It is understood that as the power of the single unit of power generation increases, the length of the blade is required to increase. For the blade, stiffness is also a very important indicator. Related studies beginning at the end of the last century show that carbon fiber composites have outstanding fatigue resistance. When mixed with resin materials, they become one of the best materials for wind turbines to adapt to harsh weather conditions. The stiffness of carbon fiber composite blades is FRP composite. Two to three times the blade. Ramesh Gopalakrishnan, GE's global manager of blade engineering, said that designers were looking for carbon fiber when looking for lightweight, high-strength materials.
Although the performance of carbon fiber composites is much better than that of glass fiber composites, it is expensive, 10 times that of glass fiber. The low cost performance affects its wide application in wind power generation. Therefore, the world's major composite materials companies are in-depth research from raw materials, process technology, quality control and other aspects in order to reduce costs. VESTAS's V-90 wind turbine has a capacity of 3.0 MW and a blade length of 44 m. Its sample test is made of carbon fiber; GAMESA contains carbon fiber in the manufacture of blades with a diameter of 87 m and 90 m; NEG Micon is manufacturing carbon fiber reinforcement. 40 m blade of epoxy resin; the carbon fibers of all three companies are sourced from St. Louis-based Zoltek. German blade manufacturer Nordex Rotor has developed 56m long carbon fiber blades. They believe that carbon fiber blades are not more expensive than glass fibers when they exceed a certain size.
In the report of the 2004 Global Carbon Fiber Outlook, LM pointed out that carbon fiber should be used in wind turbine blades, and attention should be paid to the added weight when it is mixed with glass fiber. The reliability of sample testing when applied to blade design is not high enough. The coverage of the large test; the processing accuracy is high; because it is a semi-conductive material, it is necessary to avoid damage to the blade caused by lightning. At present, the 2.5-3.5MW units installed on a large scale use lightweight, high-performance fiberglass blades, which are reliable in design and competitive in the market. The design of the next-generation 5-10MW wind turbine will use more carbon fiber.
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