Abstract An experimental study was conducted to characterize aerodynamic performance degradation of wind turbine blades induced by dynamic ice accretion process. The experimental study was performed in an Icing Research Tunnel with a turbine blade model under a typical glaze icing condition. Ice structures were found to accrete rapidly over both the upper and lower surfaces of the blade model after starting the ice accretion experiment. Irregular-shaped ice structures were found to disturb the airflow around the blade model greatly, resulting in large-scale flow separations and shedding of unsteady vortex structures from the ice accreting surface. The aerodynamic performance of the blade model was found to degrade significantly. The performance degradation induced by the ice accretion was found to be a strong function of the angle of attack of the blade model with more significant degradations at lower angles of attack. For the test case at the angle of attack of 5.0°, while the lift decreases to only ∼12% of its original value after 600 s of the ice accretion experiment, the drag was found to increase 4.5 times correspondingly. The detailed flow field measurements were correlated with the aerodynamic force data to elucidate the underlying physics.

中文翻译：

---

积冰过程引起风力机叶片模型气动性能退化的实验研究

摘要 对动态积冰过程引起的风力机叶片气动性能退化进行了实验研究。实验研究是在典型的釉面结冰条件下在带有涡轮叶片模型的结冰研究隧道中进行的。在开始积冰实验后，发现冰结构在叶片模型的上下表面上迅速积聚。发现不规则形状的冰结构极大地扰乱了叶片模型周围的气流，导致大规模的流动分离和不稳定的涡结构从积冰表面脱落。发现叶片模型的空气动力学性能显着降低。发现由积冰引起的性能下降是叶片模型攻角的强函数，在较低攻角处性能下降更显着。对于迎角为 5.0°的测试案例，虽然在积冰实验 600 秒后升力下降到其原始值的约 12%，但发现阻力相应增加了 4.5 倍。详细的流场测量与空气动力数据相关联，以阐明潜在的物理学。