An experimental study of dependence of hydro turbine vibration parameters on pressure pulsations in the flow path

Dekterev, Dmitry; Maslennikova, Aleksandra V.; Abramov, Artem

doi:10.1088/1742-6596/899/2/022003

Cited by 2 publications

(1 citation statement)

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“…Lu Lei and others applied numerical simulation methods to analyze the intense vibrations and noise emitted by turbines under full and overload conditions, concluding that the hydraulic instability at the station was caused by blade passage vortices in the turbine [14]. Dekterev et al further investigated the evolution of vortex cores in turbine blade passages based on hydrodynamic models of hydraulic units [15]. Luo Xingqi and others summarized that the root cause of turbine vibrations lies in the vortex structures of unsteady flows within the turbine, which can lead to large pressure fluctuations, significant unit vibrations, and fatigue of turbine components [16].…”

Section: Introductionmentioning

confidence: 99%

Testing and Numerical Analysis of Abnormal Pressure Pulsations in Francis Turbines

Jia,

Zeng,

Liu

et al. 2024

Energies

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During the flood season, Francis turbines often operate under low-head and full-load conditions, frequently experiencing significant pressure pulsations, posing potential threats to the safe and stable operation of the units. However, the factors contributing to substantial pressure pulsations in Francis turbines are multifaceted. This paper focuses on a mixed-flow hydroelectric generating unit at a specific hydropower station. Field tests were conducted to investigate abnormal vibrations and hydraulic pressure pulsations under low-head and full-load conditions. Utilizing the Navier–Stokes equations and the RNG k-ε turbulence model, the unsteady flow field within the turbine under these conditions was calculated. The results indicate that the abnormal pressure pulsations detected in the bladeless zone between the wicket gates and the turbine inlet are due to operational points deviating from the normal operating range of the turbine. When water flows at a large inflow angle, striking the turbine blade heads, it leads to significant flow separation and vortex formation at the back of the blade inlet edges, causing severe vibrations in the hydroelectric generating unit. These findings provide a basis and assurance for the safe and stable operation of the power station.

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Section: Introductionmentioning

confidence: 99%