考虑流固耦合的轴流式叶片强度分析

Strength of axial flow blades considering fluid-structure interaction

以轴流式水轮机全流道三维湍流数值计算结果为基础,分析水轮机的压力脉动;采用弹性力学非稳态有限元法分析轴流式叶片的强度;利用弱耦合技术,对固体域和流体域进行顺序迭代,并进行了水轮机的流固耦合分析.结果表明,在水压力作用下,叶片变形的最大位移发生在叶片出水边靠近叶片外缘处,最大应力出现在叶片上端面和法兰相接处,叶片变形对压力脉动的幅值影响明显.

Based on 3D turbulent numerical simulation results of the whole passage in axial flow turbines, the pressure fluctuation of the Kaplan turbine was analyzed. A strength analysis of the axial flow blades was carried out using an elastic-mechanical unsteady FEM. The fluid domain and solid domain were calculated through sequential iteration using weak coupling technology, and the coupled fluid and solid for the turbines was analyzed. The results show that, in response to water pressure, the maximum displacement occurs at the outlet close to the outside edge of the blades, and the maximum stress occurs at the intersection between the outlet end and flange of the blades. The deformation of the blades has an obvious influence on the amplitude of the pressure fluctuation.