TY - JOUR
T1 - Influence of axial rotor offset on residual axial thrust characteristics of a centrifugal pump at low flow rates
AU - Takamine, Taiki
AU - Nakano, Shotaro
AU - Watanabe, Satoshi
AU - Watanabe, Hiroyoshi
N1 - Funding Information:
This study has been carried out under the activity of WG2 in HPC (High Performance Computing) Research Committee of Turbomachinery Society of Japan (TSJ). The authors would like to express sincere gratitude to the members of WG2 for fruitful discussions throughout WG2 meetings. The hydraulic design of the test pump was made by Miyagawa Lab. of Waseda University, Japan, and the staffs/students involved are highly appreciated for their contributions. A part of the computation using the finer grid for verification is carried out by Software Cradle Co., Ltd. Finally, we would like to thank to TSJ for the organization of the research committee and to DMW Corporation, Ebara Corporation, Hitachi, Ltd. and Shin Nippon Machinery Co. Ltd. for their financial supports. We would like also to thank to Mr. Wataru Matsumoto, Technician of Kyushu University, for his kind support in the series of present experiments.
PY - 2020/10/1
Y1 - 2020/10/1
N2 - In this study, experimental/numerical investigations on the effect of axial offset of rotor offset in a final stage model of a three-stage centrifugal pump are carried out. The axial offset is intentionally given to the shaft system to 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 flow rate. From the flow field computed in CFD analysis, the flow mechanism induced by the axial offset leading to the change in the axial thrust is elucidated; the interaction between the back flow form the diffuser and the impeller exiting flow is affected by the axial offset, which are responsible for the change in the angular momentum brought into side gaps and therefore in the pressure distribution inside the side gaps.
AB - In this study, experimental/numerical investigations on the effect of axial offset of rotor offset in a final stage model of a three-stage centrifugal pump are carried out. The axial offset is intentionally given to the shaft system to 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 flow rate. From the flow field computed in CFD analysis, the flow mechanism induced by the axial offset leading to the change in the axial thrust is elucidated; the interaction between the back flow form the diffuser and the impeller exiting flow is affected by the axial offset, which are responsible for the change in the angular momentum brought into side gaps and therefore in the pressure distribution inside the side gaps.
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U2 - 10.5293/IJFMS.2020.13.4.655
DO - 10.5293/IJFMS.2020.13.4.655
M3 - Article
AN - SCOPUS:85095595238
VL - 13
SP - 655
EP - 667
JO - International Journal of Fluid Machinery and Systems
JF - International Journal of Fluid Machinery and Systems
SN - 1882-9554
IS - 4
ER -