Wind turbine blade is the most basic and most critical components, its good design, reliable quality and superior performance is to guarantee the normal and stable operation of the unit deciding factor. The long-term adverse environmental and kept running, the leaves of the request are: the proportion of light and has the best fatigue strength and mechanical properties, able to withstand storms and other extreme conditions and random load tests, leaves the flexibility, when the rotating inertia And the frequency characteristics of both normal and transmitted to the entire power system stability of the load good corrosion resistance, ultraviolet radiation and lightning of good performance; electricity costs are lower, the lowest maintenance costs.
 
According to international consulting firm UtiliPoint president Bob Bellemare said: The wind generator, the carbon fiber is the coming trend. The leaves generally smaller (22 m long) selected a large quantity of cheap E-glass fiber reinforced plastic, resin matrix to unsaturated polyester-based, can also choose vinyl ester or epoxy resin, and larger leaves (such as 42m above) or the general use of CFRP GF CF and the hybrid composite materials, epoxy resin matrix to the main. GE's wind energy project leaves the global manager Ramesh Gopalakrishnan said, designers are looking for high-strength lightweight materials in the process of selection of the carbon fiber used in the design of leaves. Therefore, glass fiber and carbon fiber is manufactured in the leaves of the two most important materials.
 
To meet these requirements, improve the economic unit, leaves the size of wind power increases can improve the economy and reduce costs. Blade length from 1980's 4.5 m development to today's 61.5 m, from the initial capacity of 55 kW to the development of today's 5 MW. In 1970 the wind turbine blades mainly steel, aluminum or made of wood, this choice of materials to E-glass fiber reinforced plastic (GFRP) majority, has begun using carbon fiber composite (CFRP), blade material conforms to the development of Lightweight large leaves and the direction of development.
Bu Mengpi wooden leaves and leaf
Modern micro-, small wind generators have used wooden blades, but the wooden blade of distortions caused not easy. Large and medium-sized wind turbine blades rarely use wood, using the wooden blade is also very good with the strength to do the whole wooden leaves Longitudinal Beam to bear leaves at work by force and must bear the moment.
Steel girder glass fiber skin leaves
Leaves in the modern use of D-type steel pipe or do Longitudinal Beam, do ribbed steel beam, foam filled with glass, a review of the structure of skin, usually in the large-scale wind turbine use. Longitudinal Beam leaves the D-type steel and steel pipe from the root to the tip of the section should gradually become smaller in order to meet the requirements of distorted leaves and reduce the weight of leaves, such as that caused intensity beam.
Such as aluminum extrusion forming long string leaves
Forming aluminum extrusion with the long string, such as leaves easy to manufacture, continuous production, and design requirements can be twisted to distort the process, leaves and roots connect the wheel shaft and flange can be welded or bolted connections to achieve. Light weight aluminum alloy blades, easy processing, but could not be done from the root to the tip of the leaf gradually shrink, because the world has yet to address the extrusion process.
FRP leaves
The so-called GRP (glass fiber reinforced plastic, referred to GFRP) is epoxy resin, unsaturated, such as plastic resin into the different length of glass fiber or carbon fiber reinforced plastics and caused. Reinforced plastic high strength, light weight, anti-aging, can be wrapped around the surface of glass fiber and epoxy resin Tu, filling the rest of the foam. The quality of glass fiber can also surface modification, sizing and coating to be improved. LM glass fiber company is committed to the development of up to 54 m-wide fiberglass blades, the unit kWh lower cost.
Glass composite steel blade
End of the last century, the world's industrialized countries large and medium-sized wind turbine blade products, basically a steel Longitudinal Beam, laminated glass and steel beam rib root of the wheel and connected with metal structure of the composite materials leaves. Wind power generation rotor blades with the material under the leaves of different length and choice of different composite materials, the most widely used in glass fiber reinforced polyester resin, glass fiber-reinforced epoxy resin and carbon fiber-reinforced epoxy resin. U.S. research shows that the use of radio frequency plasma deposition to E-coated glass fiber, its tensile fatigue resistance can be achieved on the level of carbon fiber, and it is this treatment can reduce the damage can in fact lead to the micro-fiber inter-wear . LM glass fiber glass company to further develop steel-based, in the end of the beams and leaves only a small number of optional carbon fiber 61 m large leaves and the development of 5 MW of wind turbine.
Carbon fiber composite blades
With the increase of power generation stand-alone, leaves the length of the increasing demand, in the application of wind power generation will also continue to grow. The leaves of speaking, stiffness is a very important indicator. Research shows that the carbon fiber (carbon fiber, referred to CF) composite steel blade stiffness of the glass is two to three times the leaves. Although the carbon fiber composite material significantly better than the performance of glass fiber composite material, but is expensive, its impact on wind power in the large-scale application. Therefore, the world's major composite companies are from the raw materials, technology, quality control and other areas in-depth study in order to reduce costs.
 
Yesterday, using a wooden or metal materials; Today, we use the glass steel; tomorrow, we use the carbon fiber; tomorrow tomorrow, we will not be used in nano-materials