Generation and decay of counter-rotating vortices downstream of yawed wind turbines in the atmospheric boundary layer
Generation and decay of counter-rotating vortices downstream of yawed wind turbines in the atmospheric boundary layer
复制标题
偏航风力发电机下游大气边界层反向旋转涡流的产生和衰减
DOI:
10.1017/jfm.2020.717
复制
发表时间:
2020
影响因子:
3.7
通讯作者:
Meneveau, Charles
中科院分区:
文献类型:
--
作者:
Shapiro, Carl R.;Gayme, Dennice F.;Meneveau, Charles
A quantitative understanding of the dominant mechanisms that govern the generation and decay of the counter-rotating vortex pair (CVP) produced by yawed wind turbines is needed to fully realize the potential of yawing for wind farm power maximization and regulation. Observations from large eddy simulations (LES) of yawed wind turbines in the turbulent atmospheric boundary layer and concepts from the aircraft trailing vortex literature inform a model for the shed vorticity and circulation. The model is formed through analytical integration of simplified forms of the vorticity transport equation. Based on an eddy viscosity approach, it uses the boundary-layer friction velocity as the velocity scale and the width of the vorticity distribution itself as the length scale. As with the widely used Jensen model for wake deficit evolution in wind farms, our analytical expressions do not require costly numerical integration of differential equations. The predicted downstream decay of maximum vorticity and total circulation agree well with LES results. We also show that the vorticity length scale grows linearly with downstream distance and find several power laws for the decay of maximum vorticity. These results support the notion that the decay of the CVP is dominated by gradual cancellation of the vorticity at the line of symmetry of the wake through cross-diffusion.
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影响因子:
3.7
作者:
H. Zong;F. Porté
通讯作者:
F. Porté
DOI:
--
发表时间:
1995
期刊:
影响因子:
--
作者:
L. V. Dommelen;S. Shankar
通讯作者:
S. Shankar
DOI:
--
发表时间:
2020
期刊:
Journal of Physics: Conference Series
影响因子:
--
作者:
L. Martínez‐Tossas;E. Branlard
通讯作者:
E. Branlard
影响因子:
1.9
作者:
Meneveau, Charles
通讯作者:
Meneveau, Charles
DOI:
--
发表时间:
1993
期刊:
影响因子:
--
作者:
S. Ohring;H. Lugt
通讯作者:
H. Lugt