Numerical Analysis on the Hydraulic Thrust and Dynamic Response Characteristics of a Turbine Pump
Abstract
:1. Introduction
2. Objective and Methods
2.1. Turbine Pump Flow Model
2.2. CFD Simulation Theory and Setup
2.3. Shafting FEM Model and Setup
3. Results and Discussion
3.1. Hydraulic Performance
3.2. Pressure Pulsation Characteristics
3.3. Hydraulic Thrust
3.4. Dynamic Response of the Shafting
4. Conclusions
- (a)
- The hydraulic performance calculated by the CFD shows good agreement with the designed parameters; the pressure distribution in the flow passage is symmetrically distributed and gradually decreases from the spiral casing to the draft tube, and the pressure distribution on the runner surface is stable in one rotating circle.
- (b)
- The streamline is smooth in the whole flow passage with one vortex rope in the draft tube. The pressure fluctuation of the runner reaches 16% of the head, which is greater than other flow passages. The typical dominant frequencies are found in the runner and the guide vane; the guide vane passing frequency in the runner and the runner blade frequency in the guide vane.
- (c)
- The radial hydraulic thrust is much smaller than the axial hydraulic thrust. The axial hydraulic thrust fluctuates from about 155 t to 175 t, and the dominant frequency is only 0.4. The unit has the risk of resonance caused by axial hydraulic thrust in the start-up and shutdown processes. The radial hydraulic thrust fluctuates from about 2 t to 13 t.
- (d)
- The runner has asymmetrical deformation in the axial and radial direction. The maximum stress on the shafting is about 73 MPa, the amplitude of the dynamic stress on the shafting is about 10 MPa, and the dominant frequency of the dynamic stress on the runner is 20.
Author Contributions
Funding
Institutional Review Board statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Component | Element Type | Element Number |
---|---|---|
Spiral casing | Hexahedral | 72,588 |
Stay vanes | Hexahedral | 579,660 |
Guide vanes | Hexahedral | 434,160 |
Runner | Hybrid | 2,086,433 |
Crown gap and band gap | Hexahedral | 753,330 |
Pressure balance pipe | Hexahedral | 295,652 |
Draft tube | Hybrid | 1,162,188 |
Total | - | 5,384,011 |
Item | Head (m) | Discharge (m3/s) | Power (MW) |
---|---|---|---|
Simulation | 429.60 | 78.27 | 297.80 |
Designed Parameter | 430.00 | 79.16 | 306.10 |
Error (%) | −0.09% | −1.12% | −2.71% |
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Kong, L.; Cao, J.; Li, X.; Zhou, X.; Hu, H.; Wang, T.; Gui, S.; Lai, W.; Zhu, Z.; Wang, Z.; et al. Numerical Analysis on the Hydraulic Thrust and Dynamic Response Characteristics of a Turbine Pump. Energies 2022, 15, 1580. https://doi.org/10.3390/en15041580
Kong L, Cao J, Li X, Zhou X, Hu H, Wang T, Gui S, Lai W, Zhu Z, Wang Z, et al. Numerical Analysis on the Hydraulic Thrust and Dynamic Response Characteristics of a Turbine Pump. Energies. 2022; 15(4):1580. https://doi.org/10.3390/en15041580
Chicago/Turabian StyleKong, Linghua, Jingwei Cao, Xiangyang Li, Xulei Zhou, Haihong Hu, Tao Wang, Shuxin Gui, Wenfa Lai, Zhongfeng Zhu, Zhengwei Wang, and et al. 2022. "Numerical Analysis on the Hydraulic Thrust and Dynamic Response Characteristics of a Turbine Pump" Energies 15, no. 4: 1580. https://doi.org/10.3390/en15041580