Hydraulic Transient Simulation of Pipeline-Open Channel Coupling Systems and Its Applications in Hydropower Stations
Abstract
:1. Introduction
2. Mathematical Model and Verifications
2.1. Transient Modelling of Pipeline Flow
2.2. Modelling of Open Channel Flow
2.3. Boundary Condition Based on Riemann Invariants
2.4. The Simulation Process
3. Numerical Validations
4. Transient Simulation of a Hydropower Station with a Sand Basin
4.1. System Configuration and Modelling
4.2. Full Load-Rejection
4.2.1. Simulation Results
4.2.2. Comparison with the Results by Modelling the Basin Tank as a Surge Tank
4.3. 5% Load-Rejection with Frequency Regulation
4.3.1. Simulation Results
4.3.2. Comparison with the Results by Modelling the Basin Tank as a Surge Tank
5. Conclusions
- The MOC-FVM coupling method can accurately simulate the pipeline-open channel coupling transient flow with the simulated parameters transmitted successfully at the coupling boundaries.
- The coupling method has been successfully applied to a hydropower station with a sand basin constructed between the upstream reservoir and turbines. The sand basin can be modelled as an open channel.
- The effects of the sand basin on the transient process are similar to a surge tank which can relieve water hammer pressures during load rejection scenarios and can benefit the frequency regulation process. By modelling the sand basin as an open channel, the flow velocity and the friction in the horizontal direction, which are neglected when modelling the sand basin as a surge tank, can be considered, and thus more reliable and accurate results can be obtained.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Runner Inlet Diameter (m) | Guide Vane Height (m) | Upstream Water Level (m) | Downstream Water Level (m) | Rated Rotational Speed (rpm) | Rated Output (Mw) | Rated Flow Rate (m3/s) | Rotational Inertia (t.m2) |
---|---|---|---|---|---|---|---|
2.3 | 0.7 | 1073 | 829 | 429.6 | 10.54 | 29 | 726 |
Temporary Droop | Differential Time Constant | Time Lag in Servomotor | Dashpot Time Constant |
---|---|---|---|
0.3 | 0.3 s | 0.05 s | 5.0 s |
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Zeng, W.; Wang, C.; Yang, J. Hydraulic Transient Simulation of Pipeline-Open Channel Coupling Systems and Its Applications in Hydropower Stations. Water 2022, 14, 2897. https://doi.org/10.3390/w14182897
Zeng W, Wang C, Yang J. Hydraulic Transient Simulation of Pipeline-Open Channel Coupling Systems and Its Applications in Hydropower Stations. Water. 2022; 14(18):2897. https://doi.org/10.3390/w14182897
Chicago/Turabian StyleZeng, Wei, Chao Wang, and Jiandong Yang. 2022. "Hydraulic Transient Simulation of Pipeline-Open Channel Coupling Systems and Its Applications in Hydropower Stations" Water 14, no. 18: 2897. https://doi.org/10.3390/w14182897