Flat opening separation airfoil profile design method based on parabolic function

Abstract

The invention relates to a flat opening separation airfoil profile design method based on a parabolic function, and provides a flat opening separation airfoil profile optimization design method based on the parabolic function on the basis of an airfoil profile S818 developed by an American renewable energy source laboratory, and the flat opening separation airfoil profile optimization design method based on the parabolic function is designed by taking the maximum airfoil profile lift-drag ratio under the condition of a certain attack angle as a target function and two parabolic parameters as design variables. Making a constraint is carried out on design variables and related parameters, and control and parameter optimization of the separated airfoil profile of the wind driven generator are realized by adopting a simulated annealing multi-objective evolutionary algorithm. Large fluid calculation software fluent is coupled to the algorithm program to calculate the aerodynamic performance of the airfoil. Finally, aerodynamic performance comparative analysis is performed on the optimally designed S818 flat opening separation airfoil profile and the airfoil profile S818 in an American renewable energy laboratory. The new airfoil profile designed by the method is adopted to replace a traditional bladeairfoil profileof the horizontal-axis wind driven generator, and good social value and economic benefits are achieved.

Description

technical field [0001] The invention relates to a method for designing a flat-mouth separation airfoil based on a parabolic function, and also relates to improving a special airfoil for a high-aerodynamic performance wind machine according to the method. Background technique [0002] At present, the research on the airfoil of wind turbine blades focuses on the aerodynamic performance of the continuous airfoil profile, and few scholars have studied the design method and aerodynamic performance of the separated airfoil. In general, the airfoil of a wind turbine expresses the airfoil profile with a certain mathematical function under a certain design angle of attack, and takes the lift-to-drag ratio as the objective function, and uses an optimization algorithm to design a special airfoil for wind turbines with better aerodynamic performance. The present invention is different from the previous airfoil profile design method, and proposes a design method based on the parabolic fu...

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Problems solved by technology

[0002] At present, the research on the airfoil of wind turbine blades focuses on the aerodynamic performance of the continuous airfoil profile, and few scholars have studied the design method and aerodynamic performance of the separated airfoil

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