The materials used for processing the leaves are wood, metal, engineering plastics, glass fiber reinforced plastic and so on.
1. Wooden leaf and cloth skin leaf
Modern micro, small wind turbines also use wooden blades, but wooden blades are not easy to make a twisted type. Large and medium-sized wind turbines rarely use wooden blades, the use of wooden blades is also with good strength of the whole wooden blade longeron to bear the blade in the work must bear the force and bending moment.
2, steel beam glass fiber skin blade
In modern times, the blade is made of steel pipe or D-type steel as a longitudinal beam, steel plate as a rib beam, filled with foam plastic and covered with glass fiber reinforced plastic skin, which is generally used on large wind turbines. The cross section of steel pipe and D-type steel from blade root to blade tip should be gradually reduced to meet the requirements of twisted blade and reduce blade weight, that is, to make equal strength beam.
3, aluminum alloy and other chord length extrusion molding blade
The blade of equal chord length extruded by aluminum alloy is easy to manufacture, can be associated with production, and can be twisted according to the design requirements. The shaft and flange connected with the blade root and the hub can be realized by welding or bolt connection. Aluminum alloy blades are light in weight and easy to work, but they cannot shrink from the root to the tip of the blade because the world has not yet solved this extrusion process. In addition, the oxidation and aging of aluminum alloy in air are also worth studying.
Post time: Oct-31-2022
