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Article

Transient Process of Pumped Storage System Coupling Gas–Liquid Interface: Novel Mathematical Model and Experimental Verification

1
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
2
Power China Zhongnan Engineering Corporation Limited, Changsha 410014, China
*
Author to whom correspondence should be addressed.
Academic Editor: Helena M. Ramos
Water 2021, 13(20), 2933; https://doi.org/10.3390/w13202933
Received: 23 September 2021 / Revised: 16 October 2021 / Accepted: 17 October 2021 / Published: 19 October 2021
(This article belongs to the Section Hydrogeology)
The traditional calculation method for a transient process has high accuracy when the pipeline only contains liquid, but when the pipeline contains both gas and liquid the accuracy is greatly reduced. The coupling characteristics of gas–liquid interface movement in hydraulic transient processes are not clear due to the lack of high-precision mathematical model and experimental verification. This paper proposes a novel mathematical model of a gas–liquid pipeline system in a hydropower station based on Preissman’s implicit difference scheme and the method of characteristics. The solving mechanism of the transient process of gas–liquid movement was developed on the gas–liquid interface tracking method. Subsequently, the models proposed in this paper were applied in two typical scenarios of a gas–liquid transient process in a hydropower system, and their accuracy were verified in a field experiment. The comparison results showed that the novel model could accurately capture the movement of the gas–liquid interface, and the average relative error of the characteristic parameter was about 7.2%. Under the load rejection condition, the change speed of characteristic parameters was positively correlated with the pipeline slope. Under the pump failure after low-head startup condition, the maximum pumping discharge was negatively correlated with startup water level and the maximum reversal discharge and speed were positively correlated with the pump failure water level. Compared with the conventional method, the proposed model has advantages in solving the complex transient process coupling gas–liquid. It has potential value in applications such as the safe operation of hydropower stations, the transient process of water diversion projects and in urban pipe network operation. View Full-Text
Keywords: implicit difference scheme; method of characteristics; gas–liquid coupling interface; hydraulic transient process; quitting runaway operations; pump failure condition implicit difference scheme; method of characteristics; gas–liquid coupling interface; hydraulic transient process; quitting runaway operations; pump failure condition
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MDPI and ACS Style

Liu, C.; Peng, T.; Yang, J.; Zhao, Z.; Yang, J. Transient Process of Pumped Storage System Coupling Gas–Liquid Interface: Novel Mathematical Model and Experimental Verification. Water 2021, 13, 2933. https://doi.org/10.3390/w13202933

AMA Style

Liu C, Peng T, Yang J, Zhao Z, Yang J. Transient Process of Pumped Storage System Coupling Gas–Liquid Interface: Novel Mathematical Model and Experimental Verification. Water. 2021; 13(20):2933. https://doi.org/10.3390/w13202933

Chicago/Turabian Style

Liu, Chengpeng, Tao Peng, Jiebin Yang, Zhigao Zhao, and Jiandong Yang. 2021. "Transient Process of Pumped Storage System Coupling Gas–Liquid Interface: Novel Mathematical Model and Experimental Verification" Water 13, no. 20: 2933. https://doi.org/10.3390/w13202933

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