Rotordynamic Force Prediction of Whirling Centrifugal Impeller Shroud Passages Using Computational Fluid Dynamic Techniques
Rotordynamic Force Prediction of Whirling Centrifugal Impeller Shroud Passages Using Computational Fluid Dynamic Techniques
复制标题
DOI：
10.1115/1.1385829
复制
发表时间：
1999-06
影响因子：
1.5
通讯作者：
J. Jeffrey Moore;A. Palazzolo
中科院分区：
文献类型：
--
作者：
J. Jeffrey Moore;A. Palazzolo
现代离心涡轮机械对更高效率和性能的需求要求提高材料强度、空气动力学和转子动力学等关键设计因素的知识。虽然有限元应力分析和计算流体动力学（CFD）的巨大进步已经解决了前两个领域的问题，但由于缺乏准确的离心叶轮预测工具，通常会将转子动力学排除在设计循环之外。虽然有一些作者分析了带冠离心式叶轮产生的转子动力，但尚未对二次叶冠通道与三维一次流模型的耦合进行研究。这些领域之间的强相互作用使这种方法具有优势。本研究利用CFD技术对离心泵叶轮内的全三维粘性一次/二次流场进行分析，以确定叶轮内的转子动力。偏心三维模型在不同进动频率比下的多个准稳态解产生转子动力阻抗。执行二阶最小二乘分析生成偏对称刚度、阻尼和质量矩阵。结果表明，其性能和旋转动力与实验结果吻合较好。
The demand for higher efficiencies and performance of modern centrifugal turbomachinery requires improved knowledge of critical design factors in strength of materials, aerodynamics, and rotordynamics. While tremendous strides in finite element stress analysis and computational fluid dynamics (CFD) have addressed the first two areas, the lack of accurate prediction tools for centrifugal impellers typically leaves rotordynamics out of the design loop. While several authors have analyzed the rotordynamic forces arising from shrouded centrifugal impellers, there has been no study to couple the secondary shroud passage with the three-dimensional primary flow model. The strong interaction between these domains makes this approach advantageous. The current study utilizes CFD techniques to analyze the full three-dimensional viscous, primary/secondary flow field in a centrifugal pump impeller to determine rotordynamic forces. Multiple quasisteady solutions of an eccentric three-dimensional model at different precessional frequency ratios yield the rotordynamic impedance forces. Performing a second order least-squares analysis generates the skew-symmetric stiffness, damping, and mass matrices. The results show good correlation with experiment for both performance and rotordynamic forces.