Method of dynamic mode decomposition and reconstruction with application to a three-stage multiphase pump. (1st October 2020)

• Record Type: Journal Article
• Authors: Liu, Ming; Tan, Lei; Cao, Shuliang
• Is Part Of: Energy. Volume 208(2020)
• Publication Date: 2020-10-01
• Subjects: Multiphase pump -- Dynamic mode decomposition -- Mode reconstruction -- Gas-liquid flow; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2020.118343
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: Helico-axial multiphase pumps are significant equipment in the exploitation of petroleum resources in offshore platforms, and in-depth understanding of gas-liquid flow fields is beneficial for the design and optimization. The method of dynamic mode decomposition and reconstruction is introduced and applied to study gas-liquid flow characteristics in a three-stage multiphase pump. Firstly, the theoretical relation between decomposed results and DMD parameters is investigated. Then, the dominant frequency and corresponding coherent structures inside the multiphase pump are revealed, which are induced by rotor-stator interaction and gas-liquid flow patterns. The reconstruction residual versus mode number represents a stepped curve, and the minimum residuals are below 10 −5 governed by linear combination approximation. Comparison among reduced-order reconstruction, full-order reconstruction, and raw data shows that reduced-order reconstruction fields are effective in reflecting main flow characteristics, but fail to capture high order harmonic components, which is related to complex flow in diffuser passages and following vaneless areas. Highlights: The influence of parameters on decomposed and reconstructed results is studied. The dominant frequency and coherent structure are revealed. The variation of reconstruction residual versus mode number is investigated. The minimum residual is governed by linear combination approximation.