浓缩风能型风力发电机多叶片风轮模态分析
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摘要
以六叶片结构的浓缩风能型风力发电机风轮为研究对象,采用锤击法对单叶片、三叶片、六叶片风轮进行模态分析,得到其试验模态参数。试验结果表明:随着叶片数量的增加,风轮一阶挥舞固有频率的个数增多,共振的概率变大,虽然振型整体为挥舞振型,但同一风轮中的各叶片的振动幅值存在差异,导致风轮的振动形式变得更加复杂。浓缩风能型风力发电机六叶片风轮转动频率6.67 Hz及其6倍频率40.02 Hz避开了共振区间在71.14-108.32 Hz,风轮共振几率较小,为后续浓缩风能型风力发电机风轮研究提供依据。
The concentrated wind energy turbine rotors of six-bladed structure are considered as research object. The modal analysis of single-bladed, three-bladed and six-bladed rotors are is adopted by hammer method, and the experimental modal parameters are obtained. The experimental results show that the probability of resonance increases with the increase of the number of blades, the number of the first flapping natural frequencies of the rotors increases. Although the whole modal shape is a flapping modal, the vibration amplitude of each blade in the same rotor is different, and just because of this, the vibration forms of the rotors become more complicated. The rotation frequency of the six-bladed rotor of concentrated wind energy turbine is 6.67 Hz and its 6 times frequency is 40.02 Hz, which avoid the resonance interval in 71.14-108.32 Hz. The resonance probability of rotors is small. This study provides evidence for the future research of concentrated wind energy turbine rotors.
The concentrated wind energy turbine rotors of six-bladed structure are considered as research object. The modal analysis of single-bladed, three-bladed and six-bladed rotors are is adopted by hammer method, and the experimental modal parameters are obtained. The experimental results show that the probability of resonance increases with the increase of the number of blades, the number of the first flapping natural frequencies of the rotors increases. Although the whole modal shape is a flapping modal, the vibration amplitude of each blade in the same rotor is different, and just because of this, the vibration forms of the rotors become more complicated. The rotation frequency of the six-bladed rotor of concentrated wind energy turbine is 6.67 Hz and its 6 times frequency is 40.02 Hz, which avoid the resonance interval in 71.14-108.32 Hz. The resonance probability of rotors is small. This study provides evidence for the future research of concentrated wind energy turbine rotors.
引文
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[2]Philippidis T P,Vionis P S.Composite rotor blade model verification by means of full-scale static and model testing[A]. Proc of EUWEC 96[C].1996,946-949.
[3]徐大平,柳亦兵,吕跃刚. 风力发电原理[M]. 北京:机械工业出版社, 2011.
[4]Spera D A.Wind turbine technology[M].New York:ASME Press,1994.
[5]Franz Mühle,Muyiwa S Adaramola, Lars Sretran.The effect of the number of blades on wind turbine wake-a comparison between 2-and 3-bladed rotors[J].Journal of Physics:Conference Series,2016,753(3).
[6]马剑龙,汪建文,魏海姣,等. 风力机风轮振动特性研究[J]. 工程热物理学报,2014,35(03):494-498.
[7]徐宝清. 水平轴风力发电机组风轮叶片优化设计研究[D].内蒙古农业大学,2010.
[8]田德,刁明光,王海宽. 浓缩风能型风力发电机三与四叶片叶轮的风洞实验研究[J]. 太阳能学报,2007,(01):74-80.
[9]叶枝全, 马昊旻, 丁康, 等. 水平轴风力机桨叶的实验模态分析[J]. 太阳能学报, 2001(04): 473-476.
[10] 黄小华, 李德源. 风力机叶片动力特性测试分析方法研究[J]. 长江大学学报(自然版)理工卷, 2007, (02): 92-94.
[11] 汪建文,赵志渊,刘博. 三叶片风轮动力学特性的分析[J]. 太阳能学报,2009,30(02):222-225.
[12] 马剑龙,汪建文,董波,等. 风力机风轮低频振动特性的实验模态研究[J]. 振动与冲击,2013,32(16):164-170.
[13] 汪建文,闫建校,刘金鹏,等. 多叶片风轮的试验模态测试与分析[J]. 太阳能学报,2008,29(12):1460-1464.