【作者】 潘旭；

【导师】 李成；

【作者基本信息】 郑州大学 ， 车辆工程， 2011， 硕士

【摘要】 风轮是风力发电机的主要部件之一,其力学特性和气动效率的好坏与风力发电机的性能有着密切的关系。本文主要以某一MW级水平轴风轮叶片为研究对象,运用Ansys与CFX基于Ansys Workbench软件平台对其进行流固耦合数值模拟,并分析在其过程中叶片的变形及应力变化情况。通过离散风轮叶根安装角范围来计算风轮的输出转矩,在叶根安装角范围内转矩输出的最大值,对应最佳叶根安装角。基于最佳叶根安装角对不同叶厚工况进行了流固耦合数值分析；替换叶片材料为复合材料并进行了流固耦合数值模拟；最后将流固耦合技术应用于轴流泵叶片的强度分析。结果显示,叶根最佳安装角为13度；不同叶厚工况均在叶片压力面靠近中部位置出现应力集中,容易引起疲劳断裂；叶尖变形较大,容易引起叶片挥舞；通过改变复合材料铺层可改善叶片的综合力学性能,实现风轮叶片的优化设计；轴流泵叶片最大应力的增长远大于泵轮转速的增长速度,叶片危险截面位于叶片根部,应力集中主要在叶片外表面。更多还原

【Abstract】 Wind turbine is one of the main components of wind driven generator, the mechanical properties and aerodynamic efficiency of which have a close relationship with the performance of wind driven generator. A certain MW grade horizontal axis wind turbine blade was used as the main research model, the paper simulated its fluid solid interaction field by ANSYS and CFX based on ANSYS Workbench software platform and analyzed changes of blade deformation and stresses on the blade.The output torque of wind turbine was calculated under discrete range of pitch angle of blade root, which showed the only one maximum torque corresponded to the optimum pitch angle of blade root. Blades of different thickness were analyzed by fluid solid interaction simulation in conditions of the optimum pitch angle of blade root. Blade of composite material was analyzed by fluid solid interaction simulation. At the end, the paper analyzed the strength of an axis flow pump impeller based on fluid solid interaction technology.The result showed that optimum pitch angle of blade root is 13 degree. The stress concentrations of blades of different thickness all appeared at the middle of the blade side under compressive stress, which can easily lead to fatigue failure. And the blade tip had a quite large deformation which could cause the blade waving. The optimization design of wind turbine can be done through improving the comprehensive mechanics properties by changing the layers of composite material. The stress concentration of axial flow pump impeller occurred at the surface and the dangerous place of blade is at the root of joint. The growth rate of the maximum stress of impeller is higher than that of the rotate speed of axial flow pump.更多还原