Influence of Solid–Liquid Two-Phase Flow on Cavitation of Tubular Turbine Blades Under Combined Conditions

Cheng, Chien‐Hong; Li, Zhenggui; Fubing, HE; Wu, Siyuan; Zeng, Chuchu; Zhang, Kui; Zheng, Jianhua

doi:10.3389/fenrg.2022.904201

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…Owing to the complex structure of the guide vane and runner sections, a tetrahedral mesh was used [20] . For the cavitation calculation, the number of grid cells has a large impact on the hydraulic turbine cavitation characteristics [21] . To reduce the influence of the grid number on the calculation accuracy, the correspondence between the overall grid number of the hydraulic turbine, the cavitation coefficient of the hydraulic turbine, and the minimum pressure of the vortex rope of the draft tube under combined working conditions was analyzed, as shown in Figure 2.…”

Section: Tubular Hydraulic Turbine Model and Meshingmentioning

confidence: 99%

Exploration of the mechanism of cavitation vortex rope and vortex development in the draft tube of tubular turbine units

Cheng,

Li,

Shen

et al. 2024

International Journal of Agricultural and Biological Engineering

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Draft tube vortex rope is considered a special cavitation flow phenomenon in tubular turbine units. Cavitation vortex rope is one of the most detrimental factors affecting the safety of hydraulic turbines. In this study, ANSYS CFX software was utilized to numerically simulate the internal cavitation flow of a hydraulic turbine draft tube. The evolution of the cavitation vortex core was characterized by vortex line distribution and vorticity transport equation. The shape and number of blades influenced the revolving direction and distribution characteristics of the vortex close to the runner cone, which formed a counterclockwise-clockwise-counterclockwise distribution pattern. Simultaneously, there were many secondary flows in the draft tube. Mutual cancellation and dissipation between the flows was one of the reasons for reduction in vorticity. When the cross-sectional shape of the draft tube was changed, the vorticity was distributed from the center of the vortex rope to all parts of the cross-sectional draft tube, with extreme values at the center and at the walls. The vortex stretching and dilatation terms played a major role in the change in vorticity, with the baroclinic torque having an effect at the center of the vortex rope, this study is helpful to understand the flow of water in the draft tube and guide the design and optimization of the draft tube in engineering application.

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Section: Tubular Hydraulic Turbine Model and Meshingmentioning

confidence: 99%

Exploration of the mechanism of cavitation vortex rope and vortex development in the draft tube of tubular turbine units

Cheng,

Li,

Shen

et al. 2024

International Journal of Agricultural and Biological Engineering

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show abstract

“…The computational stability, calculation accuracy and calculation speed reflected in the structural grid are better than those of non-structural grids, so the structural grid drawn by ICEM CFD is used for numerical calculation. Winslow P. et al (2010); Guo et al (2019); Cheng et al (2021); Zeng, (2022); Cheng et al (2022).…”

Section: Numerical Model and Calculation Setup Division Of 3d Model A...mentioning

confidence: 99%

Analysis of Surface Pressure Pulsation Characteristics of Centrifugal Pump Magnetic Liquid Sealing Film

Wang

et al. 2022

Front. Energy Res.

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In order to discuss the surface pressure pulsation characteristics of the magnetic-fluid sealing membrane of centrifugal pump, this paper studies the surface pressure pulsation characteristics of the shaft end sealing membrane under different flow operating conditions of centrifugal pump based on the combination of numerical calculation and experimental verification. The results show that the pressure value on the surface of the magnetic-fluid sealing film decreases with the increase of the flow rate of the centrifugal pump, and the pressure on the surface of the magnetic-fluid sealing film has periodic pulsation, and the period is the time required for a single blade to sweep the volute separating tongue. In one rotation cycle of the runner, the number of reciprocating movements of the magnetic-hydraulic sealing film is the same as the number of blades of the runner. The main reason for the pressure pulsation is that the impeller periodically sweeps the fixed surface of the centrifugal pump.

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Effect of solid particle size on cavitation around hydrofoil

Lin,

Liu,

Zhang

et al. 2024

Physics of Fluids

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Pumps and turbines are widely used in marine engineering, and hydrofoil cavitation, a fundamental form of pump and turbine cavitation, is often used as a simplified hydraulic model to study cavitation issues. However, oceans and lakes contain many particulate impurities that can exacerbate the instability of the cavitation flow field around hydrofoils. Currently, there are few studies on solid particle-induced cavitation in hydrofoils. To investigate the influence of small particles on blade cavitation, the National Advisory Committee for Aeronautics 0006 hydrofoil was used as a simplified blade model. Using the large eddy simulation-volume of fluid method and the discrete phase model, the three-dimensional cavitation flow field around the hydrofoil was analyzed for nine different particle sizes at a 3% particle concentration and compared to the flow field in clean water. The results show that small particles cannot penetrate the bubble film but move along the surface of the cavity, slightly increasing the vortex and turbulence intensity within the cavitation flow field, thereby promoting cavitation development and reducing the hydrofoil's hydrodynamic performance. As particle size increases, the overall effect of particle number becomes stronger, while the reduction of particle number leads to a reduced impact of small particles on the cavitation flow field.

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Influence of Solid–Liquid Two-Phase Flow on Cavitation of Tubular Turbine Blades Under Combined Conditions

Cited by 3 publications

References 19 publications

Exploration of the mechanism of cavitation vortex rope and vortex development in the draft tube of tubular turbine units

Exploration of the mechanism of cavitation vortex rope and vortex development in the draft tube of tubular turbine units

Analysis of Surface Pressure Pulsation Characteristics of Centrifugal Pump Magnetic Liquid Sealing Film

Effect of solid particle size on cavitation around hydrofoil

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