ABSTRACT

Taking NREL 5 MW large offshore wind turbine as a research object, a theoretical model considering geometrical nonlinearity is established, and the dynamic response analysis is carried out. Besides, the blade scaled model is processed and used in the wind tunnel test. The numerical results show that the response values of displacement and Mises stress for the blade, as well as the increment of displacement and stress for each blade section, rise nonlinearly with the equal amplitude of incoming wind speed, regardless of the single-blade model or the whole machine model. The inter-structure coupling effect is more obvious with the increase in income wind speed. The difference of maximum blade displacement between two models first decreases and then increases along the wing span direction. Furthermore, the difference of Mises stress increases gradually with the same increment in incoming wind speed and decreases nonlinearly from the middle to both sides.

摘要

以NREL 5 MW大型海上风机为研究对象，建立了考虑几何非线性的理论模型，并进行了动力响应分析。此外，对叶片比例模型进行了处理，并在风洞测试中使用。数值结果表明，无论叶片是单叶片模型还是叶片模型，叶片的位移和Mises应力的响应值，以及每个叶片截面的位移和应力的增量均随输入风速的相等幅度而非线性上升。整机型号。随着收入风速的增加，结构间的耦合效应更加明显。两个模型之间的最大叶片位移之差先沿机翼跨度方向减小，然后增大。此外，