Three-dimensional flow simulation of transient power interruption process of a prototype pump-turbine at pump mode

The transient power failure process of a prototype pump-turbine was studied numerically by three-dimensional (3-D) simulations. Fluid coupling and dynamic mesh (DM) method were used to calculate the rotational speed of the runner. Simulations were performed based on turbulence model. Specific transi...

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Bibliographic Details
Published in:Journal of mechanical science and technology 2013, 27(5), , pp.1305-1312
Main Authors: Liu, Jintao, Liu, Shuhong, Sun, Yuekun, Jiao, Lei, Wu, Yulin, Wang, Leqin
Format: Article
Language:English
Subjects:
Braking
Computer simulation
Control
Dynamical Systems
Engineering
Flow rate
Industrial and Production Engineering
Mathematical models
Mechanical Engineering
Prototypes
Pumps
Rotational
Three dimensional
Vibration
기계공학
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Summary:The transient power failure process of a prototype pump-turbine was studied numerically by three-dimensional (3-D) simulations. Fluid coupling and dynamic mesh (DM) method were used to calculate the rotational speed of the runner. Simulations were performed based on turbulence model. Specific transient characteristics, such as the flow rate, head, rotational speed, were analyzed. The pumpturbine had a minimum head and a maximum axial force when the flow rate was 0 during the transient process. Pressure fluctuations increased when the pump-turbine ran at pump braking mode. Reverse flow in the casing as well as stall phenomenon in the runner had a great effect on the change of head. Pressure in the runner was greatly reduced when the pump-turbine ran at pump braking mode. The computational method could be used to interpret the abnormal phenomenon by the analysis of flow mechanism during a transient process.
ISSN:1738-494X
1976-3824
DOI:10.1007/s12206-013-0313-6