基于单向流固耦合的潮流能水轮机叶片强度及模态分析

Strength and Modal Analysis of Tidal Current Energy Turbine's Blades Based on the One Way Fluid-Structure Interaction

叶片作为潮流能水轮机叶轮的关键部件,在其工作过程中受到水流的作用力,会对其安全性与稳定性有一定的影响。文中基于Workbench,先用CFX软件对水平轴潮流能水轮机叶轮在正常流速和最大流速情况下所受流体作用力进行了稳态数值模拟;然后在Workbench内完成流体域和结构域两个物理场之间数据的传递,采用单向流固耦合的方法将流场载荷施加到叶片结构上并对其进行了强度分析,得到了叶片变形及应力的变化情况;最后对叶片进行了模态分析,得到叶片各阶模态振型、频率及最大变形量,并且对结果进行了分析。

As the key components of a tidal current energy turbine, the blades will be affected by the force of the water flow when the turbine is working,thus having an effect on the tidal current energy turbine ’s safety and stability. In this paper,based on the Workbench,steady simulation was performed to get the force of the water flow on the turbine at the normal and maximum current speed using the software CFX. Then the data between the fluid field and structure field were transferred in the Workbench,and the fluid load was applied to the blade structure with the method of one way fluid-structure interaction. The blades’ strength were analyzed and the blades’ deformation and stress were got under different working conditions. At last,through modal analysis of the blades,various order modal shape,various order frequency,and various order maximum deformation were got and studied.