Numerical Study on the Internal Flow Field of a Reversible Turbine during Continuous Guide Vane Closing

Xiuli Mao, Andrea Dal Monte, Ernesto Benini and Yuan Zheng
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Xiuli Mao: College of Water Conservancy and Hydropower Engineering, Hohai University, Xikang Road 1, Nanjing 210098, China
Andrea Dal Monte: Department of Industrial Engineering, University of Padua, Via Venezia 1, Padua I-35131, Italy
Ernesto Benini: Department of Industrial Engineering, University of Padua, Via Venezia 1, Padua I-35131, Italy
Yuan Zheng: College of Water Conservancy and Hydropower Engineering, Hohai University, Xikang Road 1, Nanjing 210098, China

Energies, 2017, vol. 10, issue 7, 1-22

Abstract: The unsteady flow field in a reversible pump-turbine is investigated during the continuous load rejection using a 3D computational fluid dynamic analysis. Numerical calculations are carried out using the detached eddy simulation (DES) turbulence model and a new approach involving automatic mesh motion. In this way, the instability of the flow field is analyzed by continuously changing the guide vane openings from the best efficiency point (BEP). Unsteady flow characteristics are described by post-processing signals for several monitoring points including mass flow, torque, head and pressure in the frequency and time-frequency domains. The formation of vortices of different scales is observed from the origin to further enlargement and stabilization; the effect of the rotating structures on the flow passage is analyzed, and the influence of unsteady flow development on the performance of the turbine is investigated. Finally, the evolution during the period of load rejection is characterized in order to determine the hydrodynamic conditions causing the vibrations in the machine.

Keywords: reversible turbine; unsteady flow; load rejection; dynamic mesh; guide vane closing law (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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