CFD Based Analysis of Combined Effect of Cavitation and Silt Erosion on Kaplan Turbine

Kumar, Dinesh; Bhingole, P.P.

doi:10.1016/j.matpr.2015.07.276

Cited by 27 publications

(18 citation statements)

References 10 publications

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“…Cavitation erosion is also affected by solid particles; combined cavitation and sand erosion carries vapor bubbles into high-pressure regions and produces cavitation erosion [23]. While there are a few studies that have investigated the solid-liquid two-phase flow, there are no studies on the combined cavitation and sand erosion in the turbine.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Sediment Erosion Analysis in Francis Turbine

Rakibuzzaman

Kim

et al. 2019

Sustainability

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Effective hydraulic turbine design prevents sediment and cavitation erosion from impacting the performance and reliability of the machine. Using computational fluid dynamics (CFD) techniques, this study investigated the performance characteristics of sediment and cavitation erosion on a hydraulic Francis turbine by ANSYS-CFX software. For the erosion rate calculation, the particle trajectory Tabakoff–Grant erosion model was used. To predict the cavitation characteristics, the study’s source term for interphase mass transfer was the Rayleigh–Plesset cavitation model. The experimental data acquired by this study were used to validate the existing evaluations of the Francis turbine. Hydraulic results revealed that the maximum difference was only 0.958% compared with the CFD data, and 0.547% compared with the experiment (Korea Institute of Machinery and Materials (KIMM)). The turbine blade region was affected by the erosion rate at the trailing edge because of their high velocity. Furthermore, in the cavitation–erosion simulation, it was observed that abrasion propagation began from the pressure side of the leading edge and continued along to the trailing edge of the runner. Additionally, as sediment flow rates grew within the area of the attached cavitation, they increased from the trailing edge at the suction side, and efficiency was reduced. Cavitation–sand erosion results then revealed a higher erosion rate than of those of the sand erosion condition.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of Sediment Erosion Analysis in Francis Turbine

Rakibuzzaman

Kim

et al. 2019

Sustainability

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“…Nennemann and Vu (2007) simulated the GVs and runner of a Kaplan turbine prototype to predict the effects of cavitation on the runner and discharge ring in the case study. More recently, Kumar and Bhingole (2015) implemented CFD methods to analyze the combined effect of cavitation and slit erosion on a Kaplan turbine.…”

Section: Introductionmentioning

confidence: 99%

Effects of Upstream Flow Conditions on Runner Pressure Fluctuations

Amiri¹,

Mulu²,

Raisee³

et al. 2017

JAFM

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The rotor-stator interaction and the corresponding pressure fluctuations represent one of the sources of pressure and load fluctuations on the rotating parts of rotating machineries. The high-Reynolds flow is subject to rotation in the comparably large vaneless space of axial turbines, causing wake interaction and wake dissipation in this region. This increases the level of flow complexity in this region. This study examined the effect of the flow condition entering the spiral casing on the flow condition within the distributor and the runner and the physical source of pressure fluctuations exerted on the runner of a Kaplan turbine model. Simulations were performed within the water supply system, including the upstream tank, penstock, and the Francis turbines, the level of entering the spiral casing; the results were compared with laser Doppler anemometry (LDA) results. The results were considered as the inlet boundary condition for simulation of the turbine model from the spiral inlet to the draft tube outlet to investigate the flow condition within the distributor and the runner. The CFD simulations showed that the water supply system induces inhomogeneity to the velocity distribution at the spiral inlet. However, the flow condition does not affect the pressure fluctuations exerted on the runner blades due to the rotor-stator interactions. Moreover, the dominant frequencies exerted on the runner blades were accurately approximated although the amplitudes of the fluctuations were underestimated.

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“…The particle size is 100 μm with different particle concentrations of 10%, 20%, and 30%. Kumar and Bhingole, (2015) employed numerical simulations to investigate the combined erosion in a Kaplan turbine rated capacity of 7 MW using ANSYS 14 software. The computational domain was constructed from the casing inlet to the draft tube outlet, where 15 aero wicket gates and five runner blades were used, and the unstructured tetrahedral mesh was generated.…”

Section: Figure 10mentioning

confidence: 99%

A review on synergy of cavitation and sediment erosion in hydraulic machinery

Wang

Tan²,

Chen³

et al. 2022

Front. Energy Res.

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The synergy of cavitation and sediment erosion is the most severe destruction in hydraulic machinery in sediment-laden rivers, and currently the physics and mechanism are still lack of understanding. The synergy effects of cavitation and sediment erosion not only reduce the efficiency and life of hydraulic machinery but also cause costs in operation and maintenance. With the rapid development of renewable clean energy and the transformation of water resources, an increasing number of new hydropower stations and water diversion projects are currently planned or under construction, where most of them are in sediment-laden rivers. In the present paper, the research work, including theory, experiment, and simulation, in this field carried out by various investigators are presented and discussed. Physical mechanisms involved in the synergy of cavitation and sediment erosion which is responsible for material damage as investigated by researchers have also been discussed, and would help to identify gaps for future studies.

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CFD Based Analysis of Combined Effect of Cavitation and Silt Erosion on Kaplan Turbine

Cited by 27 publications

References 10 publications

Numerical Study of Sediment Erosion Analysis in Francis Turbine

Numerical Study of Sediment Erosion Analysis in Francis Turbine

Effects of Upstream Flow Conditions on Runner Pressure Fluctuations

A review on synergy of cavitation and sediment erosion in hydraulic machinery

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