潮流能水轮机单向流固耦合计算方法

Calculation method of fluid and structure interaction in a vertical-axis ticlal current turbine

基于ANSYS和CFX软件实现了垂直轴潮流能水轮机单向流固耦合瞬态计算。将二维CFX流体计算结果作为水轮机受力,将流体与结构中相对应的节点压力施加到结构有限元模型上,从而完成水轮机工作状态主轴应变计算。将计算结果与实验结果进行对比发现二者吻合较好,说明单向流固耦合方法是将流体计算结果传递到结构分析的有效方法,在潮流能水轮机叶片小变形的条件下能够准确的预报结构响应的趋势,有效的计算垂直轴水轮机的结构强度,对其结构校核起到很好的指导作用。

Based on ANSYS and CFX software, the calculation method of fluid and structure interaction in a vertical-axis tidal current turbine （VATC） was presented. 2-D CFX fluid calculation results were taken as loads exerted on the water turbine, the correponding stresses at nodes between fluid and structure were exerted on the FE model of the structure, then the strain calculation of the main shaft of the water turbine was completed. By comparison, the numerical calculation results were coincided well with the test ones. Therefore, it was shown that the proposed numerical calculation method is an effective method to transfer the fluid computing results to the structural analysis, and can forecast the trend of the structure response under the small deformation of the blades of the turbine, it is effective to compute and to check the structural strength of a VATC turbine.