Lateral vibration of hydro turbine-generator rotor with varying stiffness of guide bearings

Lai, Xide; Liao, Gaohua; Zhu, Yi; Zhang, X; Gou, Qiuqin; Zhang, W B

doi:10.1088/1755-1315/15/4/042006

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…A 3D numerical model was built [157] for the prediction of the vortex rope in the draft tube of a Francis turbine unit based on two numerical flow analyses (with and without the effects of cavitation). Similarly, the cavitation turbulent flow under partial load operation was numerically studied in a Francis turbine using the k-ω (k-omega model which predicts well near boundaries) shear stress transport turbulence model in the Reynolds-averaged Navier-Stokes equations [22]. Qian et al [158] simulated 3D multiphase flows to estimate the pulsation pressure in the runner front, draft tube, guide vanes, and spiral casing using fast Fourier transform of a Francis turbine.…”

Section: Francis Turbine Modelingmentioning

confidence: 99%

“…Mechanical engineers have examined the effect of vibration generated from the hydraulic turbines to determine their performance through the operational process and their hydraulic performance due to the operation of the powerhouse. Other studies [20][21][22] investigated and modeled the circulation of pressure in the turbine draft tube. A need remains to evaluate the influence of powerhouse-operation-related vibrational effects on the dam body; such studies must consider the dam, turbine, and powerhouse types.…”

Section: Introductionmentioning

confidence: 99%

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State-of-the Art-Powerhouse, Dam Structure, and Turbine Operation and Vibrations

Yaseen‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

Ameen

Aldlemy

et al. 2020

Sustainability

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Dam and powerhouse operation sustainability is a major concern from the hydraulic engineering perspective. Powerhouse operation is one of the main sources of vibrations in the dam structure and hydropower plant; thus, the evaluation of turbine performance at different water pressures is important for determining the sustainability of the dam body. Draft tube turbines run under high pressure and suffer from connection problems, such as vibrations and pressure fluctuation. Reducing the pressure fluctuation and minimizing the principal stress caused by undesired components of water in the draft tube turbine are ongoing problems that must be resolved. Here, we conducted a comprehensive review of studies performed on dams, powerhouses, and turbine vibration, focusing on the vibration of two turbine units: Kaplan and Francis turbine units. The survey covered several aspects of dam types (e.g., rock and concrete dams), powerhouse analysis, turbine vibrations, and the relationship between dam and hydropower plant sustainability and operation. The current review covers the related research on the fluid mechanism in turbine units of hydropower plants, providing a perspective on better control of vibrations. Thus, the risks and failures can be better managed and reduced, which in turn will reduce hydropower plant operation costs and simultaneously increase the economical sustainability. Several research gaps were found, and the literature was assessed to provide more insightful details on the studies surveyed. Numerous future research directions are recommended.

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Section: Francis Turbine Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

State-of-the Art-Powerhouse, Dam Structure, and Turbine Operation and Vibrations

Yaseen‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

Ameen

Aldlemy

et al. 2020

Sustainability

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“…Jošt and Lipej built a three-dimensional (3D) numerical model for a Francis turbine unit to predict the vortex rope in the draft tube based on numerical flow analyses by performing two analyses, both with and without cavitation effects [8]. Another study reported a numerical analysis of the cavitation turbulent flow in a Francis turbine under partial load operation using the k-ω shear stress transport turbulence model in the Reynolds-averaged Navier-Stokes equations [9]. Qian et al simulated 3D multiphase flows in a Francis turbine to calculate pressure pulsation in the spiral casing, draft tube, runner front, and guide vanes using fast Fourier transform [10].…”

Section: Vibrations Of Turbines and Powerhousesmentioning

confidence: 99%

Minimizing the Principle Stresses of Powerhoused Rock-Fill Dams Using Control Turbine Running Units: Application of Finite Element Method

Ameen

Ibrahim

Othman

et al. 2018

Water

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This study focuses on improving the safety of embankment dams by considering the effects of vibration due to powerhouse operation on the dam body. The study contains two main parts. In the first part, ANSYS-CFX is used to create the three-dimensional (3D) Finite Volume (FV) model of one vertical Francis turbine unit. The 3D model is run by considering various reservoir conditions and the dimensions of units. The Re-Normalization Group (RNG) k-ε turbulence model is employed, and the physical properties of water and the flow characteristics are defined in the turbine model. In the second phases, a 3D finite element (FE) numerical model for a rock-fill dam is created by using ANSYS®, considering the dam connection with its powerhouse represented by four vertical Francis turbines, foundation, and the upstream reservoir. Changing the upstream water table minimum and maximum water levels, standers earth gravity, fluid-solid interface, hydrostatic pressure, and the soil properties are considered. The dam model runs to cover all possibilities for turbines operating in accordance with the reservoir discharge ranges. In order to minimize stresses in the dam body and increase dam safety, this study optimizes the turbine operating system by integrating turbine and dam models.

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“…The modeling of hydraulic power machinery is researched extensively, [10,13]. The special attention is addressed to the bearings, [14][15][16] and unbalanced magnetic pull, [11,12,17].…”

Section: Hydro-power Machine Modelmentioning

confidence: 99%

An Identification of the unbalanced magnetic pull in generator at excitation and the hydropower machine model validation

2018

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A mechanical vibration inverse analysis has been performed on 150MW hydro-power machine in order to identify unbalanced magnetic pull. FEM model of the machine is developed according to design data. The System Equivalent Reduction Expansion Process is involved in model validation during the power-machine experimental run. The unbalanced magnetic pull in the generator is calculated from the verified model and monitored data.

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Lateral vibration of hydro turbine-generator rotor with varying stiffness of guide bearings

Cited by 6 publications

References 4 publications

State-of-the Art-Powerhouse, Dam Structure, and Turbine Operation and Vibrations

State-of-the Art-Powerhouse, Dam Structure, and Turbine Operation and Vibrations

Minimizing the Principle Stresses of Powerhoused Rock-Fill Dams Using Control Turbine Running Units: Application of Finite Element Method

An Identification of the unbalanced magnetic pull in generator at excitation and the hydropower machine model validation

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