Open AccessA comparative study on accurate prediction of cavitation characteristics for head drop in a mixed-flow pump with steady- and unsteady-state analysis
Author(s) -
Young Dong Kim,
Sung Hoon Kim,
Hyeon-Mo Yang,
KyoungYong Lee,
Yong-Kab Lee,
Yeong Suk Choi
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 - 10.1088/1742-6596/1909/1/012070
Subject(s) - mechanics , cavitation , suction , head (geology) , steady state (chemistry) , drop (telecommunication) , oscillation (cell signaling) , flow (mathematics) , inlet , pressure drop , materials science , thermodynamics , physics , geology , chemistry , engineering , mechanical engineering , biochemistry , geomorphology
The cavitation characteristics for the head drop in a mixed-flow pump were investigated with the steady- and unsteady-state analysis. Two mixed-flow pump models exhibiting a different incidence angle were analyzed under the cavitation condition. The model with a larger incidence angle obtains relatively poor suction performance. Moreover, the steady-and unsteady-state analysis indicate different head level under the cavitation condition. The results of the unsteady-state analysis are more accurate to the experimental results. The head of a fully convergent steady-state analysis is not even distributed in the head fluctuation range of the unsteady-state analysis. However, the head drop due to the decrease of inlet pressure has almost the same distribution and gradient. In addition, the amount and shape of the bubbles were presented with the time variation, which were also compared with the averaged result of steady-state analysis. The bubbles show a larger oscillation in the model which has a larger incidence angle. The oscillation of the bubbles is related to the magnitude of the head fluctuation.