风力机叶片气动性能设计研究

Research on Blade Aerodynamic Design of Wind Turbine

在风力机组叶片的设计参数中,弦长、扭角和主要翼型沿叶片展向的安放位置对叶片的气动性能有着极其重要的影响。基于动量叶素理论,考虑叶片损失、推力修正和叶片厚度、宽度对叶素攻角的改变等因素,编写了风力机气动性能计算程序。发展了基于遗传算法,以叶片弦长、扭角和主要翼型沿叶片展向安放位置作为变量,以风能资源利用系数最大化为目标的风力机叶片气动性能设计方法。并给出算例,得到一种风能利用系数为0.480 7的风力机叶片,证明了该方法的可行性。

In blade design parameters of wind turbine, the blade chord length, twist angle and the airfoil distribution along blade direction has a very important influence on the aerodynamic performance of blade. Based on momentum-blade theory, the wind turbine aerodynamic performance calculation program is compiled, in which, the blade loss, thrust correction and the change of angle of attack caused by different blade thickness and width are considered. Taking blade chord length, twist angle and the position of main airfoils as variables, and maximum wind energy utilization coefficient as object, the wind turbine blade aerodynamic design method is developed based on Genetic Algorithm. An example calculation obtaining a wind turbine blade with a wind energy utilization coefficient of 0. 480 7 proves the feasibility of method.