A medium thickness airfoil blade of a large fan
An airfoil blade and fan technology, which is applied to wind turbines, engines, wind power generation, etc., can solve the problems of low utilization rate of wind energy and heavy structure weight, and achieve the effect of reducing fatigue load, reducing structure weight and improving wind energy utilization efficiency.
Active Publication Date: 2016-04-13
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 medium-thickness airfoil blade for a large fan, which can reduce its weight and improve the comprehensive 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 (named UP30) with a relative thickness of 30%. The medium-thickness airfoil blade of a large fan provided by the present invention, the outer profile of the middle cross section is mainly composed of leading edge 1, trailing edge 2, suction Surface profile line 3 and pressure surface profile line 4, in which leading edge 1 is a circular arc, leading edge 1 is respectively connected with suction surface profile line 3 and pressure surface profile line 4, the curvature at the connection point is continuous, and suction surface profile line 3 The end 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 conne...
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The invention relates to a moderate-thickness airfoil blade of a large-scale fan. An outer profile of the cross section of the middle part of the airfoil blade is divided into a leading edge, a trailing edge, a suction surface mold line and a pressure surface mold line, wherein a distance between the leading edge and the trailing edge is the chord length; the maximum thickness of the cross section is 25-35% of the chord length; a distance between a part at the maximum thickness and the leading edge is 25-35% of the chord length; the maximum camber of the cross section is 2.0-3.0% of the chord length; a distance between a part at the maximum camber and the leading edge is 75-85% of the chord length; the radius of the leading edge is 5.5-7.5% of the chord length; and the thickness of the end surface of the trailing edge is 0-3% of the chord length. The comprehensive performances of an airfoil are superior to the comprehensive performances of the traditional DU and NACA airfoils with the same relative thickness; the wind-power utilization efficiency is improved; the structural weight is reduced; the fatigue load is reduced; and the airfoil blade becomes an import technological base of developing a large-scale, efficient and low-cost wind turbine.
Description
technical field [0001] The invention relates to the field of wind power generation, in particular to a medium-thick 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 wil...
Claims
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IPC IPC(8): F03D80/00
CPCY02E10/72
Inventor 周文明代海涛
Owner GUODIAN UNITED POWER TECH