Empirical modelling of sediment erosion in Francis turbines

Thapa, Biraj Singh; Thapa, Bhola; Dahlhaug, Ole Gunnar

doi:10.1016/j.energy.2012.02.066

Cited by 98 publications

(35 citation statements)

References 8 publications

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“…The removal of paint in the outlet region might have occurred due to micro erosion, which, according to Brekke [29], is caused due to high rotational motion of fine sand particles. Figure 5 shows the comparison of wear observed in the test specimens and the wear observed in the runner outlet of JHC [10]. It can be seen that the erosion damage is mostly located in the far outlet region near to the trailing edge of the blade, which is identical to the pattern of wear observed in the turbines operating in real cases.…”

Section: Pattern Of Erosionsupporting

confidence: 58%

“…Wear observed in the test specimen and in the runner outlet of JHC [10] and inlet of Cahua Power Plant [21]. The observation of erosion pattern (see Fig.…”

Section: Figmentioning

confidence: 99%

“…Major research works were mostly focused on establishing empirical relations to estimate the effects of sediment erosion in hydraulic turbines and identification of the parameters upon which the erosion rate is dependent. Various mathematical models have been developed to estimate the effect of sediment erosion in different hydraulic components of the power plant [2][3][4][5][6][7][8][9][10][11]. These mathematical models are generally empirical and statistical models developed from experimental measurements at the project site.…”

Section: Current Status Of Researchmentioning

confidence: 99%

See 2 more Smart Citations

Comparative study of sediment erosion on alternative designs of Francis runner blade

Rajkarnikar¹,

Neopane²,

Thapa³

2015

International Journal of Fluid Machinery and Systems

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The aim of this study was comparative analysis of sediment-induced erosion on optimized design and traditional design of Francis runner blade. The analysis was conducted through laboratory experiments in a test rig called Rotating Disc Apparatus. The results showed that the extent of erosion was significantly less in the optimized design when compared based on the material loss. It was observed that the optimized design could reduce sediment erosion by about 14.4% if it was used in place of the reference design for entire duration of the experiment. Based on the observations and results obtained, it has been concluded that the optimization of hydraulic design of blade profile of Francis runner can significantly reduce the effect of sediment-induced erosion.

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Section: Pattern Of Erosionsupporting

confidence: 58%

“…Wear observed in the test specimen and in the runner outlet of JHC [10] and inlet of Cahua Power Plant [21]. The observation of erosion pattern (see Fig.…”

Section: Figmentioning

confidence: 99%

Section: Current Status Of Researchmentioning

confidence: 99%

See 1 more Smart Citation

Comparative study of sediment erosion on alternative designs of Francis runner blade

Rajkarnikar¹,

Neopane²,

Thapa³

2015

International Journal of Fluid Machinery and Systems

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“…The presence of sand particles in water often causes excessive abrasion of turbine components exposed to the flow [1]. In particular, the flow components of Francis turbines are the most vulnerable to abrasive damage [2]. The abrasion of these components may result in considerable reduction of the performance of the entire power plant [3].…”

Section: Introductionmentioning

confidence: 99%

Research on the Influence of Solid Volume Fractions on Turbine Performance

Wang¹

2016

IJHT

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The existence of sediment in water causes excessive abrasion of turbine blades and affects the performance of the turbine. It is important to predict the influence of solid volume fractions on turbine performance. The solid-liquid two-phase turbulent flow in a Francis turbine was numerically simulated by establishing a mathematical model for the flow passage of the turbine on the basis of the time-averaged basic equations and κ-ε equations. The turbulent flow in this turbine was calculated on the design point in clear water, as well as in sandy water with the average solid volume fractions of 0.5 % and 5 % at the inlet of the spiral case. The pressure distributions and sand concentrations on the leading side and suction side of the runner blades, as well as the velocities, turbulent kinetic energies and their dissipation rates on the horizontal section of runner were compared under these three conditions to illustrate the influences of the solid volume fractions on the turbine performance. The results show that with increasing solid volume fraction, the pressure difference on the leading side and suction side of the blade increased; the sand erosion on the leading side was much worse than that on the suction side, especially at the outlet area near the runner band; the velocity changes of sand particles and water were small at the outlet area, and the velocity of sand particles became smaller than that of water; the turbulent kinetic energy and its dissipation rate were slightly affected by the solid volume fractions. All of these factors lead to serious cavitation on the suction side and sand erosion on the leading side. The joint effect of cavitation and sand erosion will be aggravated with increasing solid volume fractions which will further reduce the performance of the turbine.

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“…In India, silt erosion problem occurs mainly in those projects which are situated in the Himalayan and in the north-eastern region (Thapa, Thapa and Dahlhaug 2012). Nepal is also facing silting problem in hydropower plants with sediment yield of about 4,240 tonnes/km 2 / year.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Erosion and Performance of Turgo Impulse Turbine

Khurana¹,

Varun²,

Kumar³

2013

Hydro Nepal

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The present study has been carried out to investigate the effect of silt size, concentration, jet velocity, nozzle angle and operating hour on the erosive wear as well as on the performance of the Turgo impulse turbine in actual flow conditions. Samples of silt were collected from the Beas River (India) near the Pandoh dam. It has been found experimentally that silt parameters, nozzle angle and operating hour of the Turgo turbine increases the erosive wear rate in the turbine components causing efficiency loss in the Turgo impulse turbine and final breakdown of hydro turbines.

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Empirical modelling of sediment erosion in Francis turbines

Cited by 98 publications

References 8 publications

Comparative study of sediment erosion on alternative designs of Francis runner blade

Comparative study of sediment erosion on alternative designs of Francis runner blade

Research on the Influence of Solid Volume Fractions on Turbine Performance

Experimental Investigation of Erosion and Performance of Turgo Impulse Turbine

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