Analysis of unsteady wake flow in centrifugal pump volute by using mode decomposition method

IF 2.3 4区工程技术 Q2 ENGINEERING, MECHANICAL

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering Pub Date : 2024-08-26 DOI:10.1177/09544089241272877

Xuebing Chen, Renhui Zhang, Guangqiang Guo, Junhu Yang, Zhi Zheng

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引用次数: 0

Abstract

To analyze the coherent structure of wake flow in volute and its corresponding frequency information, dynamic modal decomposition (DMD), classic and spectral proper orthogonal decomposition (SPOD), were employed to decompose the transient flow field of the centrifugal pump volute. The snapshot set was constructed by means of the velocity field data at different moments in volute based on the large eddy simulation (LES) approach. The basic principles of the DMD, POD, and SPOD methods were compared in detail, and the decomposition results of the three methods on the wake flow structure in volute were compared and analyzed. The analysis results show that DMD can decompose the wake flow into coherent structures with different frequencies, including the basic steady-state structure, the dynamic modal flow field structure characterizing rotor–stator interaction (the first three modes with frequencies of 145.81, 291.61, and 437.43 Hz, respectively), and dissipative modal flow field structure characterizing fragmentized vortex (the fourth mode with a frequency of 486.03 Hz) in the volute. The POD can decompose the wake flow into flow structures with different energy levels. The first four modal energies account for more than 66% of total energy, which represents the large-scale structure with higher energy, and its dominant frequencies correspond to the blade passing frequency (145 Hz) and its frequency multiplication (290 Hz). The SPOD can not only decompose the complex wake flow into structural features of different energy levels but also has single-frequency characteristics of its modal structures. Compared with DMD and POD methods, the SPOD has the advantages of both, and can reflect the evolution characteristics of the wake flow in the volute.

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利用模态分解法分析离心泵涡流中的非稳态唤醒流

为了分析涡流中尾流的相干结构及其相应的频率信息，采用了动态模态分解（DMD）、经典分解和频谱正交分解（SPOD）来分解离心泵涡流的瞬态流场。快照集是通过基于大涡流模拟（LES）方法的涡道内不同时刻的速度场数据构建的。详细比较了 DMD、POD 和 SPOD 方法的基本原理，并对比分析了三种方法对涡流尾流结构的分解结果。分析结果表明，DMD 可将涡流分解为不同频率的相干结构，包括基本稳态结构、表征转子与定子相互作用的动态模态流场结构（前三个模态的频率分别为 145.81、291.61 和 437.43 Hz）以及表征碎片化涡旋的耗散模态流场结构（第四个模态的频率为 486.03 Hz）。POD 可以将尾流分解为具有不同能量水平的流动结构。前四个模态能量占总能量的 66%以上，代表能量较高的大规模结构，其主导频率与叶片通过频率（145 Hz）及其倍频（290 Hz）相对应。SPOD 不仅能将复杂的尾流分解为不同能量等级的结构特征，而且其模态结构还具有单频特征。与 DMD 和 POD 方法相比，SPOD 具有二者的优点，能够反映涡流中尾流的演变特征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 工程技术-工程：机械

CiteScore

3.80

自引率

16.70%

发文量

370

审稿时长

6 months

期刊介绍： The Journal of Process Mechanical Engineering publishes high-quality, peer-reviewed papers covering a broad area of mechanical engineering activities associated with the design and operation of process equipment.