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An aerodynamic optimization method for wind turbine airfoil profile considering a high turbulence free flow effect\

An optimization method and airfoil technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as the unpredictability of the ultimate load of the blade, the increase of fatigue load, and the low aerodynamic efficiency of the blade

Active Publication Date: 2019-01-11
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

More importantly, free-flow turbulence is unsteady and uncertain in time and space, and the airfoil designed with extremely low free-flow turbulence disturbance will not only cause the Low aerodynamic efficiency and increased fatigue load will make the ultimate load of the blade unpredictable

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  • An aerodynamic optimization method for wind turbine airfoil profile considering a high turbulence free flow effect\
  • An aerodynamic optimization method for wind turbine airfoil profile considering a high turbulence free flow effect\
  • An aerodynamic optimization method for wind turbine airfoil profile considering a high turbulence free flow effect\

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[0063] The technical solutions and advantages of the present invention will be described in detail below in conjunction with examples and accompanying drawings.

[0064] The flow outside the blade is complex and is the main area for wind energy capture, so the optimization of the outer airfoil is selected as an example of the present invention, and the relative thickness of the target airfoil is set to 21%. The current mainstream models of wind farms in my country are 2MW / 3MW models, so a 2MW blade with a length of 43m is selected as the reference blade. Based on the momentum blade element theory, the operating angle of attack range (3°~7°) and the operating Reynolds number range (3.0E +06~6.0E+06); thus, the design Reynolds number of the airfoil is set to Re=4.5E+06, and the design angle of attack is 5°. Low turbulence intensity inflow conditions (<0.1%) are usually used in airfoil design and test tests. However, when operating at rated wind speeds and above, the free flow t...

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Abstract

The invention discloses an aerodynamic optimization method of a wind turbine airfoil profile considering a high turbulence free flow effect. Based on the high turbulence characteristics of incoming flow from a blade airfoil in an actual wind field, the effect of inflow turbulence intensity on the airfoil profile aerodynamic efficiency and load are parameterized and the sensitivity parameters of the maximum lift-drag ratio and the maximum lift coefficient are established, and then the aerodynamic optimization model of the airfoil is formed by combining the objective parameters of airfoil efficiency and load, surface roughness sensitivity and Reynolds number effect with the weight coefficient method, and the aerodynamic optimization method of the airfoil is constructed by combining the genetic algorithm. As shown by the numerical simulation and evaluation, the aerofoil profile aerodynamic optimization method provided by the invention not only maintains a high design lift coefficient andimprove the maximum lift-drag ratio, but also remarkably reduces the sensitive parameters of the aerofoil aerodynamic performance varying with the turbulence intensity of the free flow; in addition, the maximum lift coefficient of the airfoil is effectively limited, and the stall process is more smooth.

Description

technical field [0001] The invention belongs to the field of wind turbine airfoil design, and relates to an aerodynamic optimization method for a wind turbine airfoil, in particular to an optimal design method for a wind turbine airfoil with low aerodynamic performance sensitivity in a high-turbulence free flow wind field. Background technique [0002] The airfoil is the spanwise design element of a wind turbine blade. The aerodynamic performance of the airfoil fundamentally determines the wind energy conversion efficiency and load characteristics of the wind turbine blade. Therefore, studying the development law of the boundary layer under various inflow conditions from the perspective of two-dimensional airfoils and developing wind turbine airfoils with excellent aerodynamic performance is the basic means to realize efficient, stable and safe operation of wind turbine blades in complex wind field environments . [0003] Since the 1980s, researchers have designed a variet...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20Y02E10/72
Inventor 李星星杨科张磊
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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