Influence of dynamic seals on silt abrasion of the impeller ring in a centrifugal pump

Gao, Yuanyong; Zhang, Kai; Huai, Wenxin; Wu, Yulin

doi:10.1177/0957650913490299

Cited by 8 publications

(4 citation statements)

References 10 publications

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“…In this paper, the Eulerian-Lagrangian method is used to simulate the discrete phase particles in the sediment-laden stream of the water turbine [13][14][15]. The flow control equation of continuous phase is solved by N-S equation.…”

Section: Governing Equationsmentioning

confidence: 99%

“…One is the Finnie model, whose erosion amount is a function of velocity and impact angle. The other is the Tabakoff erosion model [13], which includes more available solid parameters and has been verified by the test results of Francis turbine components and materials. Zhang et al [14] analyzed the erosion condition of the turbine by using the Tabakoff erosion model.…”

Section: Introductionmentioning

confidence: 97%

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Numerical Prediction of Erosion of Francis Turbine in Sediment-Laden Flow under Different Heads

Wang,

Song,

Wang

et al. 2023

Processes

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Hydropower stations are an important source of clean energy, usually operating in sandy water flow, and the turbine wheels may suffer severe wear and tear. In addition, during the operation of the unit, it is necessary to operate at different water heads according to the actual situation, which will result in varying degrees of wear and tear. In this paper, the Lagrange method is used to study the wear characteristics of a Francis turbine under different water heads. The research object is the water turbine in Wanjiazhai Hydropower Station. Research has shown that wear on the walls of the turbine volute, guide vanes, and runner is inevitable, and the clearance walls are also vulnerable to wear. The difference in the water head mainly affects the movement trajectory and impact speed of particles. The higher the water head, the more severe the wear on the wall surface of the flow passage components. Both the crown and lower ring of the runner are worn. The impact of particles causes wear at this location, and the greater the relative velocity relative to the runner, the more severe the wall wear. This indicates that reasonable head operating conditions can effectively reduce wall wear, which provides guidance for the operation of hydraulic turbines.

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Section: Governing Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Numerical Prediction of Erosion of Francis Turbine in Sediment-Laden Flow under Different Heads

Wang,

Song,

Wang

et al. 2023

Processes

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“…The sediment erosion in the centrifugal pump is a typical abrasive erosion. 1,[7][8][9][10] Qian investigated the effects of the silt concentration and silt size on pump performance by devising a new experiment for a double-suction centrifugal pump. 11 Generally, the flow with FSV in pure water is a typical airliquid two-phase flow.…”

Section: Introductionmentioning

confidence: 99%

Numerical prediction of the effect of free surface vortex air-entrainment on sediment erosion in a pump

Song

Wang

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Sediment erosion through synergetic effects between free surface vortex (FSV) and particle erosion in silt-laden flow seriously affects the safe operations of pump. The purpose of this paper is to study the influence of free surface vortex entrainment on the erosion inner the pump impeller, aimed at the FSV and sediment erosion in sediment laden flow in a pump station of Yellow River, a new Eulerian-Lagrange approach was applied to simulate the sediment-laden flow by combining the Lagrange particle tracking approach and Volume of Fluid (VOF) method, followed by the application of Tabakoff model to estimate the erosion. Volume of fluid method was used to simulate the continuous flow FSV, and Lagrange method the particle trajectory. The theoretical model and filed results on site were used to verify the reliability of the proposed approach. Free surface vortex on particle motion and microscopic interactions between air and erosion were reviewed and discussed. Combined with the theoretical analysis and calculation results, the particle impact angle in the impeller was analyzed, and the erosion types were defined. Air entrainment by FSV does not directly erode the impeller components, but mainly changes the position, the local velocity and the concentration of the particles, which aggravates the sediment erosion in the impeller. Interestingly, air entrainment can reduce the surface erosion at some instantaneous moments. The present work may provide important engineering insights to resolve the erosion.

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“…Under the small flow condition, the average velocity in the clearance increases, and the average velocity along the flow direction decreases, which proves that the clearance has throttling effect. Under the condition of large flow rate, when the clearance size of the band increases, the pressure distribution on the back of the runner, the flow pattern of the draft tube, and the pressure distribution of the draft tube also improve [9].…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of the Guide Vane Opening on the Band Clearance Sediment Erosion in a Francis Turbine

Song

Zhou²,

Song³

et al. 2022

JMSE

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Sediment erosion is a negative phenomenon for the water turbine. The purpose of this paper is to study the effect of the guide vane opening on the particle motion and sediment erosion in the band chamber using the Euler–Lagrangian approach. The software Ansys CFX and Tabakoff erosion model are used to simulate the sediment laden flow in the full flow passage of the hydraulic turbine. The results are in good agreement with the actual erosion character on site. Results show that the guide vane opening has a positive correlation with the flow in the non-clearance channel. The increase of the guide vane opening will increase the erosion of the runner blade head, but the friction wear on the outlet side of the blade surface will decrease. The rotating action of the runner makes the sediment particles in the band chamber rotate rapidly around the center of the runner and constantly collide with the band chamber wall. Under the small opening, the smaller the opening, the easier the leakage of the band clearance occurs. The unsteady flow in the band chamber will disturb the motion trajectory of particles, change the impact angle of particles, and affect the wear in the band chamber. Under different openings, the change law of the erosion in the band clearance is closely related to the change law of clearance leakage.

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Influence of dynamic seals on silt abrasion of the impeller ring in a centrifugal pump

Cited by 8 publications

References 10 publications

Numerical Prediction of Erosion of Francis Turbine in Sediment-Laden Flow under Different Heads

Numerical Prediction of Erosion of Francis Turbine in Sediment-Laden Flow under Different Heads

Numerical prediction of the effect of free surface vortex air-entrainment on sediment erosion in a pump

Study on the Effect of the Guide Vane Opening on the Band Clearance Sediment Erosion in a Francis Turbine

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