Large-thickness airfoil blade of a large fan
A technology of airfoil blades and large thickness, which is applied in the direction of wind power generators, engines, wind power generation, etc. It can solve the problems of low wind energy utilization rate and heavy structural weight, and achieve the goal of reducing fatigue load, reducing structural weight, and improving wind energy utilization efficiency Effect
Active Publication Date: 2016-03-23
GUODIAN UNITED POWER TECH
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a large-thickness airfoil blade of a large-scale fan, which reduces its weight and improves the overall performance of the fan, thereby overcoming the existing problems of heavy structure and low utilization rate of wind energy
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[0018] refer to figure 1 , figure 2 , the present invention provides a blade airfoil with a relative thickness of 40% (named UP40). The profile line 3 and the pressure surface profile line 4 are composed of the front edge 1 is a circular arc, the front edge 1 is respectively connected with the suction surface profile line 3 and the pressure surface profile line 4, the curvature at the connection point is continuous, and the end of the suction surface profile line 3 11 is connected with the end 13 of the pressure surface profile line 4 to form the trailing edge 2.
[0019] first of all, yes figure 1 The names of the various parts are defined as follows:
[0020] 1. Middle arc 10: Make a series of inscribed circles of suction surface profile 3 and pressure surface profile 4 in the airfoil, and the line connecting the centers of these inscribed circles is called the center arc 10 of the airfoil.
[0021] 2. Chord length: the connecting line between the front and rear ends of...
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The invention relates to a large-thickness airfoil-shaped blade of a large-scale wind turbine. The outer contour of the cross section of a blade middle portion, near to a blade root, 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 38.0%-42.0% 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 2.5%-3.5% of the chord length, the distance between the maximum camber position and the leading edge is 75%-85% of the chord length, the radius of the leading edge is 12.0%-16.0% of the chord length, and the end-face thickness of the trailing edge is 2%-4% of the chord length. Compared with conventional airfoil shapes DU and NACA with same relative thicknesses, the airfoil shape has the advantages that the airfoil shape is good in comprehensive performance, wind energy utilization rate is improved, structural weight and fatigue load are 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 airfoil blade of a large fan. Background technique [0002] With the increasingly prominent energy and environmental issues, the abundant, pollution-free and renewable wind energy has gradually attracted people's attention. The core component of the wind turbine—the blade has airfoil sections with different thicknesses and twist angle distributions. The aerodynamic performance of the airfoil is closely related to the operating efficiency and reliability of the whole machine. Early wind turbine blade design preferred the aeronautical airfoil with relatively mature development and better lift-drag characteristics, but practice has proved that the design of this type of airfoil cannot well meet the design and use requirements of the wind turbine, such as for stall-type wind turbines. As far as the wind turbine is concerned, excessive peak energy and peak load ...
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IPC IPC(8): F03D80/00
CPCY02E10/72
Inventor 周文明代海涛刘丹
Owner GUODIAN UNITED POWER TECH