潮流能水轮机复合材料叶片优化设计

Optimal design of composite blades of tidal current energy turbine

叶片是潮流能水轮机组的主要获能部件,设计良好、质量小、稳定性佳的叶片对潮流能水轮机组的正常运行起着重要作用。为了解决100 kW潮流能水轮机复合材料叶片的材料利用率较低、叶片自重较大的问题,对复合材料叶片的内部结构进行优化设计,并利用有限元软件ANSYS建立叶片的三维模型,在考虑不同铺层方案的情况下,对叶片的蒙皮、主梁和腹板的厚度进行优化。优化结果表明,优化后叶片的质量降低了13.97%。考虑到叶片容易失稳的特点,对优化后的叶片进行屈曲敏感性分析,分析发现,蒙皮厚度和主梁厚度对叶片稳定性的影响最大。

Blade is the main energy conversion device for tidal current energy turbine, A blade will play an important role in the turbine operation if it has light weight and stable performance. In this paper, the internal structures of the composite blade for 100 kW tidal energy turbine were optimized to solve problems of low material utilization ratio and larger weight of blade. A 3 D finite element（FE） model was established in the FE code ANSYS. The skin of blades, main beam and the web were optimized considering different stacking sequences. The results show that the weight of blades can be reduced by 13.97%. In light of the blade may be lack of stability, the buckling sensitivity analysis was carried out, and the results draw a conclusion that the thicknesses of skin and main beam have the greatest effect on the stability of the blade.