Dynamic response mechanism of raindrop impact on leading edge of large wind turbine blades

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (21) : 1-11.

ZHANG Jianyu1, FENG Mengjie1, GUO Xu2, DU Xiaozhong3

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Abstract

With the increasing scale of offshore wind turbine design in recent years, the problem of rain erosion failure at the leading edge of the blades has become increasingly prominent, which not only affects the wind energy conversion efficiency, but also poses a potential threat to the stable operation of the structure. The smooth particle dynamics (SPH) is used to study the constitutive relationship inside the raindrop, and the RVE model of the leading edge of the blade is founded by FEM modeling. SPH-FEM coupled model is then established to investigate the impact response of the blade surface by raindrop impingement. With the actual rainfall conditions in consideration, the raindrop size distribution model related to rainfall intensity and the spatial distribution model are established. By simulating the impact of a single raindrop, the impact loading on blade surface and the velocity field inside the raindrop are studied. Through the analysis of the stress and strain fields induced by the impact, potential damage areas are evaluated. Through the multi raindrop impact simulation, the coupling effect between impact stress fields and the cumulative effect of plastic strain on the coating surface are evaluated. The results have indicated that water hammer impact is the key factor for the accumulation of plastic strain. Although the stress amplitude during the lateral spraying stage is small and shows disordered characteristics, the stress maximum will appear in the coupling zone and has a potential impact on blade deformation and failure if there is coupling impact among multiple raindrops.

Key words

wind turbine / blade leading edge / SPH-FEM coupled model / single raindrop impact / multiple raindrop impacts

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ZHANG Jianyu1, FENG Mengjie1, GUO Xu2, DU Xiaozhong3. Dynamic response mechanism of raindrop impact on leading edge of large wind turbine blades[J]. Journal of Vibration and Shock, 2024, 43(21): 1-11

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