FLUTTER ANALYSIS AND PARAMETER SENSITIVITY STUDY OF ULTRA-LARGE WIND TURBINE BLADES

Li Bei; Tian De; Tang Shize; Tao Lizhuang; Wu Xiaoxuan; Liu Feng

doi:10.19912/j.0254-0096.tynxb.2022-0669

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (9) : 295-301. DOI: 10.19912/j.0254-0096.tynxb.2022-0669

FLUTTER ANALYSIS AND PARAMETER SENSITIVITY STUDY OF ULTRA-LARGE WIND TURBINE BLADES

Li Bei, Tian De, Tang Shize, Tao Lizhuang, Wu Xiaoxuan, Liu Feng

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Abstract

Taking the IEA wind 15MW reference wind turbine as the research object, the aeroelastic coupling analysis model of the blade is established based on the modified blade element momentum theory on a polar grid and Timoshenko beam model. And the aeroelastic stability of the ultra-long blades is studied in the runaway situation by combining time-domain and frequency-domain methods. The results show that the blade flutter occurs when the critical rotor speed is 13.06 r/min, and the flutter frequency is 3.68 Hz, whose dominant mode shapes are the third-order forward flapwise mode and the first-order forward torsional mode. Besides, the sensitivities of critical flutter speed to air density, blade mass, section center of gravity, flapwise stiffness, and torsional stiffness are quantitatively analyzed. As a result, it is demonstrated that torsional stiffness is the dominant factor affecting the critical flutter speed, and the flutter margin can be improved by reducing the blade mass, shifting the cross-sectional center of gravity forward, and increasing the flapwise and torsional stiffness. In addition, it can obtain a more conservative design-rated rotor speed by considering high air density.

Key words

wind turbines / aeroelasticity / flutter / modal analysis / sensitivity analysis

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Li Bei, Tian De, Tang Shize, Tao Lizhuang, Wu Xiaoxuan, Liu Feng. FLUTTER ANALYSIS AND PARAMETER SENSITIVITY STUDY OF ULTRA-LARGE WIND TURBINE BLADES[J]. Acta Energiae Solaris Sinica. 2023, 44(9): 295-301 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0669

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