Method for optimizing power generation performance of wind turbine generator under low air density

Abstract

The invention relates to a method for optimizing power generation performance of a wind turbine generator under low air density. The method comprises: calculating an induced velocity flow field by utilizing a dynamic inflow model, and establishing a dynamic stall model of the blade airfoil; generating a grid of an airfoil flow field computational domain by adopting CFD software; carrying out dynamic stall model simulation analysis on changes of shape parameters and position parameters of the vortex generator by the blade airfoil; and carrying out optimal design on the aerodynamic characteristics of the blade airfoil according to the shape parameters and the position parameters of the vortex generator through an optimal algorithm from the two aspects of the maximum power coefficient and themaximum lift-drag ratio of the designed attack angle alpha, and obtaining the optimal parameters of the vortex generator. The method has the advantages that the vortex generators are reasonably arranged on the wind generating set, so that the problems of blade stall and wind power blade flow separation easily caused by the large-thickness airfoil blade under the conditions of large attack angle,high altitude, low air density and the like are solved.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method for optimizing the power generation performance of a wind turbine under low air density. Background technique [0002] With the gradual increase in the design power of wind turbines, the size of the blades is getting longer and longer. Due to the relatively thin thickness of the blade airfoil of the unit, the blade is prone to fracture when subjected to greater strength and load. In order to meet the high-power conditions, a large-thickness airfoil has been developed to improve the structural strength of the blade, but the large-thickness airfoil has a fatal shortcoming that is poor stall characteristics, especially under the condition of a large angle of attack, it is easy to cause the blade stall. Wind turbine blades are key components for directly capturing wind energy, and their flow conditions determine the efficiency of wind energy utilization. In ...

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Problems solved by technology

[0004] The invention mainly solves the problem that the wind turbine may not be able to maintain the maximum power generation after the installation of the vortex generator, and provides the distribution function of the chord length and twist angle of the blade airfoil obtained based on the classical momentum blade element theory, and establishes the blade airfoil after the installation of the vortex generator The simplified model, based on the ANSYS FLUENT numerical simulation method and combined with the classical momentum blade theory, studies the influence of the shape parameters and position parameters of the vortex generator on the aerodynamic characteristics of the airfoil, and obtains the optimal design parameters of the vortex generator through the optimal control algorithm. The blade still has a relatively high lift coefficient after the vortex generator is installed, and the tip speed ratio is kept optimal, so that the wind turbine can obtain the maximum power coefficient, thereby ensuring the maximum power generation performance of a wind turbine under low air density Optimization

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