Transactions of Nanjing University of Aeronautics & Astronautics
Special Issue for Wind Turbine
Numerical simulations of wake characteristics of a wind turbine in uniform inflow
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Abstract:
A 2-blade HAWT model is simulated at various tip speed ratios to study its wake characteristics by analyzing the tip and root vortex trajectory in near-wake, and the vertical profiles of axial velocity. The results show the pitch of the tip vortices varies inversely with the tip-speed-ratio. Diametric expansion of tip vortices becomes more obvious as the tip-speed-ratio increases. Tip vortices shed from the blade in the range of 97.5%-99.7% radius of the rotor. The axial velocity profiles transform from W-shaped to V-shaped at the distance downstream of eight rotor diameters due to momentum recovery.
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