Abstract
The wind turbine with a flanged-diffuser shroud—so called “wind-lens turbine”—is developed as one of high performance wind turbines by Ohya et al. In this paper, the wind turbine performance is investigated for both steady and unsteady winds. The compact-type wind lens turbine shows higher efficiency than the only rotor wind turbine. Also, the flow structure around the compact-type wind turbine is made clear by CFD and PIV in steady wind. Furthermore, the performances of the only rotor and the compact-type wind-lens turbines for unsteady wind are experimentally and numerically investigated. Experimental and numerical results are presented to demonstrate the dependence of frequency of the harmonic oscillating velocity wind on power coefficient. Consequently, the compact-type wind-lens turbine show better performance than the only rotor one in sinusoidally oscillating velocity wind. Furthermore, the numerical estimation can predict the power coefficient in the oscillating flows to an accuracy of 94% to 102%. In addition, the dependence of the turbine performance on turbulent intensity and vortex scale of natural fluctuating wind is presented.
Highlights
It is important issue that a wind power generation is improved to raise the efficiency as one of natural energy sources in order to promote the usage of sustainable energy
We examine the effect of the main factors of the natural wind on power coefficients of the only rotor and the compact-type wind turbines for mean wind velocity 5 m/s
This paper presented wind performances of the only rotor turbine and flanged diffuser shroud which are so called “the compact-type wind-lens turbine” in steady and unsteady winds
Summary
It is important issue that a wind power generation is improved to raise the efficiency as one of natural energy sources in order to promote the usage of sustainable energy. The wind-lens turbine can generate electric power even in low velocity wind since the flanged-diffuser shroud increases the wind velocity at rotor. Research subjects of wind turbines in unsteady flows become important, which are the effects of fluctuating wind velocity and flow direction, non-uniform inflow, turbulence and other factors. They influence the performance and fatigue problem. The performances of the ordinary rotor wind turbine and the compact-type wind-lens turbine in harmonic oscillating velocity wind are experimentally and numerically investigated. The effects of the turbulent intensity and vortex scale in natural fluctuating velocity wind on the turbines performance are studied
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