摘要
针对基于分裂叶尖布局的概念型水平轴风力机的气动特性,利用计算流体力学(CFD)方法展开数值模拟研究,并与自由涡尾迹方法的分析结果进行了验证。在以NREL phase VI叶片为基本布局的基础上,研究了合理布局的分裂叶尖小翼之间的相互作用对大风速下风力机叶片流动分离与总体气动特性的改善效果。上述数值模拟结果均表明,通过合理设计分裂叶尖布局,叶尖小翼能够产生多个叶尖涡结构,并提供额外的前缘吸力峰值,对中大风速下风力机叶片整体性能起到有利的改善作用;另一方面,原始设计产生的单一集中涡得到分散,流向涡强度以及近尾迹区的诱导影响进一步受到削弱。在此基础上,借助于基因算法分别针对初步计算得到的各叶尖小翼的主要几何参数进行了多目标数值优化,获得了具有较高风能利用效率的分裂叶尖布局设计解集。
The aerodynamic characteristics of a conceptual horizontal-axis wind turbine blade with multi- ple winglets were numerically investigated by computational fluid dynamics （CFD） methods and were valida- ted with the free vortex wake method. With the prototype of NREL phase VI blade, the interaction between the reasonably designed winglets and the improvements of integrated performance were discussed. The re- sults from both CFD and free vortex wake simulations indicated that, with the current design, multiple tip vortex structures were formed from the winglets. The multiple vortices produce additional suction near the leading edges, which promises the improvements of total functioning of the blades at medium and high speeds. Meanwhile,the single tip vortex from the original design was distributed. The streamwise vorticity and then the induction influence was alleviated. Based upon the above work, the key geometrical parameters were optimized by a genetic algorithm code for multiple objectives. A set of optimum designs with high ener- gy conversion efficiency were obtained.
出处
《空气动力学学报》
CSCD
北大核心
2013年第1期127-131,共5页
Acta Aerodynamica Sinica
基金
国家自然科学基金(11172135)
空气动力学国家重点实验室开放基金(SLKA20110201)
江苏高校优势学科建设工程资助项目
南京航空航天大学基本科研业务费专项科研项目(NJ2011003)
关键词
风力机
分裂叶尖
数值模拟
基因算法
数值优化
wind turbine
multiple winglets
numerical simulation
genetic algorithm
.numerical optimization
