Wind turbine blade airfoil family

Abstract

The invention relates to a wind turbine blade airfoil family which comprises a first airfoil, a second airfoil, a third airfoil and a fourth airfoil which have different relative thicknesses, wherein the relative thickness is a ratio of the maximum thickness between the upper surface and the lower surface of each airfoil to the length of a chord line; each airfoil respectively comprises a front edge, a tail edge, a suction face and a pressure face; the radius of the front edge is smaller, the tail edge has the thickness of 0.25 to 0.63 percent of the chord length from the front edge to the tail edge, the suction face has smaller thickness, and the pressure face is four S-shaped post-loads; the relative thickness between the upper surface and the lower surface of the blade airfoil family is 15-25 percent; and the position of the maximum thickness of the blade airfoil family is located at a 34 to 32.3 percent point away from the front edge, wherein the profiles of the first airfoil, thesecond airfoil, the third airfoil and the fourth airfoil are respectively formed by smooth connection of dimensionless two-dimensional coordinates of each airfoil, and the dimensionless two-dimensional coordinates of the airfoils are obtained in such a way that the abscissa and the ordinate of each point on the pressure surfaces and the suction surfaces of the first airfoil, the second airfoil, the third airfoil and the fourth airfoil are divided by the chord length of each airfoil.

Description

technical field [0001] The invention relates to a wind turbine blade, in particular to an airfoil structure family of the wind turbine blade. Background technique [0002] The process of wind power generation is the process of converting wind energy into mechanical energy through wind turbines, and further converting it into electrical energy. The blade is one of the core components of a wind turbine. The performance of the blade directly affects the efficiency of wind energy conversion. The blade is generally formed by stacking a family of airfoils with good geometric compatibility along the span direction through a certain modeling method. Therefore, the blade The aerodynamic performance and structural performance of the blade directly determine the performance of the blade, which is the key to blade design. [0003] Since the aerodynamic characteristics of aviation airfoils were fully studied in the first half of the 20th century, traditional wind turbine blades generall...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of wind turbine blade airfoil family, to overcome the NACA (National Aviation Advisory Committee) airfoil maximum lift coefficient that is widely used in wind turbine blade at present more sensitive to leading edge roughness, stall characteristic is not good , the maximum lift-to-drag ratio is low, and the working ability is not high, etc.

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