Design method of stall type wind turbine airfoil

Abstract

The invention relates to a design method of a stall type wind turbine airfoil. The method aims at a horizontal-axis wind turbine blade airfoil profile. The invention provides a wing section design method for locally adopting an elliptical concave profile on a wing section suction surface. The maximum lift-drag ratio before stall and the maximum lift-drag ratio after stall is taken as a multi-objective function, on the basis of the DU97-W-300 airfoil profile, the airfoil profile suction surface is locally expressed by adopting an elliptic function, and airfoil profile optimization design is performed by utilizing a multi-objective simulated annealing algorithm to obtain a target airfoil profile. The new airfoil designed by the invention has an obvious delayed stall characteristic, the rearstall aerodynamic performance is obviously improved, and compared with the traditional horizontal-axis wind turbine blade airfoil, the new airfoil has more excellent rear stall aerodynamic performance, so that the blade can generate more wind energy in a stall state.

Description

technical field [0001] The invention relates to the design field of large-thickness airfoils of horizontal-axis wind turbine blades, in particular to a design method for stall-type wind turbine airfoils. Background technique [0002] At present, the research on the thicker airfoil of wind turbine blades focuses on the aerodynamic performance before the stall, and few scholars have studied the improvement of the aerodynamic performance of the airfoil after the stall. However, due to the large thickness airfoil of the horizontal axis wind turbine blade (for example, the maximum relative thickness is 30%, 40%, etc.), it usually operates under the stall condition. Therefore, it is particularly important to improve the aerodynamic performance of wind turbine blades under stall conditions. Generally, the airfoil of a wind turbine is designed under a certain design angle of attack. The aerodynamic performance of the airfoil is better before the stall, but the aerodynamic performan...

AI Technical Summary

Problems solved by technology

Generally, the airfoil of a wind turbine is designed under a certain design angle of attack. The aerodynamic performance of the airfoil is better before the stall, but the aerodynamic performance of the airfoil drops more severely after the stall.

In the prior art, a unique local expression method of the airfoil suction surface profile is not used to change the flow field distribution after the airfoil stalls

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