For wind turbine blades:
The material of wind turbine blades is neither a steel plate nor a plastic. The main material is fiberglass. The connection with the hub is made of steel, in the form of a flange, and is fixed with bolts to the pitch bearing. It is integrated into the main fiberglass material of the blade as an insert, forming an integral part of the blade. .
For industrial draft fans and blowers, they are used in conventional situations and are made of carbon steel plates. They must be corrosion resistant and they are also made of stainless steel plates.
Wind turbine blade size
The wind turbine blade is a thin shell structure made of composite materials. The structure is divided into three parts: root, shell and keel. There are many types, including pointed head, flat head, hook head, pointed head with flaps, andc. The manufacturing process mainly includes male mold → female mold turning → layering → heating and curing → demolding → surface polishing → spray painting, etc. Design challenges include aerodynamic design of blade shape, strength, fatigue, noise design, and composite material layup design. The technical difficulties mainly include mold positive processing, mold recasting and resin system selection. The blade is a large structure made of composite material, and more than 90% of its weight is composed of composite materials, each generator generally has three blades. A single blade of a 1.5 MW generator uses up to 6 tonnes of composite materials, while a wind turbine. Turbine blades over 3 MW use composite materials. The weight of a single unit is more than 10 tones.
The blade diameter is not professional, it should be the sweeping diameter. Common blade shapes are 126/110/114, etc., and the corresponding blade sizes are 68m, 54m and 56m; now the diameter of the largest wind turbine blade has exceeded 70 meters, which is equivalent to the wingspan of a Boeing; aircraft.
When it comes to materials, it's more complicated. Different parts of the blade have different materials. Generally speaking, three categories are used, carbon fiber and fiberglass as the exterior surface, and balsa wood and foam as the surface. base material.
The other thing is that carbon fiber binder is ideal because it has better strength and is lighter, but it is also a problem because it is too expensive. Balsa wood is balsa wood. As for foam, there are relatively many types, but generally they are foam products from there which represent 90% of the share in this area.
The main materials of wind turbine blades are fiberglass fabrics and reinforced resins.
Large megawatt blade spar caps can use a carbon-glass hybrid design, and hull cores typically use glass. . Fiber fabric
In addition to LM, domestic and foreign large wind turbine blade manufacturers such as VESTAS, SIEMENS, GAMESA, etc. all use epoxy resin systems; resin and fiberglass fabric, using polyester resin, the bonding speed is fast, the post-curing process does not require heating, and the mold rotation efficiency is high;