Next Article in Journal
State-of-Charge Estimation with State-of-Health Calibration for Lithium-Ion Batteries
Previous Article in Journal
Exergy Replacement Cost of Fossil Fuels: Closing the Carbon Cycle
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessFeature PaperArticle
Energies 2017, 10(7), 988; https://doi.org/10.3390/en10070988

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

1
College of Water Conservancy and Hydropower Engineering, Hohai University, Xikang Road 1, Nanjing 210098, China
2
Department of Industrial Engineering, University of Padua, Via Venezia 1, Padua I-35131, Italy
3
National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Xikang Road 1, Nanjing 210098, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Antonio Calvo Hernández
Received: 5 June 2017 / Revised: 30 June 2017 / Accepted: 4 July 2017 / Published: 13 July 2017
(This article belongs to the Section Energy Storage and Application)

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. View Full-Text
Keywords: reversible turbine; unsteady flow; load rejection; dynamic mesh; guide vane closing law reversible turbine; unsteady flow; load rejection; dynamic mesh; guide vane closing law
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Mao, X.; Dal Monte, A.; Benini, E.; Zheng, Y. Numerical Study on the Internal Flow Field of a Reversible Turbine during Continuous Guide Vane Closing. Energies 2017, 10, 988.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top