Wind power is one of the important renewable energy sources. Currently, many\nresearches are focusing on improving the aerodynamic performance of wind turbine blades\nthrough simulations and wind tunnel testing. In the present study, the aerodynamic\nperformance of the perforated Eqwin blade (shell type blade) is investigated by using\nnumerical simulation. Three types of slots namely circular, horizontal rectangular and vertical\nrectangular were evaluated. It was found that the optimum angle of attack for a perforated shell\ntype blade was 12�º with maximum Cl/Cd value of 6.420. In general, for all the perforated blade\ncases, Cl/Cd tended to decrease as the slot size increased except for the circular slot with 5 mm\ndiameter. This was due to the disturbance of the airflow in lower side region which passed\nthrough the bigger slot size. Among the modified slots; the circular slot with diameter of 5 mm\nwould be the best slot configuration that can be considered for blade fabrication. The Cl/Cd\nobtained was 6.46 which is about 5% more than the value of the reference blade. Moreover, the\nintroduced slot would also reduce the overall weight of the blade by 1.3%.
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