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Harmonic balance Navier-Stokes aerodynamic analysis of horizontal axis wind turbines in yawed wind

机译：偏航中水平轴风力发电机的谐波平衡Navier-Stokes空气动力学分析

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Multimegawatt horizontal axis wind turbines often operate in yawed wind transients, in which the resulting periodic loads acting on blades, drive-train, tower, and foundation adversely impact on fatigue life. Accurately predicting yawed wind turbine aerodynamics and resulting structural loads can be challenging and would require the use of computationally expensive high-fidelity unsteady Navier-Stokes computational fluid dynamics. The high computational cost of this approach can be significantly reduced by using a frequency-domain framework. The paper summarizes the main features of the COSA harmonic balance Navier-Stokes solver for the analysis of open rotor periodic flows, presents initial validation results on the basis of the analysis of the NREL Phase VI experiment, and it also provides a sample application to the analysis of a multimegawatt turbine in yawed wind. The reported analyses indicate that the harmonic balance solver determines the considered periodic flows from 30 to 50 times faster than the conventional time-domain approach with negligible accuracy penalty to the latter.
机译：数兆瓦的水平轴风力涡轮机通常在偏航的风力瞬态下运行，其中，作用在叶片，传动系统，塔架和基础上的所得周期性载荷会对疲劳寿命产生不利影响。准确地预测偏航的风力涡轮机的空气动力学特性和由此产生的结构载荷可能是具有挑战性的，并且将需要使用计算上昂贵的高保真非定常Navier-Stokes计算流体动力学。通过使用频域框架，可以大大降低这种方法的高计算成本。本文总结了COSA谐波平衡Navier-Stokes求解器用于分析开放转子周期性流的主要特征，在NREL VI期实验分析的基础上给出了初步验证结果，并为该模型提供了示例应用兆瓦级风力发电机在偏航中的振动分析。报告的分析表明，谐波平衡求解器确定的周期性流量比常规时域方法快30至50倍，而传统时域方法的精度损失可忽略不计。

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