Evolution Law of Coupling Evolvement Mechanism of Vortex Field Induced by Typical Hilly Terrain and Wind Turbine

doi:10.3901/JME.2020.04.085

Abstract

Abstract: The aerodynamics field of wind farm is generated and evolved in the form of vortex. Large eddy simulation(LES) method, which can provide evolution characteristics of vortex, is used to simulate the vortex structure of typical hilly terrain. The accuracy of the simulation results of kinetic energy transport(KET) model is verified through wind tunnel test data, and the influence of different inflow wind speeds on the instantaneous characteristics of wind field of hilly terrain is discussed. Subsequently, the temporal and spatial evolution mechanism of the coupling between terrain-induced vortex and wind turbine wake vortex is explored. It is found that the coupling evolution mechanism of the wake vortex structure of single wind turbine and two parallel wind turbines is different. The mechanism of single wind turbine is due to the formation of secondary vortex and its coupling with wake vortex, while the two parallel wind turbines are due to the coupling of secondary vortex and wake vortex and the joint effect of vortex coupling between the two units. The research on evolution of vortex in complex terrain can provide reference for planning design and operation of wind farms.

Key words: actuator disk, vortex coupling, large eddy simulation (LES), numerical simulation

CLC Number:

TK89

SHI Junjie, XU Chang, LEI Jiao, LI Linmin, XUE Feifei, HAN Xingxing. Evolution Law of Coupling Evolvement Mechanism of Vortex Field Induced by Typical Hilly Terrain and Wind Turbine[J]. Journal of Mechanical Engineering, 2020, 56(4): 85-94.

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