|
|
|
| Influence of dynamic wind direction on evolution law of wind turbine wake |
| GUO Tao1, LI Ye1*, LI Deshun1,2,3, HAN Wei1,3, LI Rennian1,2,3 |
| 1. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Gansu Provincial Technology Centre for Wind Turbines, Lanzhou, Gansu 730050, China; 3. Key Laboratory of Fluid Machinery and Systems, Lanzhou, Gansu 730050, China |
|
|
|
| Guide |
|
|
Abstract In order to study the influence of dynamic wind direction on the wake evolution of horizontal axis wind turbines, large eddy simulation(LES)coupled with the actuation line model(ALM)method based on the OpenFOAM software platform was used to analyze the impact of dynamic wind direction amplitude changes on wake velocity characteristics, turbulence characteristics and meandering characteristics. The research results show that with the change of dynamic angle amplitude, the diffe-rence in the wake velocity mainly reflects after 4D(where D is the diameter of the wind wheel), and as the angle amplitude increases, the recovery of the average wake velocity becomes more and more quick. Under dynamic wind direction conditions, the blade tip vortex oscillates, and as the dynamic wind direction angle amplitude increases, the oscillation amplitude becomes larger and larger. As the angle amplitude increases, the dynamic change of the wind direction angle intensifies the meandering of the wake which increases the maximum offset of the wake center, the growth conforms to the law of a quadratic power function, and the growth rate of the far wake is much greater than that of the near wake. When the dynamic angle change amplitude reaches 15°, the wake center offset at 10D reaches 48.62%. The increase in the amplitude of dynamic wind direction angle changes will change the wake boundary, resulting in the expansion of the wake's influence range.
|
|
Received: 02 March 2022
|
| Fund: |
|
|
|
|
|
|
