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针对风力机叶片,建立其结构动力学方程,推导分析了叶片旋转所产生的振动速度及其对来流的影响。基于BEM(Blade Element Momentum)理论,在风力机空气动力学基础上,建立了风力机的气动耦合分析模型。应用该模型,对某2MW风力机进行了计算分析,得到了叶片在额定工作风速下的振动变形、速度、加速度以及叶片沿展向的变形和载荷分布。充分考虑叶片的结构振动特性与来流风速的耦合效应,使得风力机空气动力学特性模型更加准确,对于风力机的设计和分析具有重要意义。
Aiming at the wind turbine blade, the structural dynamic equation is established and the vibration velocity and its effect on the incoming flow produced by blade rotation are deduced and analyzed. Based on BEM (Blade Element Momentum) theory, based on the aerodynamics of wind turbine, the aerodynamic coupling model of wind turbine is established. Using this model, a 2 MW wind turbine was calculated and analyzed. The deformation, the velocity and the acceleration of the blade under the rated working wind speed and the deformation and load distribution along the span of the blade were obtained. Taking full account of the coupling effect between the structural vibration characteristics of the blade and the incoming wind speed, the aerodynamic characteristics model of the wind turbine is more accurate, which is of great significance for the design and analysis of the wind turbine.