Optimization design method of blunt trailing edge airfoil under condition of surface roughness of wind turbine blade

Abstract

The present invention discloses an optimization design method of a blunt trailing edge airfoil under the condition of surface roughness of a wind turbine blade. The method comprises the following steps: forming parameterized control equations of a blunt trailing edge airfoil profile by adopting a generalized functional integrated expression and a B-spline curve of the wind airfoil; by using the method of shifting coordinates of the specified position of the leading edge of the airfoil, adding a boss to the specified position of the suction surface to simulate the surface roughness of the blade; taking a shape function coefficient of the airfoil, control parameters of the B-spline curve, the thickness of the blunt trailing edge and a distribution ratio of the blunt trailing edge on the upper side of the mean camber line as design variables, using particle swarm optimization coupled XFOIL software to optimize the rough blunt trailing edge airfoil profile, and proposing an optimization design method of the blunt trailing edge airfoil under the condition of the surface roughness of the blade; and for the rough S822R airfoil (R represents rough), optimizing to obtain the blunt trailingedge modification with thickness of 2.13% and thickness distribution ratio of 0:1, and using the CFD method to study the lift and drag coefficients and the ratio of lift to drag of the airfoil. According to the method disclosed by the present invention, the aerodynamic performance of the blunt trailing edge airfoil under the condition of the surface roughness of the wind turbine blade can be significantly improved, and the wind energy utilization efficiency of the wind turbine under the harsh working environment is better enhanced.

Description

technical field [0001] The invention belongs to the technical field of airfoil optimization design and modification, and in particular relates to an optimization design method of blunt trailing edge airfoil under the condition of rough surface of wind turbine blade by using computational fluid dynamics and optimization algorithm. Background technique [0002] Wind turbines mostly work in areas with harsh environments such as alpine, coastal, and frequent sandstorms, and the surfaces of their blades often adhere to dirt such as dust, insects, rain and snow. Fouling increases the roughness of the blade surface and significantly reduces the annual energy production of wind turbines. Designing an airfoil with low sensitivity to roughness is an effective solution to reduce or eliminate the influence of attached dirt on the aerodynamic performance of the airfoil, thereby ensuring the efficient operation of the wind turbine under rough blade surface conditions. [0003] The direct...

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Problems solved by technology

[0005] Although researchers have done a lot of research on the optimal design of the airfoil and the modification of the blunt trailing edge over the years, and both the optimized design and the modification of the blunt trailing edge can improve the aerodynamic performance of the airfoil with rough surface, but the airfoil with the blunt trailing edge The influence of the blunt trailing edge thickness and its distribution ratio on the upper and upper sides of the mid-arc in the parameterized expression of the line and the research on the optimal design have not involved

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