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Aerodynamic performance evaluation of the offshore deflector integrated cross axis wind turbine
  • Sam Saham,
  • Saber Rezaey
Sam Saham
Tarbiat Modares University

Corresponding Author:[email protected]

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Saber Rezaey
Tarbiat Modares University
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Abstract

Through the integration of numerical and analytical methods, the performance of an offshore cross-axis wind turbine (CAWT) with a flow deflector has been examined in this work. The deflector’s geometry is created in a way that it can redirect flow in all directions. This deflector causes the flow to exit vertically, where it collides with the wind turbine’s horizontal axis (HAWT). On the other hand, the blades of a vertical axis wind turbine (VAWT) harness the power of horizontal wind flow. The total power absorbed by HAWT and VAWT blades will represent the power of CAWT. In the current study, firstly, the speed of the outflow from the deflector was determined using numerical simulation. The numerical simulation output was utilized as an input for the turbine’s performance analysis, which was performed using the analytical methods double-multiple streamtube theory (DMST) and blade element momentum theory (BEMT). In fact, the aforementioned process establishes an offline coupling between analytical and numerical approaches. The results of this study show that an offshore CAWT with a deflector can produce power equal to 83 W and a power coefficient of 0.35 at a wind speed of 8 m/s. This amount of power and efficiency is approximately 48% and 45% greater than a single VAWT, respectively.