Energy Performance and Pressure Fluctuation of a Multiphase Pump with Different Gas Volume Fractions
Abstract
:1. Introduction
2. Physical Model and Computational Mesh
2.1. Physical Model of a Multiphase Pump
2.2. Computational Mesh of a Multiphase Pump
2.3. Data Collection Sites Setting
3. Numerical Methods and Setting
3.1. Numerical Methods
3.2. Independence Test of Mesh Number
3.3. Independence Test of Time Steps
3.4. Simulation Validation
4. Result and Discussion
4.1. Energy Performance
4.2. Pressure Fluctuation
4.3. Gas Volume Fraction
4.4. Vortex Structure
4.5. Velocity Distribution
5. Conclusions
- (1)
- The pressure rise decreases with the increase in flow rate, and the pressure rise and efficiency both decrease with the increase of GVFs.
- (2)
- The dominant frequency of pressure fluctuations in the impeller are eleven times those of the impeller rotational frequency, and the dominant frequency of the pressure fluctuations in the diffuser are three times those of the impeller rotational frequency. GVF has a great influence on the pressure fluctuations of the dominant frequency, but little impact on the secondary frequency.
- (3)
- Due to the larger density of water and the centrifugal force, the water is pushed to the shroud, which makes the GVF near the hub higher. A vortex develops at the blade suction side near the leading edge, induced by the leakage flow, and further affects the pressure fluctuation in the impeller. An obvious vortex in the diffuser indicates that the design of the divergence angle of the diffuser is not correct, which induces flow separation due to the large diffusion ratio.
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Component | Item | Value |
---|---|---|
Multiphase pump | Rated volume flow rate Qd (m3/h) | 100 |
Rated pressure rise pr (at GVF0 %) (kPa) | 230 | |
Rated rotational speed n (r/min) | 3600 | |
Impeller | Numbers of blade Zi | 3 |
Tip clearance (mm) | 0.5 | |
Diameter of impeller inlet D1 (mm) | 22 | |
Diameter of impeller outlet D2 (mm) | 15 | |
Tip clearance (mm) | 0.5 | |
Diffuser | Numbers of vane Zd | 11 |
Diameter of diffuser inlet D3 (mm) | 16 | |
Diameter of diffuser outlet D4 (mm) | 22 |
Item | Mesh 1 | Mesh 2 | Mesh 3 | Mesh 4 | Mesh 5 |
---|---|---|---|---|---|
inlet pipe | 103,132 | 201,780 | 201,780 | 201,780 | 443,916 |
Impeller | 367,074 | 819,324 | 1,629,417 | 2,324,412 | 2,784,096 |
diffuser | 297,880 | 387,244 | 476,608 | 518,925 | 518,925 |
outlet pipe | 107,996 | 201,608 | 201,608 | 449,036 | 907,236 |
total meshes | 876,082 | 1,609,956 | 2,509,413 | 3,494,153 | 4,654,173 |
pr (kPa) | 190.34 | 196.74 | 197.63 | 198.79 | 198.74 |
η (%) | 62.27% | 62.61% | 62.70% | 62.73% | 62.76% |
pr/pr1 | 1 | 1.0336 | 1.0383 | 1.0444 | 1.0441 |
η/η1 | 1 | 1.0055 | 1.0069 | 1.0074 | 1.0079 |
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Zhang, J.; Tan, L. Energy Performance and Pressure Fluctuation of a Multiphase Pump with Different Gas Volume Fractions. Energies 2018, 11, 1216. https://doi.org/10.3390/en11051216
Zhang J, Tan L. Energy Performance and Pressure Fluctuation of a Multiphase Pump with Different Gas Volume Fractions. Energies. 2018; 11(5):1216. https://doi.org/10.3390/en11051216
Chicago/Turabian StyleZhang, Jinsong, and Lei Tan. 2018. "Energy Performance and Pressure Fluctuation of a Multiphase Pump with Different Gas Volume Fractions" Energies 11, no. 5: 1216. https://doi.org/10.3390/en11051216