Aerodynamic Optimization Design of Wind Turbine Airfoil Based on Weighted Kriging Model
School of Automotive Engineering, Xiangtan Institute of Technology, Xiangtan 410219, China
| Abstract: | The design theory of wind turbine airfoil is the fundamental factor determining the power characteristics of a wind turbine. By altering geometric parameters such as maximum relative thickness, maximum camber, and leading-edge radius of the airfoil, different geometric shapes and aerodynamic performance of the wind turbine airfoil can be achieved. However, the existing airfoil design methods suffer from low computational efficiency and poor sample convergence, which may result in inadequate aerodynamic performance of the wind turbine airfoil. To address the shortcomings mentioned above, an improved optimization algorithm utilizing a weighted Kriging model is proposed based on the parameterized model of the wind turbine airfoil. Firstly, the weighted Kriging model is combined with a Pareto multi-objective optimization method that incorporates a niche genetic algorithm. This approach utilizes the efficient predictive performance of the weighted Kriging model and the nonlinear numerical processing capability of the Pareto multi-objective optimization method to achieve multi-objective aerodynamic optimization design of the wind turbine airfoil. Secondly, aiming to maximize the lift-to-drag ratio and lift coefficient of the wind turbine airfoil, with constraints on the moment coefficient, maximum relative thickness and its position, as well as the location of the upper surface transition point, a multi-objective aerodynamic optimization design model for a specific relative thickness wind turbine airfoil is established based on the weighted Kriging model and the Pareto multi-objective optimization method. The optimized design results include the improvement of lift-to-drag ratio characteristics by a factor of 2 when considering the optimized angle of attack. Finally, while ensuring the rationality of the wind turbine airfoil structure, recommendations are made to improve its aerodynamic performance. These suggestions provide engineering guidance for enhancing the aerodynamic performance of wind turbine airfoils. |
| Keywords: | Kriging Model; Multi-objective Optimization Design; Aerodynamic Characteristics; Wind Turbine Airfoil |
| DOI: | 10.57237/j.mse.2023.03.001 |
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Received: 19 July 2023
Accepted: 31 August 2023
Published Online: 8 September 2023
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