Analysis of Unsteady Flow Characteristics Near the Cutwater by Cutting Impeller Hub in a High-Speed Centrifugal Pump
Abstract
:1. Introduction
2. Geometric and Mesh Generation
2.1. Geometric Model
2.2. Mesh Generation and Numerical Simulation Method
2.3. Eternal Characteristic Analysis
3. Internal Flow Analysis
3.1. Static Pressure Analysis
3.2. Vortex Distribution Analysis
3.3. Velocity Streamline Analysis
3.4. Pressure Pulsation Analysis
4. Hydraulic Loss Analysis
4.1. Impeller Passage Friction Loss
4.2. Dynamic and Static Interference Loss
5. Conclusions
- Cutting the hub of the impeller can improve the static pressure distribution and vortex distribution near the cutwater of the centrifugal pump. It also results in a more uniform velocity streamline distribution near the cutwater. Additionally, the modified centrifugal pump shows certain improvements in the Omega vortex distribution compared to the prototype pump PB.
- The modified centrifugal pump exhibits a reduced amplitude of pressure pulsation in the frequency domain compared to the prototype pump at various flow conditions. Cutting the hub of the impeller has a certain suppressive effect on the pressure pulsation at the cutwater of the centrifugal pump. In conclusion, cutting the hub of the impeller can enhance the performance of the centrifugal pump.
- By applying empirical formulas to calculate the hydraulic loss of the centrifugal pump, it was found that the impeller passage friction loss and the dynamic and static interference loss were the main sources of hydraulic loss. Cutting the hub of the impeller had a certain inhibitory effect on the hydraulic loss.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Nomenclature
Qd | Design flow rate |
Hd | Head |
n | Rotating speed |
ns | Specific speed |
Z1 | Main blade |
Ds | Pump inlet diameter |
DO | Pump outlet diameter |
D1 | Impeller inlet diameter |
D2 | Impeller outlet diameter |
b1 | Impeller Inlet width |
b2 | Impeller Exit width |
u2 | The velocity at the impeller outlet |
P | The average static pressure at a certain section |
Pin | The average static pressure at the impeller inlet section |
ρ | The density of the fluid |
Da | The average diameter |
W1 | The relative velocities at the inlet of the impeller |
W2 | The relative velocities at the outlet of the impeller |
la | The length of the passage |
Z | The number of impeller blades |
λ | The friction resistance coefficient |
Vm2 | The axial velocity at the impeller outlet |
ns | The specific speed |
Vs | The average velocity near the cutwater of the volute casing |
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Parameter | Value |
---|---|
Design flow rate (m3/h) | 12 |
Head (m) | 2153 |
Rotating speed (r/min) | 23,350 |
Specific speed | 82.3 |
Main blade | 12 |
Pump inlet diameter(mm) | 82 |
Pump outlet diameter (mm) | 50 |
Impeller inlet diameter (mm) | 54 |
Impeller outlet diameter (mm) | 140 |
Impeller inlet width (mm) | 10 |
Impeller exit width (mm) | 4 |
Experimental Number | Experimental Head Coefficient |
---|---|
1 | 1.275 |
2 | 1.289 |
3 | 1.265 |
4 | 1.296 |
5 | 1.25 |
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Cui, B.; Shi, M. Analysis of Unsteady Flow Characteristics Near the Cutwater by Cutting Impeller Hub in a High-Speed Centrifugal Pump. J. Mar. Sci. Eng. 2024, 12, 587. https://doi.org/10.3390/jmse12040587
Cui B, Shi M. Analysis of Unsteady Flow Characteristics Near the Cutwater by Cutting Impeller Hub in a High-Speed Centrifugal Pump. Journal of Marine Science and Engineering. 2024; 12(4):587. https://doi.org/10.3390/jmse12040587
Chicago/Turabian StyleCui, Baoling, and Mingyu Shi. 2024. "Analysis of Unsteady Flow Characteristics Near the Cutwater by Cutting Impeller Hub in a High-Speed Centrifugal Pump" Journal of Marine Science and Engineering 12, no. 4: 587. https://doi.org/10.3390/jmse12040587