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本文利用商用CFD软件Numeca针对NREL Phase VI风轮结冰前后进行数值计算,计算包含风速由5 m/s至17 m/s区间各典型工况,并对计算结果进行了气动参数和载荷等相关分析。由此得出结论:结冰可以带来最高达51%的功率损失,同时会使风力机提前失速以及提高了启动风速等;结冰会导致在较高风速下叶根挥舞弯矩急剧增大从而增大叶片叶根强度要求;另一方面由叶片沿展向载荷分布得出结冰对整机影响主要集中在大于90%叶展的外侧区域,该区域是除冰防冰系统主要作用区域。
In this paper, commercial CFD software Numeca was used to calculate the typical conditions before and after the freezing of NREL Phase VI wind wheel. The typical working conditions including the wind speed from 5 m / s to 17 m / s were calculated. The calculation results were related to the aerodynamic parameters and load analysis. The conclusion is that icing can bring up to 51% of the power loss, meanwhile, it will cause the wind turbine to stall ahead of time and increase the starting wind speed, etc. The icing will lead to sharp increase of the bending moment of the blade root at higher wind speed Thus increasing the leaf blade root strength requirements; on the other hand, the distribution of the blade along the span shows that the impact of icing on the whole machine is mainly concentrated in the outer area of more than 90% of the leaf blade, which is the main area of deicing / ice protection system .