FLUTTER SPEED ANALYSIS OF BEND-TWIST COUPLED LONG FLEXIBLE BLADE
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摘要: 针对弯扭耦合叶片的颤振速度进行研究，提出基于FAST＿v8结合非线性几何精确梁理论评估叶片颤振速度的分析方法，基于典型截面失稳机理验证该分析方法的准确性。以某80.74 m叶片为研究对象，分析空气密度、叶片重心弦向位置、扭转频率、挥舞频率等参数变化对颤振速度的影响。结果表明，该80.47 m叶片颤振速度随空气密度增大而减小；质心前移可有效抑制经典颤振；提高扭转频率可提升叶片的稳定性；挥舞频率位于0.2～0.4 Hz之间时较合适。Abstract: The flutter speed of bend-twist coupled blades is studied. An analytical method based on FAST＿v8 and nonlinear geometrically accurate beam theory is proposed to evaluate blade flutter speed. The accuracy of the analytical method is verified based on typical section instability mechanism. Taking an 80.74 m blade as the research object,the effects of air density,the position of blade gravity,torsional frequency and flap-wise on flutter velocity are analyzed. The results show that flutter speed decreases with the increase of air density. Classical flutter can be effectively inhibited by centroid forward movement. Increasing torsional frequency can improve blade stability. It is suitable when the flap-wise frequency is between 0.2 and 0.4 Hz.
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Keywords:
- wind turbine /
- flutter speed /
- classical flutter /
- bend-twist coupling /
- blade
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