Open AccessEffect of axial offset of rotor on thrust characteristics of a centrifugal pump
Author(s) -
Taiki Takamine,
Satoshi Nakano,
Satoshi Watanabe,
Hiroyoshi Watanabe
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1909/1/012073
Subject(s) - axial compressor , mechanics , offset (computer science) , thrust , stator , axial flow pump , centrifugal pump , rotor (electric) , volumetric flow rate , computational fluid dynamics , materials science , structural engineering , engineering , mechanical engineering , physics , impeller , gas compressor , variable displacement pump , computer science , reciprocating pump , programming language
To ensure the reliability of multi-stage centrifugal pumps, the prediction of axial thrust is an important issue for the design of balancing device and selection of thrust bearing. However, it is known that the fluid forces acting on rotor could be sensitively affected by the geometrical relations between rotor and stator especially at the low flow rate. Among them, the effect of axial offset of rotor has not been studied sufficiently though the axial offset is easily caused by accumulation of manufacturing tolerances and assembling errors. In this study, experimental/numerical investigations on the effect of axial rotor offset in a final stage model of a three-stage centrifugal pump are carried out. The axial offset is intentionally given to shaft system to the both of discharge/suction side. As a result, the axial thrust is significantly affected by the axial offset in the flow rate range below 50% of the design. It is shown by CFD analysis that this effect of axial offset is caused by the interaction between the back flow from the diffuser and the main flow.