Numerical and Experimental Investigation of the Ultra-Low Head Bidirectional Shaft Extension Pump Under Near-Zero Head Conditions
Abstract
1. Introduction
2. Numerical Simulation and Experimental Setup
2.1. Governing Equations and Cavitation Model
2.2. Computational Domain, Mesh, and Numerical Setup
2.3. Experimental Setup
2.4. Validation
3. Results and Discussion
3.1. Flow Field in the Entire Domain
3.2. Flow Field Inside the Impeller and Guide Vane
3.3. Hydraulic Loss of Flow Passages
3.4. FSI
3.5. Cavitation
3.6. Pressure Fluctuation
3.7. Vibration
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
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Nodes | Elements | Maximum Stress (MPa) |
---|---|---|
1,328,790 | 408,440 | 21.314 |
799,963 | 251,839 | 20.947 |
447,851 | 144,995 | 20.118 |
316,158 | 107,761 | 18.837 |
247,435 | 83,375 | 17.364 |
Direction | Q/Q0 | X Direction | Y Direction | Z Direction | |||
---|---|---|---|---|---|---|---|
PTP Values | PF | PTP Values | PF | PTP Values | PF | ||
Forward operation | 1.20 | 0.742 | 3 | 0.732 | 3 | 1.665 | 3 |
1.16 | 0.757 | 15 | 0.566 | 3 | 1.514 | 15 | |
1.10 | 0.723 | 9 | 0.625 | 4 | 1.870 | 4 | |
0.90 | 0.796 | 3 | 0.830 | 3 | 1.963 | 3 | |
Reverse operation | 1.20 | 0.645 | 3 | 0.615 | 3 | 1.533 | 3 |
1.05 | 0.474 | 3 | 0.513 | 3 | 1.230 | 4 | |
0.97 | 0.547 | 3 | 0.581 | 4 | 1.475 | 1 | |
0.73 | 0.947 | 1 | 1.104 | 1 | 2.891 | / |
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Zhang, F.; Zheng, Y.; Li, G.; Dai, J. Numerical and Experimental Investigation of the Ultra-Low Head Bidirectional Shaft Extension Pump Under Near-Zero Head Conditions. Machines 2025, 13, 220. https://doi.org/10.3390/machines13030220
Zhang F, Zheng Y, Li G, Dai J. Numerical and Experimental Investigation of the Ultra-Low Head Bidirectional Shaft Extension Pump Under Near-Zero Head Conditions. Machines. 2025; 13(3):220. https://doi.org/10.3390/machines13030220
Chicago/Turabian StyleZhang, Fulin, Yuan Zheng, Gaohui Li, and Jing Dai. 2025. "Numerical and Experimental Investigation of the Ultra-Low Head Bidirectional Shaft Extension Pump Under Near-Zero Head Conditions" Machines 13, no. 3: 220. https://doi.org/10.3390/machines13030220
APA StyleZhang, F., Zheng, Y., Li, G., & Dai, J. (2025). Numerical and Experimental Investigation of the Ultra-Low Head Bidirectional Shaft Extension Pump Under Near-Zero Head Conditions. Machines, 13(3), 220. https://doi.org/10.3390/machines13030220