摘要
采用全自由方式建立风力机尾流场的涡尾迹模型,引入"虚拟周期"的概念,并发展一种自适应松弛因子方法,从而改善了自由尾迹迭代的稳定性,提高了迭代收敛速度。利用建立的自由涡尾迹模型,计算了风力机叶片的尾流场结构、气动性能及叶片载荷,并与实验结果进行了对比分析。结果表明,尖速比越大,自适应松弛因子方法对缩小模型计算时间越有效;全自由涡尾迹模型能准确给出风力机尾流场的结构,包括尾迹的扩张以及叶尖涡和叶根涡的产生、发展和耗散的过程,风轮扭矩与实验数据吻合;叶片载荷分布的计算结果在低风速下与实验值基本一致,但是在大风速下差别较大,说明需要一个准确的失速模型。
A fully free vortex wake model of flow field and aerodynamic performance for wind turbine is presented.The dummy period concept is used to improve the convergence speed and stability of wake iterations with an introduction of the adaptive relaxation.The wake structure,the aerodynamic performance and loads of wind turbine are predicted by the present model and compared with the experiment results.The adaptive relaxation factor method can reduce the computational overhead especially at the high tip speed ratios.The fully free vortex wake model can accurately predict the flow field structure including wake expansion and the developing process from generation to dissipation of blade tip and root vortices.The rotor torque agrees well with the experiment data.As for blade load distribution,the calculation compares well with experiment at low wind speeds but diverges at high wind speeds,indicating that an appropriate stall model is required for accurate prediction at high speeds.
出处
《计算力学学报》
CAS
CSCD
北大核心
2013年第6期822-827,共6页
Chinese Journal of Computational Mechanics
基金
国家自然科学基金(11172135)
国家科技支撑计划(2009BAA22B03)
江苏省优势学科建设工程
南京航空航天大学基本科研业务费专项科研(NJ2011003)资助项目
关键词
风力机
全自由涡尾迹
虚拟周期
自适应松弛
wind turbine fully free vortex wake dummy period adaptive relaxation
