摘要
以美国可再生能源试验室公开的5 MW风力机(NREL-5MW)为原型,试验模型几何缩尺比为1∶50,使用动量叶素理论(BEM理论)计算叶片风轮推力。为改善模型试验叶片的尺度效应,变化模型叶切面的翼型和分布,对风轮推力进行计算和分析。以此为基础,选取叶切面的弦长和转角作为优化变量,以风轮推力为优化目标,建立优化数学模型,使用模矢搜索法和罚函数法求解,得到能较准确模拟风轮推力的试验用叶片。
In the wave basin model test of floating wind turbine, Froude scaling law should firstly be applied. However, the inconsistency in the scaling of Reynolds number, which is widely known as scale effect, makes the rotor thrust in model test far less than the target thrust scaled by the Froude law. A 5 MW wind turbine of the National Renewable Energy Laboratory （NREL-5 MW） was used as prototype, and model turbine had a scaling factor of 1：50. By utilizing the Blade Element Momentum Method （BEM method）, the rotor thrust of both prototype turbine and model turbine were calculated and analyzed. In order to improve the rotor thrust of the model turbine, airfoil types of the blade cross sections were adjusted. On basis of the adjustment of model blade, an optimization model for the rotor thrust was built by choosing the blade chord length and twist angle as optimization variables. The pattern search method and penalty method were selected to solve the optimization model. It was found that the optimal designed model blade matched the target rotor thrust well, thus it could be served as a better reference for the floating wind turbine model test in the wind and wave basin.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2014年第10期1923-1929,共7页
Acta Energiae Solaris Sinica
基金
上海交通大学海洋工程国家重点实验室自主研究课题(GKZD010056-2)
国家重点基础研究发展(973)计划(2014CB046200)
关键词
浮式风力机
水池试验
尺度效应
风轮推力
叶片优化
floating wind turbine
basin model test
scale effect
rotor thrust
blade optimization
