Comparative Study of Dynamic Stall under Pitch Oscillation and Oscillating Freestream on Wind Turbine Airfoil and Blade
Abstract
:1. Introductions
- Thirdly, a periodic AOA change (i.e., oscillating freestream, OF) results from the superposition of rotational velocity and the in-plane freestream velocity component (Figure 1e) under yawed inflow; as a counterpart, pitch oscillation (PO) occurs and affects the effective AOA under blade pitching or elastic bending (Figure 1f).
2. Methodology
2.1. Thin-Airfoil Theoretical Analysis
2.2. Numerical Modeling
2.3. Beddoes-Leishman Semi-Empirical Model
2.3.1. Unsteady Attached Flow
2.3.2. Unsteady Separated Flow
2.3.3. Vortex Force
3. Results and Discussion
3.1. Time-Varying Sectional Incident Velocity under Yawed Inflow
3.2. Validations of Numerical Modeling Methods
3.3. Equivalence Analysis between Pitch Oscillation and Oscillating Freestream
3.4. Comparison of Dynamic Stall in Yawed Condition between the Two Motions
3.5. Effect of Rotational Augmentation on the Dynamic Stall of the Inboard Blade
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
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Zhu, C.; Wang, T. Comparative Study of Dynamic Stall under Pitch Oscillation and Oscillating Freestream on Wind Turbine Airfoil and Blade. Appl. Sci. 2018, 8, 1242. https://doi.org/10.3390/app8081242
Zhu C, Wang T. Comparative Study of Dynamic Stall under Pitch Oscillation and Oscillating Freestream on Wind Turbine Airfoil and Blade. Applied Sciences. 2018; 8(8):1242. https://doi.org/10.3390/app8081242
Chicago/Turabian StyleZhu, Chengyong, and Tongguang Wang. 2018. "Comparative Study of Dynamic Stall under Pitch Oscillation and Oscillating Freestream on Wind Turbine Airfoil and Blade" Applied Sciences 8, no. 8: 1242. https://doi.org/10.3390/app8081242