Solar power generation blade molding

Can a wind turbine be operated by rotational molding?

This study concerns the wind tunnel tests and the characterization of the operation of a wind turbine 1750 mm in diameter, equipped with two straight blades manufactured by rotational molding. The performance of the wind turbine is studied at different blade pitch angles 3°, 6°, 9°, and 12°.

What is the power coefficient of a rotational molded wind turbine?

Indeed, its power coefficient Cp is close to 0.5 for a blade pitch angle of 3 to 12°. It should be remembered that the maximum theoretical yield defined by Betz’s law is Cp = 0.59. The work carried out makes it possible to demonstrate the feasibility of producing small wind turbines with rotationally molded blades.

How can a lightweight blade be manufactured?

That, a lightweight blade can be manufactured along with increasing the mechanical properties which is an important criterion for fabrication the blades. In addition, different polymer materials, including thermosets (various formulations of polyurethanes) and polyethylene, have been inquired.

What are the conditions for rotational molding?

The rotational molding conditions are 5 min at room temperature, 10 min at 80 °C, then 15 min of cooling for demolding at around 35–40 °C. In order to achieve optimal mechanical performance, the blades were foamed. For each type of PU and PE body, two different foams of PU and PE were applied.

How are rotor blades made?

To do this, huge molds are built in which glass or carbon-fiber materials are manually placed and impregnated with resin to create spar caps and blades. The composite material hardens under vacuum to form a blade half, is stiffened using stays, and paired up with the second half to form the complete rotor blade.

What is rotational molding?

Rotational molding, also referred to as rotomolding, is a versatile technique for manufacturing hollow parts with varying sizes and complexities, eliminating the need for additional welding or assembly .