风力机的叶片翼型设计及性能分析

Airfoil Design and Performance Analysis of Wind Turbine Blades

优良的叶片翼型结构对提高风力机的气动性能起着关键的作用.选用两种现有翼型进行组合设计出新翼型.先利用翼型解析式选取出符合要求的两个初始翼型,模拟分析提取出两个翼型的优势上、下表面,上下圆滑连接后合成新翼型.研究发现:新翼型的结构参数更优.通过实验验证了模拟方法的可靠性且发现新翼型构成的风机叶片要比两个初始翼型构成的风力机做功能力强,输出功率更高.在攻角因素下新翼型的升力系数相较可提高到10%以上;阻力系数降低且波动较小;获得最大升阻比时在所分析的翼型中攻角最小,叶片旋转启动时间变快.不同来流风速下升力系数可达0.9以上;阻力系数最小可减少摩擦和沿程气流回旋;升阻比相较之下可提高到20%、30%以上.自身静平衡性也更加稳定.

Excellent blade airfoil structure plays a key role in improving the aerodynamic per-formance of wind turbines.Two existing airfoils were now used in combination to design a new airfoil.First,the two initial airfoils that meet the requirements are selected by using the analytical expression of airfoils.the upper and lower surfaces of the two airfoils are extracted by simulation analysis,a new airfoil is formed by smooth upper and lower connection.Re-search found that:the structural parameters of the new airfoil are better.The reliability of the simulation method is verified through experiments and found that the wind turbine blade formed by the new airfoil has stronger functions and higher output power than the wind tur-bine formed by the two initial airfoils.The lift coefficient can be increased to more than 10%under the angle of attack factor;reduced drag coefficient and less fluctuation;the maximum lift-drag ratio is obtained with the smallest Angle of attack in the airfoil analyzed,the blade.rotation start time becomes faster;the lift coefficient can reach above 0.9 under different incoming wind speeds;the minimum drag coefficient can reduce friction and airflow rotation a-long the path;the lift-to-drag ratio can be increased to 20%or more than 30%.Self-static balance is more stable.