Analysis of Pressure Pulsation and Structural Characteristics of Vertical Shaft Cross-Flow Pumps
Abstract
:1. Introduction
2. Numerical Simulation
2.1. Numerical Simulation Model
2.2. Mesh Sectioning
2.3. Boundary Condition Settings
2.4. SST Turbulence Model
2.5. Fluid–Structure Coupling Settings
3. Description of the Experimental Device
3.1. Model Experimental Setup
3.2. Comparison of Simulations and Experimental Results
4. Results and Discussion
4.1. Pressure Pulsation Characteristics
4.1.1. Layout of Pressure Pulsation Measurement Points
4.1.2. Time–Frequency Characteristics
- p—instantaneous pressure, Pa;
- —time-averaged pressure, Pa;
- —water density, kg/m3;
- u—impeller circumferential speed, m/s.
Pressure Pulsation Characteristics of the Inlet Passage
Pressure Pulsation Characteristics of the Impeller
Pressure Pulsation Characteristics of the Guide Vane
4.2. Analysis of Structural Characteristics of Pump Equipment
4.2.1. Stress and Strain Analysis of Impeller Blades
4.2.2. Stress and Strain Analysis of Guide Vane Blades
5. Conclusions
- (1)
- At the inlet position, due to the limited impact of impeller rotation on the inlet, the pressure fluctuation amplitude is relatively weak. The main frequency at the inlet of the impeller is three times the rotational frequency, indicating that the water body is affected by the rotation of the impeller before passing through it. The main frequency at the outlet of the impeller is six times the rotational frequency, indicating a significant impact of rotor–stator interaction on the water body.
- (2)
- The time-domain data of the pressure fluctuation at the outlet of the guide vane show three different peaks and valleys within one cycle. It is worth noting that the amplitude of the pressure fluctuation curve significantly decreases towards the cross-section of the impeller outlet. Each monitoring point shows a significant high amplitude distribution at three times the rotational frequency and six times the position, indicating that both the impeller blades and guide blades are affected simultaneously.
- (3)
- The high stress area appears at the root of the impeller, and the stress magnitude decreases in the circumferential direction towards the edge of the impeller. The stress level at the edge of the impeller is relatively moderate. The stress distribution at the root of the impeller is uneven, and the stress at the outlet edge exceeds that at the inlet edge. The non-uniformity of the stress distribution gradually decreases with the increase in the radial distance.
- (4)
- The high stress and strain areas on the front of the guide vanes are concentrated in the root area near the outlet, and the stress distribution inside the guide vanes is uneven. At the root, there is significant stress on both sides, but the internal stress is the smallest. As the radial distance increases, the stress inside the blade becomes more uniform and the stress magnitude decreases.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
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Zhu, Y.; Jiao, H.; Wang, S.; Zhu, W.; Wang, M.; Chen, S. Analysis of Pressure Pulsation and Structural Characteristics of Vertical Shaft Cross-Flow Pumps. Water 2024, 16, 324. https://doi.org/10.3390/w16020324
Zhu Y, Jiao H, Wang S, Zhu W, Wang M, Chen S. Analysis of Pressure Pulsation and Structural Characteristics of Vertical Shaft Cross-Flow Pumps. Water. 2024; 16(2):324. https://doi.org/10.3390/w16020324
Chicago/Turabian StyleZhu, Yadong, Haifeng Jiao, Shihui Wang, Wenbo Zhu, Mengcheng Wang, and Songshan Chen. 2024. "Analysis of Pressure Pulsation and Structural Characteristics of Vertical Shaft Cross-Flow Pumps" Water 16, no. 2: 324. https://doi.org/10.3390/w16020324