Zheng Qi, Gao Zhiying, Zhao Baozhong, Bai Yefei, Su Rina, Han Xiaoliang, Zhao Feng, Dong Xueqing, Wang Jianwen
Key Laboratory of Wind Energy and Solar Energy Utilization Technology of Ministry of Education, Inner Mongolia University of Technology, Hohhot, 010051, China.
Inner Mongolia University Renewable Energy Engineering Research Center, Inner Mongolia University of Technology, Hohhot, 010051, China.
Heliyon. 2024 Aug 29;10(17):e37039. doi: 10.1016/j.heliyon.2024.e37039. eCollection 2024 Sep 15.
Aiming at the large aspect ratio characteristics of large wind turbines, it is easy to cause irreversible damage due to flutter during operation. A two-degree-of-freedom (plunge and pitch) flutter test bench was built using the time domain and frequency domain analysis methods of dynamic signals. The influence of different centroid positions on the flutter boundary was studied. The test shows that the closer the centroid position is to the leading edge of the wing segment, the better the aeroelastic stability of the wing segment is. Under the linear condition, the forward movement of the centroid position has a more significant influence on the flutter. In addition, the main reason for the wing flutter is related to the decrease of net damping and the coupling of the aeroelastic natural frequency of the pitching and plunging motions. The pitch motion is dominant in the two-degree-of-freedom motion. The farther the centre of mass is from the torsion axis, the greater the pitch and plunge motion displacement. The pitch motion has a more significant impact on the system than the plunge motion. Therefore, the study of flutter suppression should focus on pitch motion.
针对大型风力发电机组叶片大展弦比的特点，其在运行过程中容易因颤振而导致不可逆的损坏。利用动态信号的时域和频域分析方法搭建了一个二自由度（沉浮和俯仰）颤振试验台。研究了不同质心位置对颤振边界的影响。试验表明，质心位置越靠近翼段前缘，翼段的气动弹性稳定性越好。在线性条件下，质心位置向前移动对颤振的影响更为显著。此外，叶片颤振的主要原因与净阻尼的减小以及俯仰和沉浮运动的气动弹性固有频率的耦合有关。在二自由度运动中，俯仰运动占主导地位。质心离扭转轴越远，俯仰和沉浮运动位移越大。俯仰运动对系统的影响比沉浮运动更为显著。因此，颤振抑制的研究应侧重于俯仰运动。
