适用于西藏地区的聚风型垂直轴风力机结构特性分析

为满足西藏高寒高海拔地区对风力机安全可靠性的需求,以部件强度和气象参数为约束条件,针对一台面向西藏地区的额定功率为500 W的聚风型直线翼垂直轴风力机进行结构分析,并采用有限元分析方法,对风力机主要部件进行了静力学分析和模态分析.静力学分析表明:在额定转速下风力机叶片、主轴、支撑臂、法兰盘、上下聚风罩和塔筒等主要结构部件的最大位移形变分别为0.19, 0.25, 0.013, 0.005 6, 0.63, 1.20, 0.05 mm;最大承受应力分别为11.96, 25.63, 11.70, 6.10, 4.68, 2.11, 2.28 MPa,均在材料所能承受的范围之内,风力机主要结构部件设计合理,满足设计要求.模态分析表明:风轮的工作频率2.50 Hz远小于其一阶固有频率9.22 Hz,不会发生共振,安全可靠.研究结果可为垂直轴风力机的结构设计与分析提供参考,为聚风型直线翼垂直轴风力机在高寒高海拔地区应用提供基础.

Analysis of structural characteristics of vertical axis wind turbine with wind gathering device in Tibet

In order to meet the demand of safety and reliability of the Vertical Axis Wind Turbine(VAWT)with wind gathering device in the high-cold and high-altitude regions of Tibet,based on the constraint conditions of component strength and meteorological parameters,a kind of 500 W power ra-tings SB-VAWT with wind gathering device in Tibet was used for structural analysis.The finite element method was used to calculate and analyze the static mechanical characteristics and modal of main parts of VAWT.The static structural analysis by ANSYS showed that the maximum displacement and defor-mation variation under the rated speed condition of the main structural components such as blade,beam,main axis,flange plate,upper and lower wind gathering device and tower were 0.19,0.25,0.013,0.0056,0.63,1.20,0.05 mm respectively.The maximum equivalent stress were 11.96,25.63,11.70,6.10,4.68,2.11,2.28 MPa respectively.All of them were within the range of strength that the material can bear,and the influence can be ignored.Furthermore,the vibration frequency 2.50 Hz of the wind rotor was much less than its first natural frequency 9.22 Hz,no resonance occurred,and it was safe and reliable.The research results can provide a theoretical basis for the application of the Straight-Bla-ded Vertical Axis Wind Turbine with Wind Gathering Device in the high-cold and high-altitude area.