Influence of Fluid Viscosity on Cavitation Characteristics of a Helico-Axial Multiphase Pump (HAMP)
Abstract
:1. Introduction
2. Numerical Simulation Method
2.1. HAMP Geometry Model
2.2. Meshing of Calculation Domain
2.3. Numerical Scheme
2.4. Cavitation Model
2.5. Numerical Method Validation
3. Results and Discussions
3.1. Cavitation Characteristic Curve of HAMP
3.2. VVF Distribution in Impeller Passage
3.3. VVF on Blade Surface
3.4. Velocity Distribution in Impeller
4. Conclusions
- (1)
- The Net Positive Suction Head-available decreased as the fluid viscosity increased under the critical cavitation condition. It decreased from 5.11 m to 3.68 m as the fluid viscosity increased from 24.46 mm2/s to 120.0 mm2/s. Cavitation was more prone to occur in the pump impeller under high viscosity condition. The cavitation number increased from 0.08213 to 0.08574 when the Reynolds number increased from 3.58 × 104 to 8.73 × 104, which also demonstrated that the pump cavitation characteristics would be deteriorated as the fluid viscosity increased when the flow rate was held constant.
- (2)
- In general, the VVF reduced along the impeller passage. Under the critical cavitation condition, the VVF was basically unchanged as the fluid viscosity increased from 24.46 mm2/s to 48.48 mm2/s. Then, the VVF around the leading edge of the blade significantly reduced as the fluid viscosity increased to 60.70 mm2/s. The area occupied by the vapor increased with the fluid viscosity. Nearly half of the flow passages were occupied by cavitation bubbles when the fluid viscosity increased to 120.0 mm2/s.
- (3)
- The VVF on the suction surface was gradually spread out from the leading edge to the trailing edge of the blade, and the VVF on both the suction surface and pressure surface increased with the fluid viscosity. When the fluid viscosity was 24.46 mm2/s, the vapor on the suction surface was mainly distributed in the region with the streamwise between 0 and 0.36; while the high VVF range increased to the streamwise of 0.42 when the fluid viscosity increased to 120.0 mm2/s. The VVF in this region also approximately increased from 0.1 to 0.3.
- (4)
- The pressure distribution exhibited the opposite trend with the VVF distribution. The decrease in the pressure in the impeller led to the increase in the cavitation bubble. The turbulent kinetic energy on both the suction surface and pressure surface increased with the fluid viscosity, which also resulted in more cavitation bubbles being produced. The velocity distribution in the impeller suggested that the velocity was basically the same with the viscosity of 24.46 mm2/s and 48.48 mm2/s. When the viscosity was further increased to 60.70 mm2/s, the maximum velocity area in the impeller was relatively large.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Parameter | Impeller | Diffuser | Unit |
---|---|---|---|
Shroud diameter | 135 | 135 | mm |
Hub inlet diameter | 94.5 | 105 | mm |
Hub outlet diameter | 105 | 94.5 | mm |
Axial length | 50 | 50 | mm |
Number of blades | 4 | 15 | - |
Blade wrap angle | 175.5 | 25.6 | ° |
Tip clearance | 0.54 | 0 | mm |
Component | Mesh Number (N) | |||
---|---|---|---|---|
1 | 2 | 3 | 4 | |
Inlet section | 63,290 | 175,915 | 197,788 | 255,099 |
Impeller | 1,758,452 | 3,668,160 | 5,275,676 | 6,570,704 |
Outlet section | 178,913 | 186,142 | 230,522 | 292,592 |
Total mesh number | 2,000,655 | 4,030,217 | 5,703,986 | 7,118,395 |
Fluid No. | Medium | Density (kg/m3) | Kinematic Viscosity (mm2/s) | Dynamic Viscosity (Pa·s) | Saturated Vapor Pressure (Pa) | Surface Tension (N/m) | Non-Condensable Gas Content (ppm) |
---|---|---|---|---|---|---|---|
1 | Liqud | 839 | 24.46 | 2.0530 × 10−2 | 4000.0 | 3.0 × 10−2 | 40 |
Vapor | 0.4650 | 0.5916 | 2.7511 × 10−4 | ||||
2 | Liqud | 851 | 48.48 | 4.1256 × 10−2 | 4000.0 | 3.0 × 10−2 | 40 |
Vapor | 0.4716 | 1.1723 | 5.5284 × 10−4 | ||||
3 | Liqud | 858 | 60.70 | 5.2081 × 10−2 | 4000.0 | 3.0 × 10−2 | 40 |
Vapor | 0.4755 | 1.4881 | 7.0760 × 10−4 | ||||
4 | Liqud | 865 | 120.0 | 1.0380 × 10−1 | 4000.0 | 3.0 × 10−2 | 40 |
Vapor | 0.4796 | 2.1364 | 1.0246 × 10−3 |
Project | Parameter |
---|---|
Multiphase flow model | Mixture model |
Cavitation Model | Singhal model |
Turbulence model | RNG k-ε |
Inlet boundary | Pressure inlet |
Outlet boundary | Mass flow outlet |
Wall condition | Smooth, no-slip wall |
Pressure-velocity coupling | Coupled |
Moment spatial discretization | Second Order Upwind |
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Ye, K.; He, D.; Zhao, L.; Guo, P. Influence of Fluid Viscosity on Cavitation Characteristics of a Helico-Axial Multiphase Pump (HAMP). Energies 2022, 15, 8149. https://doi.org/10.3390/en15218149
Ye K, He D, Zhao L, Guo P. Influence of Fluid Viscosity on Cavitation Characteristics of a Helico-Axial Multiphase Pump (HAMP). Energies. 2022; 15(21):8149. https://doi.org/10.3390/en15218149
Chicago/Turabian StyleYe, Kaijie, Denghui He, Lin Zhao, and Pengcheng Guo. 2022. "Influence of Fluid Viscosity on Cavitation Characteristics of a Helico-Axial Multiphase Pump (HAMP)" Energies 15, no. 21: 8149. https://doi.org/10.3390/en15218149
APA StyleYe, K., He, D., Zhao, L., & Guo, P. (2022). Influence of Fluid Viscosity on Cavitation Characteristics of a Helico-Axial Multiphase Pump (HAMP). Energies, 15(21), 8149. https://doi.org/10.3390/en15218149