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针对风力机翼型泛函集成理论在中等厚度翼型(最大相对厚度约25%)优化设计过程中其控制参数难以界定的缺点,首次提出翼型集成理论与B样条曲线相结合的风力机翼型型线优化设计方法。建立翼型优化数学模型,采用改进的多目标粒子群算法与RFOIL软件耦合求解气动参数进行翼型优化设计。优化得到最大相对厚度为25%的新翼型CQU-250,该翼型具有良好的结构兼容性;并将该翼型与同等厚度的风力机翼型DU91-W2-250进行气动特性对比分析,分析结果表明新翼型在主要工作攻角范围内,光滑和粗糙两种条件下的升力系数均更高,升阻比更大,具有更高的设计与非设计工况。相比传统翼型,其气动性能明显提高,从而验证了该方法的可行性。
In view of the shortcomings of the functional theory of airfoil functional integration in the optimization design of medium-thickness airfoils (maximum relative thickness of about 25%), the wind turbine integration theory and B-spline curve wind turbine Airfoil line optimization design method. The airfoil optimization mathematical model is established. The improved multi-objective particle swarm optimization algorithm is coupled with the RFOIL software to solve the aerodynamic parameters to optimize the airfoil. The new airfoil CQU-250 with the maximum relative thickness of 25% is optimized, and the airfoil has good structural compatibility. The airfoil is compared with the aerodynamic characteristics of the equivalent airfoil DU91-W2-250 of the same thickness, The analysis results show that the new airfoil has higher lift coefficient, higher lift-drag ratio, and higher design and non-design working conditions in the main working angle of attack. Compared with the traditional airfoil, the aerodynamic performance is obviously improved, which proves the feasibility of this method.