水平轴风力机柔性叶片气动弹性响应分析  

RESPONSE ANALYSIS OF AEROELASTICITY FOR HAWT FLEXIBLE BLADE

作　　者：陈严[1] 张林伟[1] 刘雄[1] 叶枝全[1] 

机构地区：[1]汕头大学能源与环境科学研究所,汕头515063

出　　处：《太阳能学报》2014年第1期74-82,共9页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51076088);广东省学科建设专项(cgzhzd0908)

摘　　要：基于模态分析法,通过二节点悬臂梁单元对柔性叶片进行离散化分析,得到水平轴风力机柔性叶片在挥舞、摆振和扭转方向上的固有特性;利用Newmark常平均加速度法和振型解耦实现各阶的振型结构动力响应分析。以某5MW大型风力机为例,分析高阶特征模态对叶片动态响应的影响,同时考虑截面扭角变化前后对气动弹性载荷的反馈作用。结果表明,大型风力机柔性叶片在旋转过程中的振动和变形相当大,截面扭转变化对风力机的气动弹性问题有较大影响。In this paper, the natural characteristic of the flexible blade of Horizontal Axis Wind Turbine in flapwise/ edgewise and torsion directions was obtained, based on modal analysis theory, through two-node cantilever beam discrete element analysis. The analysis of structure dynamic response was achieved using constant average acceleration method of Newmark and uncoupling every mode of the vibratiorr Take a 5MW HAWT for example, the effect of higher- order characteristic modes on the dynamic response of the blade was analyzed. Furthermore, the variation of aerofoil section twist angle and the feedback effects on the aeroelasticity loads was considered. The results showed that the flexible blade of large wind turbines subjects to significant vibration and deformation in the process of rotating; and the aerofoil section torsion change has a great iiffluence on the aerodynamic characteristic of the large scale wind turbines.

关 键 词：气动弹性 柔性叶片 扭转 反馈作用 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]