6 MW大厚度钝尾缘风电叶片结构分析

Structure Analysis of 6 MW Wind Turbine Blade With Large Thickness and Blunt Trailing Edge

基于我国对低载轻质高强度风电叶片的需求,本文在荷兰DOWEC叶片的基础上,设计了一种6MW大厚度钝尾缘叶片,并基于FOCUS对其结构特性进行了分析。通过控制前后两叶片铺层参数不变,研究了大厚度钝尾缘外形对叶片载荷与结构的影响,得出提高叶片内侧翼型的相对厚度可以降低其质量与轴向载荷。通过控制叶片外形不变而修改铺层参数,研究了大厚度钝尾缘外形的铺层特性,得出梁帽厚度是影响该叶片结构强度的最主要铺层参数。最后,基于上述结论改进了大厚度钝尾缘叶片的铺层设计,并进行了全面的结构特性评估。结果表明与DOWEC叶片相比该叶片实现了载荷降低,质量减轻,结构增强。

Since the demand of the wind turbine blade with low load,light quality and high strength in China,the 6 MW wind turbine blade with large thickness and blunt trailing edge was designed base on the DOWEC blade in Netherlands,and its structure characteristic was analyzed by FOCUS.The effect of large thickness and blunt trailing edge on load and structure was analyzed through keeping the two blades layers constant,the result shows that thickening the relative thickness of inboard blade can contribute to reducing the weight and axial load.The blade layers feature of large thickness and blunt trailing edge was analyzed through keeping the blade shape constant while changing the blade layers.The result shows that the thickness of girder was the dominant parameter to affect the blade strength.Finally,base on the above results the layers of the blade with large thickness and blunt trailing edge was improved,and through comprehensive structure analysis,the result shows that the new blade has lower load,lighter quality and higher strength than the DOWEC blade.