Three-dimensional evolution of the flow unsteadiness in the S-shape of pump-turbines and its correlation with the runner geometry

Zanetti, Giacomo; Cavazzini, Giovanna; Santolin, Alberto

doi:10.1016/j.est.2022.106176

Cited by 6 publications

(2 citation statements)

References 19 publications

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“…Since this paper does not focus on secondary flows, a detailed description of all the possible secondary flows is avoided. Detailed information on secondary flows occurring in Francis turbines and in reversible pump turbines operating at off-design conditions can be found in references [54][55][56][57] In this scenario, IDM adoption could limit the development of the interblade vortexes by modifying the flow incidence condition. Moreover, the control of the static pressure distribution represents an effective method for the suppression of cavitation phenomena without compromising the hydraulic efficiency.…”

Section: The Idm and The Suppression Of Secondary Flowsmentioning

confidence: 99%

Application of the 3D Inverse Design Method in Reversible Pump Turbines and Francis Turbines

Zanetti

Siviero

Cavazzini

et al. 2023

Water

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The increasingly stringent requirements in terms of flexibility and efficiency for hydraulic turbines pose new challenges for designers. Although computational fluid dynamics has offered new opportunities to significantly improve the performance in the preliminary design phase, the design of a hydraulic turbine still represents a challenging task requiring considerable engineering input and know-how. In such a scenario, the inverse three-dimensional design strategy has recently demonstrated its effectiveness in improving the machine performance, and interesting applications have been proposed for Francis turbines and reversible pump turbines. This paper presents and discusses the most interesting design solutions so far documented. The influence of blade staking and load distribution on the hydrodynamic performance is discussed. Finally, optimized blade load distributions are reported to provide useful design guidelines for the development of the new generation of hydraulic turbines.

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Section: The Idm and The Suppression Of Secondary Flowsmentioning

confidence: 99%

Application of the 3D Inverse Design Method in Reversible Pump Turbines and Francis Turbines

Zanetti

Siviero

Cavazzini

et al. 2023

Water

Self Cite

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“…In fact, as reported by Neumann et al [4], the SAS turbulent model has been proven to give good accuracy in frequency prediction, and it results in more realistic force amplitudes compared with other two-equation turbulence models such as the SST. Moreover, such an approach has been successfully adopted for the evaluation of the tridimensional behavior of the fluid flow in hydraulic turbines [12]. Indeed, the SAS model allows the turbulent model to be adapted to the local-turbulence length scale by switching from the LES model in the unsteady flow regions to the RANS, in this case, the SST model, in the steady ones.…”

Section: Simulation Settingsmentioning

confidence: 99%

Effect of the von Karman Shedding Frequency on the Hydrodynamics of a Francis Turbine Operating at Nominal Load

Zanetti

Cavazzini

Santolin

2023

IJTPP

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This paper presents a numerical analysis of the influence of the von Karman vortex shedding at the blade trailing edge on the hydrodynamics of a recently installed small hydro Francis turbine manifesting very loud and high-frequency acoustic pulsations when operating close to the nominal load. A reduced single-passage numerical model is developed to reduce the computational effort of the simulation while ensuring high accuracy in the assessment of fluid flow. The accuracy of the proposed numerical approach is investigated by comparing the frequency spectrum of the experimentally acquired acoustic frequency and the numerical pressure signals, confirming the nature of the machine’s vibrations. The validated numerical model represents a useful tool for an in-depth analysis of the machine’s hydrodynamics in the preliminary design phases. The proposed approach represents a valid alternative to the traditional correlation-based approach for the evaluation of the von Karman shedding frequency with less computational effort compared with a transient simulation of the entire machine.

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Study on the influence of volute structure on the performance of seawater-pumped storage hydropower plant unit

Ye,

Xia,

Yan

et al. 2024

Journal of Energy Storage

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Three-dimensional evolution of the flow unsteadiness in the S-shape of pump-turbines and its correlation with the runner geometry

Cited by 6 publications

References 19 publications

Application of the 3D Inverse Design Method in Reversible Pump Turbines and Francis Turbines

Application of the 3D Inverse Design Method in Reversible Pump Turbines and Francis Turbines

Effect of the von Karman Shedding Frequency on the Hydrodynamics of a Francis Turbine Operating at Nominal Load

Study on the influence of volute structure on the performance of seawater-pumped storage hydropower plant unit

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