Numerical research of cavitation on Francis turbine runners

Çelebioğlu, Kutay; Altıntaş, Burak; Aradağ, Selin; Taşcıoğlu, Yiğit

doi:10.1016/j.ijhydene.2017.03.180

Cited by 55 publications

(32 citation statements)

References 19 publications

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“…Three locations each were chosen on spiral casing and pressure-suction side of the runner blade and five were chosen in the draft tube were labeled as seen in Figure 15. Celebioglu et al [43] studied the various cavitation types, such as suction side, pressure side, leading edge, travelling bubble, draft tube swirl, and inter-blade vortex cavitation, etc. In order to prevent cavitation, runner blades must be designed, taking the flow characteristics into account.…”

Section: Vortex Rope Formationmentioning

confidence: 99%

Sediment and Cavitation Erosion in Francis Turbines—Review of Latest Experimental and Numerical Techniques

Noon

Kim

2021

Energies

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Sediment and cavitation erosion of the hydroelectric power turbine components are the fundamental problems in the rivers of Himalayas and Andes. In the present work, the latest research conducted in both the fields by various investigators and researchers are discussed and critically analyzed at different turbine components. Analysis shows that both types of erosion depends on flow characteristics, surface, and erodent material properties. Design optimization tools, coalesced effect (CE) of sediment and cavitation erosion and well conducted experiments will yield results that are beneficial for erosion identification and reduction. Although some researchers have done experimental work on the coalesced effect (CE) of sediment and cavitation erosion, very limited Computational Fluid Dynamics (CFD) work is available in literature. The present research work will be beneficial for practitioners and researchers in the future to address the erosion problem successfully.

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Section: Vortex Rope Formationmentioning

confidence: 99%

Sediment and Cavitation Erosion in Francis Turbines—Review of Latest Experimental and Numerical Techniques

Noon

Kim

2021

Energies

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“…For that, both LEC and TEC of different sizes have been considered, and the added mass effects have been compared with those corresponding to the pure water condition without cavitation. A review of the numerical results of cavitation in Francis turbine runners [22] and the visual observations from reduced scale models [23] and full-scale Francis prototypes [24] has permitted us to determine the most probable locations and sizes of cavitation, as shown in Figure 2. First of all, a single blade has been investigated to evaluate the level of significance for the proposed cavity shapes and dimensions.…”

Section: Introductionmentioning

confidence: 99%

Added Mass Effects on a Francis Turbine Runner with Attached Blade Cavitation

Huang

Escaler

2019

Fluids

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To have a safe structural design, an analysis of the dynamic behavior of a Francis turbine runner with consideration of the added mass effects of surrounding water is necessary during design phase. Both in design and at off-design operations, large-scale forms of attached cavitation may appear on runner blades and can change the added mass effects of the surrounding fluid in relation to a single water domain. Consequently, a numerical investigation of the modal response of a Francis runner has been carried out by reproducing the presence of various sizes of leading edge cavitation (LEC) and trailing edge cavitation (TEC). The fluid–structure interaction problem has been solved by means of an acoustic-structural coupling method. The calculated added mass effects with cavitation have been compared with those corresponding to the pure water condition without cavitation. Firstly, a single blade has been investigated to evaluate the level of significance for the proposed cavity shapes and dimensions. Afterwards, based on the results obtained, the complete runner structure has been considered, factoring in similar cavity shapes and locations. The results prove that significant added mass effects are induced on the entire runner by the attached cavitation that increase the natural frequencies of the first modes. Moreover, the added mass effects increase with cavity size and amplitude of blade deformation below the cavity.

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“…In the future research, the optimization design of the guide vane based on metaheuristic methods [21,22] and analysis of solid-liquid two-phase flow will be investigated. Moreover, the cavitation erosion of turbine in solid-liquid two-phase flow will be another study [23]. These studies will be of great importance to the normal and highefficiency running of turbine.…”

Section: Discussionmentioning

confidence: 99%

Dynamics and Wear Analysis of Hydraulic Turbines in Solid-liquid Two-phase Flow

Wang

Zhao

2019

Open Physics

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To solve unstable operating and serious wearing of a hydraulic turbine in its overflow parts under solid-liquid two-phase flow, a particle model software and an inhomogeneous model in CFX are used to simulate the hydraulic turbine to understand the wearing of overflow parts and the external characteristics under the solid-liquid two-phase flow. Eleven different conditions at different densities and concentration have been calculated. The simulation results show that the volume distribution of solid particles is larger at the turn of the volute and nose end, resulting in the serious wear in this area. Due to uniform flow at the butterfly edge of volute under solid-liquid two-phase flow, the wear at the entrance of guide vane, the inlet of the blade and the outlet in the shroud is more serious than in other sections. Meanwhile, the collision between the solid phase particles and the overflow components is more intense under solid-liquid two-phase flow in the rotor which can lead to cavitation especially in the outlet and shroud of the blade. In addition, with the increase of density and concentration of solid particles the inlet and outlet pressure difference gradually rises, causing the efficiency loss of the hydraulic turbine.

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Numerical research of cavitation on Francis turbine runners

Cited by 55 publications

References 19 publications

Sediment and Cavitation Erosion in Francis Turbines—Review of Latest Experimental and Numerical Techniques

Sediment and Cavitation Erosion in Francis Turbines—Review of Latest Experimental and Numerical Techniques

Added Mass Effects on a Francis Turbine Runner with Attached Blade Cavitation

Dynamics and Wear Analysis of Hydraulic Turbines in Solid-liquid Two-phase Flow

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