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Zhang L.,Inner Mongolia University of Technology | Zhang L.,Inner Mongolia Key Laboratory of Reproducible Energy | Wang J.,Inner Mongolia University of Technology | Wang J.,Inner Mongolia Key Laboratory of Reproducible Energy | And 5 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2011

The flow fields at meridional plane of the rotating horizontal axis wind turbine (HAWT) under different tip speed ratios were measured by using the linear correlation particle image velocimetry (PIV) system and axis-coder positioning period sampling technology. The instantaneous velocity field and relevant time mean velocity field were obtained; key analysis was done about the inducible effect region of tip vortex. The experimental investigations showed that the external steady main field, the inducible effect region of tip vortex and the central wake region are distinguished in the rotor downstream wake clearly. The HAWT wake structure contour is the tapeleptospira. The vortex core diameter is increasing with axial distance adding. With the test azimuth increasing, the tip vortex which is generated by each blade in the wake flows to the downstream spread orderly along the spiral cone-shaped profile. With the tip speed ratio increasing, the axial velocity deficit of the internal central wake region is increasing gradually, moreover, the range of the central wake region is widening gradually. Source

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