Xiang Gao, Jun Hu, and Zhiqiang Wang
PIV, CFD, HAWT, velocity vector distribution
A three-dimensional horizontal axis wind turbine model was experimentally and numerically studied. The experiment was carried out in a laboratory wind tunnel. With PIV measurement, details about flow fields around the blade in varied rotating speed and wind speed were obtained. Furthermore, the experimental result was compared with CFD simulation in order to study the flow fields in more detail, especially the graphs of the velocity vector under different operating conditions. When λ≥7.4, the test torques and CP accord well with the calculated values; When λ<7.4, both are lower than that numerical results. The distributions of velocity vector of several sections at different radial positions are acquired through PIV technique. When λ=4, there are obvious flow separations on sections S1 and S2, which locate closer to the root of the blade; however only section S1 has separate field through calculation. When λ=9.8, neither PIV nor CFD result shows there is any separated flow around the blade.
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