Sections 1 through 3 explain and evaluate the results of our exploration mentioned in the title, which we believe are of some use to designers. The core of sections 1 and 2 consists of; (1) the laminate model of the finite element analysis software ANSYS is employed to analyse static strength of a wind turbine blade under aerodynamic, centrifugal and gravity forces; (2 ) self-developed Fortran program has been applied to compute the aerodynamic force based on the momentum and blade element theory. Simulation results, presented in Tables 1 and 2 and Figs. 2 through 7 show preliminarily that: (1) aerodynamic force has the greatest effect on the strength of the blade, while centrifugal force and gravity can be ignored; (2) numerical tests concerning layer direction show that the best direction of fiber is along radial direction and the worst is along circumferential direction; (3 ) the combination of different layer direction and thickness variation analyses shows that fiber along radial direction with slight cross is better than without cross; (4) the best layer design scheme, obtained through varying the composite material of blade from root to tip gradually from solid to 5mm and then to 3 mm thickness, can obtain the minimum deflection and stress.%文章采用有限元方法层合板模型分析风力机叶片在气动力、离心力和重力载荷下的静强度,气动力由动量-叶素理论获得并采用接触对加载,结果袁明气动力是影响叶片强度的主要载荷,其次是离心力和重力,后二者可忽略；铺层方向测试表明:纤维沿展向铺层最佳,沿切向最差；铺层方向组合和变厚度叶片分析表明:铺层沿展向略微交错强度高于不交错；8个铺层方案对比获得最佳方案为从根部到梢部依次采用实心、5mm和3mm铺层,最小变形和应力接近极限情况.
展开▼
