摘要
根据几何非线性问题中的有限变形理论,考虑水体的压缩性用有限元法的位移-压力格式及Galerkin法对混流式水轮机叶片-流体组成的流固耦合系统进行离散,建立了考虑应力刚化影响的转轮叶片流固耦合系统的振动控制方程,并用考虑初应力刚度的有限元法分别对整体转轮叶片及单叶片的耦合模态进行了大量计算,详细分析了旋转离心力和水压力以及流体密度的变化对叶片动力特性的影响,初步揭示其影响规律.
According to the finite deflection theory of geometric non - linear problem, a Francis hydro - turbine runner with fluid is discretized by Galerkin method, and a displacement - pressure scheme is used to consider fluid - structure interaction. The governing equations of the vibration are developed to take into account the influences of the initial stress and fluid compressibity on the dynamic characteristics of the blades. The influences of the centrifugal force, pressure and fluid compressibity on the vibration of the blades are comparatively analyzed with FEM. The results show the basic change laws of the dynamic characteristics of the blade.
出处
《昆明理工大学学报（理工版）》
2005年第6期34-40,共7页
Journal of Kunming University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金重大基础研究计划项目(项目编号:90210005)
关键词
混流式水轮机
流固耦合
模态分析
有机变形理论
Francis hydro turbine
fluid -structure interaction
modal analysis
finite defomation theory
