Reduced-order variational Mode decomposition of transient flow fields in mixed-flow pumps during startup

Jin Ye, Wei Li, Xingyuan Wang, Leilei Ji, Ramesh Agarwal and Zhanxiong Lu

Energy, 2025, vol. 334, issue C

Abstract: Transient flow phenomena during mixed-flow pump startup significantly affect energy system efficiency and stability, yet their multi-scale dynamics remain poorly understood. This study employs reduced-order variational mode decomposition (RVMD) to systematically reveal flow evolution patterns during transient startup. Compared to conventional methods (POD/DMD), RVMD effectively isolates low-frequency transient modes (shift mode) and high-frequency periodic modes (blade-passing harmonics) via adaptive frequency-band segmentation and narrow-band mode extraction. Parameter optimization shows that α = 500 and K = 20 balance frequency resolution with physical interpretability. The first two modes (Mode 1: 56 %; Mode 2: 34 %) capture >90 % of the energy, accurately characterizing the static-to-steady flow transition. This work provides a theoretical basis for suppressing transient energy losses and optimizing mixed-flow pump design.

Keywords: Mixed-flow pump; Transient startup; Reduced-order variational mode decomposition (RVMD); Energy evolution; Numerical simulation (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:334:y:2025:i:c:s0360544225032219

DOI: 10.1016/j.energy.2025.137579

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