Abstract
The wake of upstream wind turbine is known to affect the operation of downstream turbines and the overall efficiency of the wind farm. Wind tunnel experiments provide relevant information for understanding and modeling the wake and its dependency on the turbine operating conditions. There are always two main driving modes to operate turbines in a wake experiment: (1) the turbine rotor is driven and controlled by a motor, defined active driving mode; (2) the rotor is driven by the incoming wind and subject to a drag torque, defined passive driving mode. The effect of the varying driving mode on the turbine wake is explored in this study. The mean wake velocities, turbulence intensities, skewness and kurtosis of the velocity time-series estimated from hot-wire anemometry data, were obtained at various downstream locations, in a uniform incoming flow wind tunnel and in an atmospheric boundary layer wind tunnel. The results show that there is not a significant difference in the mean wake velocity between these two driving modes. An acceptable agreement is observed in the comparison of wake turbulence intensity and higher-order statistics in the two wind tunnels.
| Original language | English (US) |
|---|---|
| Article number | 1915 |
| Journal | Energies |
| Volume | 13 |
| Issue number | 8 |
| DOIs | |
| State | Published - Apr 1 2020 |
Bibliographical note
Funding Information:Funding: The work was supported by the National Natural Science Foundation of China (No. 51575296 and No. 51875305), the China Scholarship Council (201706210200), the Institute on the Environment (IonE), and the National Science Foundation (Grant: 1351303, PI: M. Guala).
Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Keywords
- Driving mode
- Turbulence intensity
- Wake effect
- Wind tunnel experiment
- Wind turbine
