Study on Distribution Law of Gas Phase and Cavitation in the Pressurization Unit of Helical Axial Flow Multiphase Pump

Due to the irregular change of gas void fraction (GVF) in multiphase pumps, the pressure distribution in the pump is often uneven, which leads to the formation of low-pressure area and thus the occurrence of cavitation. In order to study the gas phase and cavitation distribution in the impeller regi...

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Bibliographic Details
Published in:Journal of marine science and engineering 2022-11, Vol.10 (11), p.1795
Main Authors: Xiao, Yexiang, Gui, Zhonghua, Li, Xuesong, Tao, Sijia, Shi, Guangtai, Gu, Chunwei
Format: Article
Language:English
Subjects:
Axial flow
Axial flow pumps
Cavitation
cavitation performance
Design techniques
Distribution
distribution of cavitation
Efficiency
Energy resources
Gases
gas–liquid two phases
Helical flow
Impellers
Influence
Inlets (waterways)
Low pressure
Multiphase
multiphase pump
Pressure distribution
Pumps
Simulation
Streamlines
Vapor phases
Velocity
Viscosity
Void fraction
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Summary:Due to the irregular change of gas void fraction (GVF) in multiphase pumps, the pressure distribution in the pump is often uneven, which leads to the formation of low-pressure area and thus the occurrence of cavitation. In order to study the gas phase and cavitation distribution in the impeller region of a multiphase pump under different cavitation stages and GVF conditions, this study used numerical calculations as the main method and experimental verification as a secondary method to investigate the cavitation phenomenon in the pump under different stages and GVF conditions. The results showed that at different stages, both the volume fraction and the covering area of the gas phase were reduced to a certain extent with the increase in blade height, and the distribution law of the gas phase on the blade changed with the development of the cavitation stage, especially on the blade surface. At different GVFs, cavitation first occurred at the inlet of the blade SS and then extended along the blade streamline from the inlet to outlet, with the volume fraction and distribution of cavitation gradually increasing and then extending to the blade PS. The results showed that the presence of the gas phase inhibited the development of cavitation in the multiphase pump to some extent, and the cavitation performance of the multiphase pump was better in the presence of the gas phase than in pure water conditions. The results of this study provide a theoretical basis for improving the cavitation performance of multiphase pumps.
ISSN:2077-1312
2077-1312
DOI:10.3390/jmse10111795