预应力与水介质对轴流泵叶轮模态的影响

Influence of Pre-stress and Aqueous Medium on Impeller Modal of Axial-flow Pump

为了研究预应力与水介质对于轴流泵叶轮结构模态的影响,结合南水北调工程中某轴流泵模型试验,基于流固耦合基本思想,通过在ANSYS WORKBENCH中耦合APDL命令流的方法,计算了水介质中轴流泵转动结构的模态,在考虑预应力情况下同时对比了整个轴流泵叶轮在水介质中及空气中的模态变化,并通过单向耦合方法计算了加载预应力对于整个转动结构的模态影响。结果表明,水介质对于叶轮的固有频率有明显的减小作用,而预应力对于整个模态的影响并不明显。

In order to study the impact of pre-stress and aqueous medium on axial-flow pump impeller modal,with a model test of axial-flow pump in South-to-North Water Diversion Project,the flow of aqueous medium modal distribution of axial flow rotary mechanism was calculated through the coupling APDL command stream in ANSYS WORKBENCH with the basic idea of fluid-solid coupling.And then the modal change of axial-flow impeller in aqueous medium and in the air was compared under prestressed case.The one-way coupling method is used to calculate the impact of loading prestress on the modal of the entire rotational structure.The results show that the effect of aqueous medium for reduction of the impeller natural frequency is significant while the impact of the pre-stress on the modal is not obvious.