Investigation on the air-core vortex in a vertical hydraulic intake system

Zi, Dan; Wang, Fujun; Wang, Chaoyue; Huang, Congbin; Shen, Lian

doi:10.1016/j.renene.2021.06.062

Cited by 14 publications

(4 citation statements)

References 39 publications

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“…[22] Zi et al used numerical simulations to investigate the formation and evolution features of hollow vortices, revealing that the hollow-vortex bending phenomenon mainly resulted from the large-scale energy coherent structure in turbulent flow fields. [23,24] Vortex-induced vibrations are also one of the current research hotspots. [25,26] Vortex formation can cause gas entrainment.…”

Section: Introductionmentioning

confidence: 99%

Suppression and Control of Vortex Formation Caused by Boundary Disturbance during Ladle Teeming Process

Wang,

Li,

Sun

et al. 2024

steel research int.

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During the final stage of ladle teeming, vortex formation leads to air entrainment and slag entrapment, resulting in steel degradation. To effectively control this formation during ladle pouring, reverse rotation is introduced in the vortex to generate boundary disturbances. Further, water modeling is performed to investigate the influences of container diameter, nozzle diameter, initial disturbance, and reverse rotation on vortex formation. While larger‐diameter containers facilitate easier vortex formation, smaller‐diameter nozzles trigger faster vortex formation. Vortex penetration height and maintenance time increase with increasing initial tangential velocity. In addition, boundary disturbances resulting from reverse rotation effectively suppress vortex formation. Overall, to eliminate vortices, the applied disturbances must counteract the gradually accumulating angular momentum of the vortices.

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Section: Introductionmentioning

confidence: 99%

Suppression and Control of Vortex Formation Caused by Boundary Disturbance during Ladle Teeming Process

Wang,

Li,

Sun

et al. 2024

steel research int.

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“…The outflow of liquid propellant from the tanks is associated with forming vortices [4]. Other examples are the air-core vortex in the turbine intake in the upstream tank of a hydropower plant, the pump intake in a pumping system, or generally in the front of hydraulic inputs [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…The vortex phenomenon, in some cases, has destructive effects on the system performance, such as reduced flow, reduced efficiency of hydraulic machines (pumps and turbines), noise, harmful vibrations, damage or corrosion of components [4][5][6][7][8][9], and or instability of hydraulic machineries [6,10]. Delaying vortex formation time can be an essential step in improving system performance.…”

Section: Introductionmentioning

confidence: 99%

“…• Effect of ground Coriolis force and the presence of pre-rotation before fluid discharge. So far, many efforts have been made to solve the problems related to vortex formation, even in recent years [6,10,11]. Many researchers have tried to provide analytical relations for the velocity components and the critical height in a vortex stream by simplifying the mass continuity and Navier-Stokes equations [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of transient vortex formation at the outlet of a tank containing gas-liquid phases

Mohseni

Domfeh

2023

Preprint

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One of the basic phenomena when a liquid leaves a tank, is the formation of vortices. This phenomenon can significantly affect the remaining liquid mass in the tank and the penetration of air and bubbles into the system. As a result, system performance may be disrupted. This study numerically investigates the influence of parameters such as discharge time, gas pressure, liquid depth, and angular velocity of the reference frame on the vortex characteristics. In addition, the near-wall behavior of the analytical relations proposed for the tangential velocity has been revised based on the boundary layer theory. The "volume of fluid" model (VOF) and the SST k-ω turbulence model have been used to solve the two-phase turbulent flow. The results show that increasing the gas pressure from 1 to 5 bar and its direct impact on the liquid surface significantly accelerates the formation of the vortex and the critical height. This phenomenon causes, after the starting of liquid discharge, the air core to reach the inlet port of the outlet pipe about 7 seconds earlier. As a result, much more liquid mass remains in the tank. Also, the increase in the angular velocity of the reference frame from 0.1 to 1 rad/s causes the critical height to be formed much sooner and the remaining liquid mass to increase by 32 kg. Furthermore, the amount and the variations of turbulent viscosity significantly differ from the semi-empirical constant values, limiting their use to particular streams.

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Sources of Pressure Pulsation in the Machines Hydraulic Systems

Stosiak,

Karpenko

2024

Synthesis Lectures on Mechanical Engineering

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Investigation on the air-core vortex in a vertical hydraulic intake system

Cited by 14 publications

References 39 publications

Suppression and Control of Vortex Formation Caused by Boundary Disturbance during Ladle Teeming Process

Suppression and Control of Vortex Formation Caused by Boundary Disturbance during Ladle Teeming Process

Numerical analysis of transient vortex formation at the outlet of a tank containing gas-liquid phases

Sources of Pressure Pulsation in the Machines Hydraulic Systems

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