Correlation of the Sediment Properties and Erosion in Francis Hydro Turbine Runner

Shrestha, Ujjwal; Chen, Zhenmu; Choi, Young Do

doi:10.5293/ijfms.2019.12.2.109

Cited by 7 publications

(3 citation statements)

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“…is _ E = 0:80u P W 2:15 26:33 À 61:07a + 64:82a 2 À 34:68a 3 + 9:76a 4 À 1:37a 5 + 0:07a 6 , and the mud wear rate formula for the movable guide vane after tungsten carbide spray-coating is _ E = 0:1u P W 2:15 14:75 À 30:76a + 32:05a 2 À 16:90a 3 + 4:68a 4 À 0:65a 5 + 0:04a 6 .…”

Section: Discussionmentioning

confidence: 99%

“…By performing CFD post-processing, the x and y velocities were extracted at all points from the 50% blade height to the tail of the movable guide vane. The velocity vector for each notch at the 50% blade height can be obtained according to the velocity triangle principle, and the angle between the velocity vector and the tangent direction of the notch is the angle of incidence of the sand and water: the punch angle function is shown in equation (6). The wear distribution DZ at the 50% blade height of an active guide vane can be obtained by performing flow sediment wear tests, with results as shown in Figure 35.…”

Section: Fitting Of Sediment Wear Rate Formulamentioning

confidence: 99%

“…By considering the large eccentric shaft structure of the guide vane, numerical calculations using the large eddy simulation (LES) and discrete phase models (DPMs) were performed to study the erosion characteristics and mechanisms of the guide vane and its head cover end surfaces, along with the flow mechanism behind the guide vane, the mechanism causing undesirable erosion behind the shaft, and the law describing the effects of the turbulence integration scale, the turbulent kinetic energy, and the turbulence angle on the erosion. Shrestha et al 6 discussed the sediment properties and their effects on erosion. Numerical analysis was performed to study the erosion of a Francis turbine by considering the synergistic effects of the sediment parameters (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Sediment wear of turbine guide vane before and after tungsten carbide treatment

Zhao

Peng

Yang

et al. 2022

Advances in Mechanical Engineering

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This paper describes three-dimensional unsteady simulations of sand–water flow within a turbine passage. Sand abrasion of a movable guide vane made from ZG06Cr13Ni4Mo is tested before and after tungsten carbide spray-coating. ZG06Cr13Ni4Mo forms medium- and high-strength stainless steel castings for engineering structures. Different sand particle sizes produce different wear forms on the guide vane. For 0.4-mm sediment particles, the guide vane head is more seriously worn by impact; for 0.058-mm sediment particles, the guide vane tail is more seriously worn by sediment scouring. Spray-coating the guide vane with tungsten carbide produces significant anti-sand-wear performance. Before tungsten carbide spraying, the total guide vane wear at the maximum position reached 45 μm after 90 h of testing, but after spray-coating, the guide vane wear at the maximum position was only 2.6 μm after 136 h of testing. Sand abrasion test results before and after tungsten carbide treatment are used to derive a calculation formula that provides a basis for anti-silt-abrasion hydraulic turbine design and operation. The movable guide vane’s life expectancy in a power plant was estimated. Before spraying, the guide vane had to be replaced after 22.7 months of operation at P = 11.4 MW, but it operated for 44.2 months after spray-coating.

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Section: Discussionmentioning

confidence: 99%

Section: Fitting Of Sediment Wear Rate Formulamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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