![]() ![]() So which is the best blade shape and design for a wind turbine blade design. Then the optimal tip speed ratio, TSR, which is defined as the ratio of the speed of the rotor tip to the wind speed, depends on the rotor blade shape profile, the number of turbine blades, and the wind turbine propeller blade design itself. On the other hand, if the propeller blade rotates too quickly, it appears to the wind as a large flat rotating disc, which creates a large amount of drag. If the turbines propeller blades rotate too slowly, it allows too much wind to pass through undisturbed, and thus does not extract as much energy as it potentially could. The trick here is to design the rotor blade in such a way as to create the right amount of rotor blade lift and thrust producing optimum deceleration of the air and therefore better blade efficiency. The net result is a lifting force perpendicular to the direction of flow of the air over the turbines blade. The side with the most curve generates low air pressure while high pressure air beneath pushes on the other side of the blade shaped aerofoil. Just like an aeroplane wing, wind turbine blades work by generating lift due to their curved shape. The forces which decelerate the wind are equal and opposite to the thrust type lifting forces which rotates the blades. This is achieved by extracting the energy from the wind by slowing it down or decelerating the wind as it passes over the blades. ![]()
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