Analysis of Unsteady Flow Structures in a Centrifugal Impeller Using Proper Orthogonal Decomposition
Analysis of Unsteady Flow Structures in a Centrifugal Impeller Using Proper Orthogonal Decomposition
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DOI：
10.47176/jafm.14.01.31229
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Z. Liao;J. Yang;X. Liu;W. Hu;X. Deng
中科院分区：
文献类型：
--
作者：
Z. Liao;J. Yang;X. Liu;W. Hu;X. Deng
应用本征正交分解（POD）方法，揭示了无叶离心泵叶轮内主要非定常流动结构的发生和发展。选择四个径向面的压力和速度数据作为分解变量。结果表明，该方法有利于在流场结构间无强相互作用时的流场分析。当流量从设计流量开始降低时，叶轮中开始出现并发展流动分离和尾迹等不稳定流动现象。POD分析揭示了在流场结构间不存在混合或相互作用较小的情况下，主要非定常结构对流场的影响。研究了叶轮吸力面分离和尾缘尾迹随流量变化的发展规律。然而，随着运行工况与设计工况的距离越来越远，叶轮内部的流场变得越来越复杂，需要结合其他方法才能更好地分析流场。
The occurrence and development of the dominant unsteady flow structures in a vanless centrifugal pump impeller are revealed by the proper orthogonal decomposition (POD) method. The pressure and velocity data of four radial surfaces is selected as the variables of decomposition. The results show that this method is beneficial to the analysis of flow field when there is no strong interaction of flow structures. When the flow rate starts to decrease from the design flow rate, unstable flow phenomenon such as flow separation and wake begin to appear and develop in the impeller. The POD analysis reveals the influence of the main unsteady structures on the flow field when there is no mixed or have little interaction among flow structures. It outlines the development of flow separation near the suction side of impeller and the wake near the trailing edge as the flow rate changes. However, the flow field inside the impeller becomes more and more complex as the operation condition is far away from the design condition, which needs to be combined with other methods to better analyze the flow field.