| Summary: | All wind-driven generators need to be equipped with brakes to ensure
operational control and safety. Many methods are available to avoid
over-speed of the blower. This paper establishes a mechanics model to
investigate each point on turbine blades, which are such designed that they
would change shape in high winds to reduce the frontal area through adaptive
and flexible deformation. In this way, high wind speeds will cause
deformation of the blades and decrease of the rotational speed, as a result
the turbine slows down. A numerical analysis of the fluid in the fan housing
and a force analysis of the blades are performed, and numerical results are
used to design the non-uniform arrangement of the hybrid glass/carbon fiber.
A wind tunnel experiment is performed on the new blade design. The
experimental results show that the new blade achieves an improvement in its
mechanical properties and is able to adaptively adjust the torque. During
the operation of the wind-driven generator, the new blade could effectively
broaden the operational range of wind speeds, thereby improving the power
generation when the wind speed is low. A generator without a brake stalls
when the wind speed exceeds 13 m/s. After the adoption of the self-adaptive
blade made up of the uniform-section complex textile material, the power set
shows reduction of noise, avoidance of blade runaway, improvement of the
efficiency of the power generation, decrease of cost and enhancement of
blade consistency.
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