基于流固耦合的湿定子潜水贯流泵一体式叶轮强度分析

Strength Analysis of the Submersible Tubular Pump Impeller with Wet Stator Based on Fluid-structure Interaction

湿定子潜水贯流泵有别于一般贯流泵,其水泵叶轮安装在电机转子内腔,电机转子与叶轮为一体式结构。为验证此叶轮结构的安全稳定性,应用ANSYS workbench对其进行单向流固耦合数值模拟分析,研究流固耦合作用下叶轮结构的力学特性,获得了水动力和磁拉力共同作用下叶轮的应力和应变分布。结果表明:叶片根部与尖端出现不同程度的应力集中现象,最大应力出现在叶片工作面尖端;叶片变形分布径向梯度明显,与叶片半径呈正比关系;叶轮强度校核结果满足要求。研究成果可为湿定子潜水贯流泵叶轮结构优化设计与水力特性分析提供参考。

Submersible tubular pump with wet stator is different from other tubular pumps, for its impeller is installed in the inner cavity of the motor rotor. In other words, the rotor and the impeller are integrated. To verify the safety and stability of the impeller, the one-way fluid-structure interaction is performed, utilizing the ANSYS Workbench. The stress and strain distributions of the impeller under the combined action of hydrodynamic force and magnetic pull force are obtained. The results show that the stress concentration appears at the root and the tip region of the blades, and the maximum stress occurs at the tip region of each blade's working face. The deformation of the blade increases obviously along the radial direction, that is, the blade deformation is proportional to its radius. The strength check result shows that the impeller meets the requirement for operation. The presented results are believed to provide a reference for structural optimization design and hydraulic characteristics analysis of submersible tubular pump with wet stator.