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

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

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.

Suggested Citation

  • Ye, Jin & Li, Wei & Wang, Xingyuan & Ji, Leilei & Agarwal, Ramesh & Lu, Zhanxiong, 2025. "Reduced-order variational Mode decomposition of transient flow fields in mixed-flow pumps during startup," Energy, Elsevier, vol. 334(C).
    • Handle: RePEc:eee:energy:v:334:y:2025:i:c:s0360544225032219
    DOI: 10.1016/j.energy.2025.137579
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