<p class="MsoNoSpacing" style="text-align: justify; line-height: 115%">Currently, wind farms are being installed in many countries to meet the enormous energy demand. For optimum wind farm efficiency, it is required to have an in-depth knowledge of turbine wake characteristics. This article presents an experimental investigation of wake expansion process defined by the transition of wake from near to far wake regimes. The study has been performed on three models of horizontal axis wind turbine (HAWT) composed of NACA 0012 profile. The models are fabricated keeping the ratio of root chord to tip chord as 1:1, 5:3, and 5:2. In each case, the downstream fluctuating field of the rotor is examined in a low-speed wind tunnel by a constant temperature x-probe hot-wire anemometry (HWA). The time-averaged velocity deficits and vortex shedding frequencies are evaluated to characterize the downstream flow fields. The investigation demonstrates the low frequency (&lt;100 Hz) dominance within 6R downstream of the rotor plane (R being the rotor radius), beyond which the unsteady frequency response is detected. The time-averaged wake deficit measurement suggests a drop in the upstream velocity by 80% at 0.5R and 40% at 3R, indicating the initiation of flow recovery from near wake regime. The present study on wind turbine wake characteristics shall have great implications in enhancing the wind farm wake modeling.</p>

Characterizing the Transitional Behavior of Wind Turbine Wake From Near to Far Wake Regimes

Paper Proceedings: https://asmedigitalcollection.asme.org/POWER/POWER2021/volume/85109

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