Abstract
The dynamic yaw motion of the wind turbine will affect the overall aerodynamic performance of the impeller and the corresponding wake flow, but the current research on this issue is inadequate. Thus, it is very necessary to study the complicated near-wake aerodynamic behaviors during the yaw process and the closely related blade aerodynamic characteristics. This work utilized the multi-relaxation time lattice Boltzmann (MRT-LBM) model to investigate the integral aerodynamic performance characteristics of the specified impeller and the dynamic changes in the near wake under a sine yawing process, in which the normalized result is adopted to facilitate data comparison and understanding. Moreover, considering the complexity of the wake flows, the large eddy simulation (LES) and wall-adapting local eddy-viscosity (WALE) model are also used in this investigation. The related results indicate that the degree of stability of tip spiral wake in the dynamic yaw condition is inversely related to the absolute value of the change rate of yaw angular speed. When the wind turbine returns to the position with the yaw angle of 0 (deg) around, the linearized migration of tip vortex is changed, and the speed loss in the wake center is reduced at about the normalized velocity of 0.27, and another transverse expansion appeared. The directional inducing downstream of the impeller sweep surface for tip vortex is clearly reflected on the entering side and the exiting side. Additionally, the features of the static pressure on the blade surface and the overall aerodynamic effects of the impeller are also discussed, respectively.
Highlights
In the atmospheric environment, wind has a strong random uncertainty, especially in complex terrain areas and urban high-rise residential blocks, there may be complex flow scenarios such as shear wind, side wind, gusts, etc
11a–g with the sine change of ilar changing to Figure the yaw angle, in which there is obvious tip vortex distribution entering side, and According to the above calculation results as in Figure 10,on thethe main change characfew on the exiting side, especially for the deflection angles with the largest absolute value, teristics of the wake of the wind turbine are shown in the near-wake area; the such as Figure
The research on the complex wake of horizontal-axis wind turbines during the dynamic yaw process is currently scarce, and for this reason, we performed an unsteady computational fluid dynamics simulation using the multi-relaxation time lattice Boltzmann (MRT-LBM) method to investigate the dynamic changes of the near wake of wind turbine impeller under a yawing case
Summary
Wind has a strong random uncertainty, especially in complex terrain areas and urban high-rise residential blocks, there may be complex flow scenarios such as shear wind, side wind, gusts, etc. For early and current including experimental measurements, tionnumerical against the continuous dynamicanalysis, yawingit of windthat impeller based the of multi-rel calculations, and theoretical is shown the changes in on a series wake flow characteristics caused by wind turbine yaw motion are mainly concentrated in tion time lattice Boltzmann method (MRT-LBM) is performed to investigate the dyna static yaw angle conditions, and especially for the studies of wake vortices, parameters changes of the 3D wake vortex system of a full wind turbine model. A Brief Description of the LBM-LES Methodology one of the simple linear collision operators
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