Approaching Lightest Weight of a Wind Turbine Blade
As the capacity of a wind power generator gets higher and higher,to reduce the weight of a wind turbine blade becomes the most critical issue.Although the skin and main girder structures of a current blade are already reached or near to their optimal,the resulting edgewise stiffness of the blade is still generally too much greater than necessary compared with its flapwise counterpart.In this report,the end segment of a blade is divided into trapezoidal blocks,the number of which is equal to that of the end connectors.The blocks which contribute more to the flapwise than to the edgewise stiffness will be fabricated using unidirectional fiber fabric reinforced polymer composites,and are called UD blocks.Otherwise,they can be made from foam core material except for a limited portion adjacent to the blade end where a UD block is applied to fix a T-bolt nut.In this way and allowing about 40%of the extra edgewise stiffness of a blade by a current design is released,the blade weight can be reduced by more than 14%.This is most probably the last innovative technology with which more than 10%beneficial contribution to en existing blade(e.g.,to increase more than 10%efficiency or to save more than 1 0%weight or cost of the blade)can be made without any variation in the material system and processing technique used.In other words,after the technology proposed in this paper is effectively employed it is hardly able to develop another one in the ever future which,while keeping the blade material system and processing technique unchanged,can still achieve more than 10%benefit to the thus obtained blade.
Wind turbine blades End connection Structural design Lightest weight
Huang Zheng-Ming Bai Mo
School of Aerospace Engineering & Applied Mechanics,Tongji University 1239 Siping Road,Shanghai 200092,P.R.China
国际会议
The 13th World Wind Energy Conference(WWEC2014)(第十三届世界风能大会)
上海
英文
1-7
2014-04-17（万方平台首次上网日期，不代表论文的发表时间）