Dynamic mode decomposition of gas-liquid flow in a rotodynamic multiphase pump. (August 2019)

• Record Type: Journal Article
• Authors: Liu, Ming; Tan, Lei; Cao, Shuliang
• Is Part Of: Renewable energy. Volume 139(2019)
• Page Start: 1159
• Page End: 1175
• Publication Date: 2019-08
• Subjects: Multiphase pump -- Dynamic mode decomposition -- Transient characteristics -- Flow structure -- Multiphase flow; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2019.03.015
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: Rotodynamic multiphase pump is vital for energy conversion and oil-gas exploitation. In the present work, the complicated transient characteristics of gas-liquid two phase flow in a multiphase pump under 10% and 20% inlet GVFs are investigated by Dynamic Mode Decomposition (DMD). Results show that the strip-shaped gas volume develops in impeller and then leads to jet impingement at diffuser inlet, which induces the inception of gas pocket in diffuser passage. The major vortex structures in the multiphase pump consist of leading edge vortex in impeller and diffuser, separation vortex in impeller, tip leakage vortex in impeller, trailing edge vortex in impeller and diffuser. Dynamic modes under significant frequency show that, the main structures are the radial inhomogeneity near pressure side in impeller, and the back flow phenomenon near suction side in diffuser. Highlights: 10% and 20% inlet GVFs in a rotodynamic multiphase pump are investigated. Strip-shaped gas volume is vital for gas-liquid flow pattern. Dynamic mode decomposition is used to decompose coherent structure of multiphase flow. Dominant frequency and main structure under various inlet GVFs are revealed.