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Journal of Applied Fluid Mechanics، جلد ۱۸، شماره ۱۲، صفحات ۲۹۶۸-۲۹۸۷
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عنوان انگلیسی Rotating Stall Characteristics in the Hump Region of a Pump Turbine: Application of Modal Decomposition
چکیده انگلیسی مقاله A reversible pump turbine is a large-scale commercial energy storage device that serves as the core component of a pumped storage power station. Under pump operating conditions, the reversible pump turbine often exhibits hump characteristics on the head–discharge performance curve, leading to operational instability and limiting both regulation performance and safety. However, the mechanism underlying flow instability in the hump region is not adequately understood. Existing analysis methods are limited in scope, and they struggle to identify key flow structures accurately in application. In this study, large eddy simulation (LES) is used to investigate unsteady flow characteristics under typical hump conditions. Proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) methods are applied to a transient flow field to extract dominant modal structures and analyze their dynamic behaviors. The results show that rotating stalls in the guide vane and runner regions are the primary factors creating hump characteristics. Both the POD and DMD methods effectively capture major vortex structures and their changes, demonstrating their suitability for analyzing complex flow dynamics. These findings provide theoretical insight into the flow instability mechanism in the hump region and offer guidance for improving the operational performance of pump turbines.
کلیدواژه‌های انگلیسی مقاله Pump-turbine,Numerical simulation,Complex flow field,Rotating stall,Modal decomposition
نویسندگان مقاله Y. H. Zhang |
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

J. L. Wang |
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

W. T. Su |
School of Petroleum and Natural Gas Engineering, Liaoning Petrochemical University, Fushun Liaoning 113001, China

Y. Zhao |
Harbin Electric Machinery Company Limited, Harbin 150040, China

Y. L. Chen |
Harbin Electric Machinery Company Limited, Harbin 150040, China

T. P. Chen |
Harbin Electric Machinery Company Limited, Harbin 150040, China

A. R. P. Yusrizal |
Faculty of Mechanical and Automotive Engineering Technology, Universiti Malaysia Pahang As-Sultan Abdullah (UMPSA), Malaysia

نشانی اینترنتی https://www.jafmonline.net/article_2760_26b3f93c3de193307c9879b5da7a5b86.pdf
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