Design Method of Airfoil for Stall Wind Turbine

Abstract

The invention relates to a design method for the airfoil of a stall type wind turbine. The method proposes an airfoil design method in which an elliptical concave profile is locally used on the suction surface of the airfoil, aiming at the airfoil of a horizontal axis wind turbine. The lift-drag ratio and the maximum lift-drag ratio after stall are multi-objective functions. On the basis of the DU97‑W‑300 airfoil, the airfoil suction surface is partially expressed by an elliptic function, and the multi-objective simulated annealing algorithm is used to optimize the airfoil local profile. The design obtains the target airfoil. The new airfoil designed by the invention has obvious delayed stall characteristics, and the aerodynamic performance after stall is obviously improved. Compared with the traditional horizontal axis wind turbine blade airfoil, the new airfoil has better aerodynamic performance after stall. , so that the blade can generate more wind energy even in the stall state.

Description

technical field [0001] The invention relates to the field of design of large-thickness airfoils of horizontal-axis wind turbine blades, in particular to a design method of stall-type wind turbine airfoils. Background technique [0002] At present, the research on airfoils with larger thickness of wind turbine blades focuses on the aerodynamic performance before stall, and few scholars study the improvement of aerodynamic performance after stall. However, due to the large thickness airfoils of horizontal axis wind turbine blades (eg, 30%, 40% maximum relative thickness, etc.), they usually operate under stall conditions. Therefore, it is particularly important to improve the aerodynamic performance of wind turbine blades under stall conditions. Generally, the airfoils of wind turbines are designed under the condition of a certain design angle of attack. The aerodynamic performance of the airfoils is good before stalling, but the aerodynamic performance of the airfoils after ...

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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