水平轴风力机叶片弯弯耦合气弹响应分析  

ANALYSIS ON BENDING-BENDING COUPLED AEROELASTIC RESPONSE OF HORIZONTAL AXISWIND TURBINE BLADES

作　　者：陈刚[1] 陈进[1] 庞晓平[1] Chen Gang;Chen Jin;Pang Xiaoping(State Key Laboratory of Transmission,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400044

出　　处：《太阳能学报》2020年第5期70-76,共7页Acta Energiae Solaris Sinica

基　　金：国家高技术研究发展(863)计划(2012AA051301);国家自然科学基金(51175526)。

摘　　要：为分析风力机叶片的振动行为,采用Hermite梁单元对叶片进行离散。将叶片的振动行为嵌入到气动力的计算中,建立气动弹性耦合的分析模型。将叶片的气动阻尼系数运用到虚功原理推导其气动阻尼矩阵,再与结构阻尼矩阵叠加生成总阻尼矩阵。根据叶片的几何和结构特征,深入分析叶片弯弯耦合产生的原因。得到弹性耦合项和阻尼耦合项,然后建立弯弯耦合动力学方程,采用常加速度假设法求解方程。以NREL 5 MW风力机为例,对其在额定风况下的剪切流进行仿真。结果表明,考虑弯弯耦合计算的叶片振动位移和速率比不考虑弯弯耦合时更大;叶片振动速率相比诱导速度(叶素动量理论)不能被忽略。To investigate the vibration behaviour of wind turbine blade,the Hermite beam element model is introduced to discrete the blade. Embedding the vibration behaviour into the calculation of aerodynamic loads to build the aerodynamicelastic coupling model. The aero-damping matrix is derived by substituting the aero-damping coefficient into the virtual work principle,and then superposed with the structure-damping matrix to generate the overall damping matrix. Based on the geometrical and structural characteristics of blade,the bending-bending coupled is investigated thoroughly. Then the elastic coupled terms and the damping coupled terms are obtained to build the bending-bending coupled dynamic equations.The equations are solved based on the average acceleration assumptions. The NREL 5 MW wind turbine is simulated at rated wind speed considered the shear flow. The simulation results indicate that the vibration displacements of bendingbending coupled are greater than that of bending-bending independent. The velocities of vibration can not be neglected when put them together with the induced velocities(BEM).

关 键 词：风力机叶片 气弹响应 气动阻尼 弯弯耦合 水平轴 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]