Abstract
Gyromill wind turbines with two different blade profiles were investigated experimentally and numerically in order to verify the effect of the negative camber on aerodynamic performance. Experiments were carried out using a model turbine impeller with an axial length of 200 mm and a diameter of 200 mm. The performance of the model wind turbines with two blades were measured with a wind tunnel in a wind velocity of constant 4 m/s. The results showed that the maximum power coefficient was higher for the blade with negative camber by 5.0 percentage points than the one without camber. An unsteady numerical flow analysis around the wind turbine was then conducted using a commercial code employing the finite volume method. The results showed that the power coefficient of one blade had a maximum value in the second quadrant for the two tested wind turbines. The results also showed that the blades with negative camber were advantageous for obtaining high rotational torque in the position by examination of the pressure distribution on the blade.
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