首页|Flow excitation mechanisms of unbalanced impeller forces after pump power-trip of ultra-high head pump-turbines

Flow excitation mechanisms of unbalanced impeller forces after pump power-trip of ultra-high head pump-turbines

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To elucidate the dynamic mechanisms of unbalanced impellers in ultra-high head pump-turbines(PTs),this study employed a one-and three-dimensional coupled method to simulate the pump power-trip(PPT)process of an ultra-high head PT.The investigation revealed two novel pulsation frequency components,denoted asfDV and fINFT,associated with impeller forces.The pulsation intensities of these components were markedly higher than those of rotor-stator interaction frequency components in ultra-high head PTs.Notably,the fDV components exhibited pulsations at 1-2 times the rated rotation frequency of the impeller,spanning the entire transition period.Meanwhile,the fINFT components constituted a complex frequency band with various frequency values,primarily occurring near conditions(Q=0,n=0,M=0,and dM/dt=0).These two pulsation frequency components were predominantly linked to the unsteady evolution of dean vortices inside the volute and complex transitions of the flow pattern within the impeller,respectively.It is crucial to note that these unbalanced flow-induced impeller axial forces can elevate the risk of accidents where the rotor is subjected to significant upwind axial forces.These findings offer valuable insights into mitigating the risk of rotor lifting due to axial forces during PT events in ultra-high head PTs.

ultra-high head pump-turbinepump power-tripunbalanced impeller forcespressure pulsationsflow pattern transi-tions

FU XiaoLong、LI DeYou、LV JingWei、YANG Biao、WANG HongJie、WEI XianZhu

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School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China

State Key Laboratory of Hydro-Power Equipment,Harbin Institute of Large Electrical Machinery,Harbin 150040,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaSichuan Science and Technology ProgramChina Postdoctoral Science FoundationChina Postdoctoral Science FoundationNatural Science Foundation of Heilongjiang Province,China

52079034522091082023YFQ00212022M7209482023T160162HL2023E058

2024

10.1007/s11431-023-2542-2

中国科学:技术科学(英文版)
中国科学院

中国科学:技术科学(英文版)

CSTPCDEI
影响因子：1.056
ISSN：1674-7321
年,卷(期)：2024.67(5)