Analysis of water surface line in free-surface-pressurized flow section of tailwater tunnel of large hydropower station

Gaohui Li; Fei Yang; Shaojia Yang; Zhida Zhang

doi:10.1117/12.2656001

20 October 2022 Analysis of water surface line in free-surface-pressurized flow section of tailwater tunnel of large hydropower station

Gaohui Li, Fei Yang, Shaojia Yang, Zhida Zhang

Author Affiliations +

Proceedings Volume 12451, 5th International Conference on Computer Information Science and Application Technology (CISAT 2022); 124510X (2022) https://doi.org/10.1117/12.2656001
Event: 5th International Conference on Computer Information Science and Application Technology (CISAT 2022), 2022, Chongqing, China

Abstract

In the transition process of tailrace system of large hydropower station, there may be the phenomenon of free-surfacepressurized flow. In order to obtain the accurate operating state of constant flow in the free-surface-pressurized flow section, four calculation methods including Runge Kutta method, one-dimensional numerical simulation software, physical model test and three-dimensional flow field analysis software CFD are used to obtain the water surface profile under constant flow conditions. The results show that the calculation results of each method are relatively consistent, indicating that the research method and route are correct and reasonable. The established mathematical model is reasonable and can be used to study the hydrodynamics of free-surface-pressurized flow. Considering the difference between the outlet of tailrace tunnel and one-dimensional simulation method obtained from physical model test and three-dimensional flow field analysis, the water surface lines of the free-surface-pressurized flow section of tailrace tunnel under constant flow conditions obtained by various analysis methods are basically coincident. The analysis of the local flow field at the outlet of the tailrace tunnel shows that it is feasible to use the three-dimensional flow field simulation instead of the physical model test to simulate the more complex working conditions. The research results can provide reference for the design and research of similar water conveyance systems.

Citation Download Citation

Gaohui Li, Fei Yang, Shaojia Yang, and Zhida Zhang "Analysis of water surface line in free-surface-pressurized flow section of tailwater tunnel of large hydropower station", Proc. SPIE 12451, 5th International Conference on Computer Information Science and Application Technology (CISAT 2022), 124510X (20 October 2022); https://doi.org/10.1117/12.2656001

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KEYWORDS

3D modeling

Mathematical modeling

Numerical simulations

Computer simulations

Analytical research

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