大型柔性风电叶片气弹响应分析

AEROELASTIC RESPONSE ANALYSIS OF LARGE FLEXIBLE WIND TURBINE BLADES

风力机的大型化、深水化发展使得叶片尺寸急剧增加,长柔叶片的气弹效应日趋显著。该文以某95 m叶片为研究对象,基于BEM方法和多体动力学理论构建气动结构耦合方程并求解极端风载条件下的叶片气弹响应。系统地研究了发生颤振现象后叶片的振动特征及不同转速条件下的叶片阻尼特性,发现摆振负阻尼是诱导叶片发生颤振失稳的关键因素;同时通过平行对照分析了空气密度、变桨角度等因素对大型叶片气弹稳定性的影响。

The aeroelastic effect of flexible blades is becoming increasingly significant with the rapid development of wind turbines and the sharp increase in blade length.Based on blade element momentum(BEM)theory and multi-body dynamics theory,the aerodynamic structure coupling equation of 95 m blade is established,and the aerodynamic response of blades under extreme wind load is analyzed which include a detailed study of the vibration characteristics of the blades after flutter and the damping characteristics of the blades under different speed conditions.According to the research,negative damping oscillation is a key factor causing blade flutter instability.At the same time,the influence of density of air,pitch angle and other factors on the aeroelastic stability of large blades are analyzed by parallel comparison method.