Abstract
It is of great significance for the practical operation scheduling to comprehensively analyze the influencing factors of the long-term steady-state operation state of different water demand scenarios and the coupled operation of hydraulic facilities when switching demand scenario as the demand changes. In the study, a case study is performed in the Daxing Branch project, the numerical model of which considered pipelines, pumps, valves, air valves, and regulating tanks is established using Method of Characteristics. The hydraulic responses and corresponding flow regulation of different demand scenarios and between changing demand scenarios are analyzed. The results show that steady-state working conditions can have important impacts on the transient process. Energy consumption and the amount of water transfer, as well as water hammer pressure and the allowable reaction time during the transient process should be taken into account in the selection of long-term steady-state working conditions of different demand scenarios. The sequence and maximum allowable time interval of the coupled operation of pumps and valves should be considered when switching demand scenario. Finally, the optimal steady-state working conditions of different demand scenarios, the coupled operation sequence of pumps and valves, the maximum allowable time interval of the Daxing Branch project are proposed, which can provide some insights into the safe operation of the project and other similar complex water transfer projects.
Highlights
A number of water-transfer projects have been constructed in China to allow continued development in arid and semi-arid regions that would otherwise have been constrained by natural limits
The results show that the regulation sequence appears to have no significant effects on the water hammer pressure, but it can substantially affect the water level of the regulating tank
In order to guarantee the operation of the different demands, the design operating ranges of
Summary
A number of water-transfer projects have been constructed in China to allow continued development in arid and semi-arid regions that would otherwise have been constrained by natural limits. A pressure wave of 1000 m/s or higher can be generated in a transient event and propagated along the steel pipeline, often causing loud noises, severe vibration, and damage [2], such as pipeline rupture, collapse, water leakage, cavitation, and erosion [3,4]. It should be taken into account in the design and operation of a water transfer project. Many numerical approaches have been developed to simulate transient flow in
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