Numerical Investigations of Solid-Liquid Two-Phase Turbulent Flows through Francis Turbine

Tang, Xuelin; Yang, Shang Yu; Wang, Fu Jun; Wu, Yi-Liang

doi:10.4028/www.scientific.net/amr.548.853

Cited by 3 publications

(3 citation statements)

References 10 publications

(8 reference statements)

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“…It has been found that the erosion process is strongly dependent on the operating conditions of the turbines. Tang et al 19 conducted secondary development to CFD and studied the solid-liquid two-phase flow in a Francis turbine by using the modified algebraic model, and the simulation results are consistent with the actual project. Thapa et al 20,21 optimized the turbine in sandy water through numerical simulation and experimental study, effectively reduced the sand erosion, and improved the turbine efficiency.…”

Section: Introductionmentioning

confidence: 79%

Numerical analysis of solid–liquidtwo-phase turbulent flow in Francis turbine runner with splitter bladesin sandy water

Hong

Zeng

Wang

et al. 2015

Advances in Mechanical Engineering

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As the key component of a hydroelectric power generation system, hydraulic turbine plays a decisive role in the overall performance of the system. There are many sandy rivers in the world, and turbines working in these rivers are seriously damaged. Therefore, the research of flow in sandy water has great theoretical significance and practical value. Based on the specific hydrological conditions of a hydropower station, the solid-liquid two-phase flow in the whole flow passage of a Francis turbine with splitter blades in sandy water was numerically studied. A geometric model of the whole flow passage of the Francis turbine was established on the basis of given design parameters. The solid-liquid two-phase turbulent flows in Francis turbine runner under three different loads were numerically analyzed by using this model. The three different loads are as follows: Condition 1: single unit with 1/4 load, Condition 2: single unit with 1/2 load, and Condition 3: single unit with full load. The distributions of pressure and sand concentration on the leading side and the suction side of the runner blades, as well as the velocity vector distribution of water and sand on the horizontal section of the runner, were obtained under different load conditions. Therefore, the damages to various flow passage components by sand can be qualitatively predicated under various conditions. To guarantee the safety and stability of the unit, the adverse conditions shall be avoided, which can provide certain reference for plant operation.

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Section: Introductionmentioning

confidence: 79%

Numerical analysis of solid–liquidtwo-phase turbulent flow in Francis turbine runner with splitter bladesin sandy water

Hong

Zeng

Wang

et al. 2015

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…The CFD software was used and secondly developed to simulate the solid-liquid two-phase flow in turbines. Tang, et al conducted secondary development to CFD, and studied the solid-liquid two-phase flow in a Francis turbine by using the improved algebraic model, and the simulated results are consistent with the actual project [13]. The joint effect of sand wear and cavitation to the erosion of turbine components was studied.…”

Section: Introductionmentioning

confidence: 98%

Numerical analysis of solid-liquid turbulent flow in Francis turbine spiral case

Wang¹,

Liu²

2017

MMC_B

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Based on the hydrological conditions of a hydropower station, the three-dimensional turbulent flow in a Francis turbine with splitter blades was numerically simulated in sandy water. The solid-liquid two-phase turbulent flow in the spiral case at different loads was numerically analyzed in emphasis, including the distribution of pressure, sand volume and velocity on different sections of the spiral case. The movement pattern of sandy water in the turbine spiral case was studied. The results show that the pressure distribution in the spiral case varies uniformly at different loads, a high pressure zone will be generated at the bottom of the spiral case and a low pressure zone at the outlet; the spiral case bottom and the nose has the largest area of sand and the highest sand volume fraction; with the increasing of the load, the high pressure zone moves from the bottom to the exterior margin, the sand volume fraction decreases, and the sediment-carrying capacity increases. At off-design conditions, the joint effect of sand abrasion and cavitation will worsen the erosion of the spiral case.

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“…At present, some progress has been made in numerical simulation of centrifugal pump flow performance [25][26][27][28][29][30][31][32][33][34][35][36]. However, the overall flow performance of the centrifugal pump, especially the two-phase flow performance under the condition of high concentration of fine particles, is not sufficiently studied due to the complexity of solid-liquid two-phase flow in the pump.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Fine Particle Solid‐Liquid Two‐Phase Flow in a Centrifugal Pump

Wang

Chen

Zhou

et al. 2021

Shock and Vibration

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To study the effect of fine particle size and volume concentration on the performance of solid-liquid two-phase centrifugal pump, the mixture multiphase flow model, RNG k-ε turbulence model, and SIMPLEC algorithm were used to simulate the two-phase flow of the centrifugal pump. The effects of particle size and volume concentration on internal pressure distribution, solid volume distribution, and external characteristics were analyzed. The results show that under the design discharge conditions, with the increase of particle size and volume concentration, the internal pressure of the flow field will decrease, and the volume fraction of solid phase in the impeller passage will also decrease as a whole. The solid particles gradually migrate from the suction surface to the pressure surface, and the particles in the volute channel are mainly concentrated in the flow channel near the outlet side of the volute. With the increase of particle size and volume concentration, the negative pressure value at the inlet of centrifugal pump increases, the total pressure difference at the inlet and outlet decreases, and the head and efficiency decrease accordingly.

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Numerical Investigations of Solid-Liquid Two-Phase Turbulent Flows through Francis Turbine

Cited by 3 publications

References 10 publications

Numerical analysis of solid–liquidtwo-phase turbulent flow in Francis turbine runner with splitter bladesin sandy water

Numerical analysis of solid–liquidtwo-phase turbulent flow in Francis turbine runner with splitter bladesin sandy water

Numerical analysis of solid-liquid turbulent flow in Francis turbine spiral case

Numerical Simulation of Fine Particle Solid‐Liquid Two‐Phase Flow in a Centrifugal Pump

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