基于Davenport谱风机叶片旋转状态下的应力分析

为了确保风力机叶片安全可靠运行,对其进行了旋转工况下的应力分析.以UG建立的叶片实体模型为研究对象,运用更加贴近实际工况的Davenport风谱建立了近海风场,利用Newmark法求解了结构运动方程,并在与文献试验结果对比的基础上,数值模拟了叶片应力分布.研究结果表明,风力机叶片的位移响应与应力响应幅值均随来流风速的增加而增加,旋转速度和来流风速均对叶片在相对弦长和相对翼展方向上的最大mises应力变化趋势有明显影响,该结果可以为风力机叶片优化设计提供参考.

Stress analysis on wind turbine blade under rotating state based on Davenport spectrum

In order to ensure the safe and reliable operation of wind turbine blade, the stress was analyzed under rotating condition. Through taking the blade solid model established with UG software as the research object, the offshore wind field was established with Davenport wind spectrum closer to the actual working conditions, and the structure motion equation was solved with Newmark method. On the basis of comparing with the test results from the references, the blade stress distribution was numerically simulated. The results indicate that with increasing the incoming wind speed, the amplitudes of both displacement and stress response for wind turbine blade increase. In addition, both rotational speed and incoming wind speed have a significant influence on the variation trend of the maximum mises stress in both relative chord length and relative wingspan directions of blade. The present results can provide the reference for the optimization design of wind turbine blade.