invention provides an after-load blunt trailing edge wing profile designed based on a sharp trailing edge wing profile. In the invention, on the premise of keeping the shapes of a front edge (1) of a sharp trailing wing profile, a force absorption surface (2) and a front pressure surface (3) unchanged, a corresponding relation is established between the thickness of the blunt trailing edge and a maximum thickness of the sharp trailing wing profile; meanwhile, a bending curve (7) behind the maximum thickness is used as a variable, and the deformation of the bending curve is controlled by adopting a curved girder small-deflection theory of trailing edge concentrated loading; and then initial conditions such as curve continuous fairing, blunt trailing edge thickness, and the like are combined, and a bending distribution function of a new wing profile is solved with a mathematical method so as to obtain a new blunt trailing edge wing profile geometrical external form. The wing profile preserves the geometrical characteristics of an original wing profile as much as possible, improves the after-load characteristics of the wing profile trailing edge, and improves the pneumatic property of the wing profile. The method is based on theoretical analysis and the mathematical method and has the characteristics of reliable property, strong universality and easiness for realization.

Description

technical field [0001] The invention relates to a rear-loaded blunt trailing edge airfoil specially designed for wind turbine blades, in particular to a blunt trailing edge airfoil designed based on a sharp trailing edge airfoil, which belongs to the field of airfoil design and application. Background technique [0002] Airfoils are the basis of modern wind turbine design. The airfoil with good aerodynamic performance can greatly increase the output power of the wind turbine, improve the reliability of the whole machine, and reduce manufacturing and maintenance costs. At present, the airfoils used for wind turbine blades at home and abroad are mainly based on the design ideas of traditional aviation airfoils or improved on traditional aviation airfoils. However, there are obvious differences between the wind-powered airfoil and the traditional aviation airfoil. The most important thing is the blunt trailing edge of the wind-powered airfoil, which is different from the sharp...

AI Technical Summary

Problems solved by technology

First of all, the position of the thickening starting point of the airfoil pressure surface and the thickness of the blunt trailing edge vary with the thickness and type of the airfoil, especially the starting point of the thickening of the airfoil pressure surface, because its variation range includes most of the chord length positions, The range of values ​​given is not practical; secondly, the position of the thickening starting point of the pressure surface and the thickness of the blunt trailing edge are given based on experience, which cannot effectively control the camber distribution of the pressure surface, and the camber has a great influence on the performance of the airfoil. The uncertainty of its change will greatly reduce the excellent aerodynamic performance of the original airfoil; thirdly, for multiple cross-section airfoils of the same blade, if the starting point of the pressure surface thickening and the thickness of the blunt trailing edge are selected differently coordination, it will also destroy the streamline shape of the new airfoil, which will cause difficulties in the lofting process of the blade

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