NDLI: Evolution Characteristics of Suction-Side-Perpendicular Cavitating Vortex in Axial Flow Pump under Low Flow Condition

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Evolution Characteristics of Suction-Side-Perpendicular Cavitating Vortex in Axial Flow Pump under Low Flow Condition

Content Provider	MDPI
Author	Wang, Lin Tang, Fangping Chen, Ye Liu, Haiyu
Copyright Year	2021
Description	In order to study the evolution characteristics of suction-side-perpendicular cavitating vortex in an axial-flow pump under low flow conditions, model tests, high-speed imaging, and an SST-CC turbulence model were used to simulate the external characteristics and cavitation morphology of the pump. The evolution law of suction-side-perpendicular cavitating vortex (SSPCV) was revealed by turbulent kinetic energy, liutex vortex identification, and vorticity transport equation. The results show that the evolution of suction-side-perpendicular cavitating vortex at low cavitation number can be divided into three stages: generation, development, and breaking stage. In the generation stage, the turbulent kinetic energy, velocity gradient and vortex kinetic energy continue to increase, reaching the maximum at the early stage of development. Afterwards, due to the viscosity of the water, the vortex slowly dissipates and enters the stage of development. Finally, it is affected by the next blade and enters the breaking stage, which accelerates the dissipation of the vortex. The vortex stretching term and vortex expansion term are the main contributors to the vorticity. During the development of the vortex, the vorticity is mainly caused by the deformation of the fluid micelle. The breaking stage mainly affects the stretching term, and the Coriolis force term cannot be ignored in the rotating coordinates.
Starting Page	1058
e-ISSN	20771312
DOI	10.3390/jmse9101058
Journal	Journal of Marine Science and Engineering
Issue Number	10
Volume Number	9
Language	English
Publisher	MDPI
Publisher Date	2021-09-25
Access Restriction	Open
Subject Keyword	Journal of Marine Science and Engineering Marine Engineering Axial-flow Pump Cavitation Suction-side-perpendicular Cavitating Vortex Vortex Identification Vorticity Transport Equation
Content Type	Text
Resource Type	Article

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