Blunt trailing-edge airfoil optimization design method for wind turbine

Abstract

The invention discloses a blunt trailing-edge airfoil optimization design method for a wind turbine. The method comprises the following steps: forming a blunt trailing-edge airfoil molded line parameter control equation set by adopting a wind turbine airfoil molded line integration theory and a B spline curve; taking a shape function coefficient of the airfoil, B spline control parameters, blunt trailing-edge thickness and a distribution ratio of the blunt trailing-edge on the upper side of a mean camber line as design variables, and establishing an asymmetrical blunt trailing-edge airfoil optimization design model; performing airfoil optimization design by utilizing particle swarm algorithm coupled XFOIL software, and providing a blunt trailing-edge airfoil optimization design method for the design variables, the blunt trailing-edge thickness and a distribution ratio of the blunt trailing-edge on the upper side of the mean camber line; obtaining a blunt trailing-edge design with the trailing-edge thickness of 2.61% chord length and the thickness distribution ratio of 0 to 1 aiming at S812 airfoil optimization, and researching the lift and drag coefficient and a lift-drag ratio of the original airfoil and the blunt trailing-edge design by adopting a CFD (computational fluid dynamics) method. According to the method disclosed by the invention, the aerodynamic performance of the blunt trailing-edge airfoil of the wind turbine is obviously improved, the wind energy utilization rate of the wind turbine is well improved, and the power generation cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of airfoil modification and optimization design, and in particular relates to a method for optimal design of an airfoil at the blunt trailing edge of a wind turbine by using computational fluid dynamics and an optimization algorithm. Background technique [0002] The blade is an important part of the wind turbine to capture wind energy, and the aerodynamic performance of its airfoil directly affects the wind energy utilization rate of the wind turbine. It is very important to design a wind turbine airfoil with good performance to improve the wind energy conversion rate of the blade. At present, the design methods of wind turbine airfoil mainly include inverse design and direct optimization. The direct optimization method can well solve the problem that it is difficult to give an appropriate target pressure and velocity distribution, and makes the multidisciplinary design of computational fluid dynamics (CFD...

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Problems solved by technology

The above research was carried out under the condition of separately considering the parametric expression of the airfoil profile and the modification of the blunt trailing edge, while the parametric expression of the airfoil profile of the blunt trailing edge included the thickness of the blunt trailing edge and its distribution ratio on the upper and upper sides of the center arc , and the research on the optimal design of the airfoil did not involve

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