Abstract
The unsteady flows caused by the interaction between the impeller and the volute in a high-speed micro centrifugal pump are numerically studied. The internal flows of both with and without cavitations are analyzed using the CFX. The characteristics of unsteady pressure on the blade surfaces and the symmetric plane of the volute are presented and compared. The results show that the amplitudes of pressure fluctuations of critical cavitation on the blade pressure surface (PS) are bigger as compared with those at the non-cavitation condition, but on the suction surface (SS), the situation is on the contrary. When cavitation occurs, reduction of load in the impeller is a result. In the present study, such reduction of load is observed mainly on the first half of the blades. Pressure fluctuations at five monitoring points, denoted by WK1 to WK5 in the volute, are also analyzed. No matter at the critical cavitation or at the non-cavitation conditions, the monitored pressure fluctuations are at the same frequencies, which equal to the blade passing frequency (BPF) and its multiples. However, the amplitudes of the fluctuations at critical cavitation condition are considerably stronger, as compared with those for without cavitation.
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Abbreviations
- b 2 :
-
blade width at exit[mm]
- BPF :
-
blade passing frequency[Hz]
- C p :
-
static pressure coefficient
- D 2 :
-
diameter of the impeller outlet[mm]
- F cond :
-
cavitation condensation coefficient
- F vap :
-
cavitation vaporization coefficient
- H:
-
head
- n:
-
impeller rotating speed[r/min]
- p in :
-
static pressure of impeller inlet[Pa]
- P rms :
-
the static pressure root-mean-square
- Q :
-
flow rate[m3/h]
- Q d :
-
design flow rate[m3/h]
- S :
-
non-dimensional arc length at the midspan of the blade, from the leading to the trailing edges
- T :
-
period of the impeller rotation[s]
- u 2 :
-
velocity at the impeller outlet[m/s]
- Z :
-
number of blades
- Z s :
-
dimensionless distance from the hub to the shroud
- γ v :
-
volume fraction of vapor
- γ l :
-
volume fraction of liquid
- ρ v :
-
density of vapor
- ρ l :
-
density of liquid[kg/m3]
- η :
-
efficiency[%]
- σ :
-
cavitation number
- ψ :
-
head coefficient
- Θ :
-
surface tension coefficient[N/m]
- σ 3% :
-
cavitation number at which the pump head is degraded by 3% because of cavitation
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Acknowledgments
The study in this paper is funded by the National Natural Science Foundation of China under Grants 51176048 and 51576067.
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This study is funded by the National Natural Science Foundation of China under Grants 51176048 and 51576067.
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Li, Y., Yuan, S. & Lai, H. Numerical study of unsteady flows with cavitation in a high-speed micro centrifugal pump. J. Therm. Sci. 26, 18–24 (2017). https://doi.org/10.1007/s11630-017-0904-0
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DOI: https://doi.org/10.1007/s11630-017-0904-0