A study on the effectiveness of an anti vortex device in the sump model by experiment and CFD

Kim, C G; Choi, Young‐Do; Choi, Jong-Woong; Lee, Young‐Ho

doi:10.1088/1755-1315/15/7/072004

Cited by 19 publications

(7 citation statements)

References 5 publications

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“…In an effort to weaken and suppress vortices in pump sumps, there have been numerous studies on the implementation of passive flow control devices. For example, anti-vortex baffles have been considered (Yang 2017;Kim et al 2012). In particular, Kim et al (Kim et al 2012) studied the effectiveness of an anti-vortex device in the sump model by experiments and numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

“…For example, anti-vortex baffles have been considered (Yang 2017;Kim et al 2012). In particular, Kim et al (Kim et al 2012) studied the effectiveness of an anti-vortex device in the sump model by experiments and numerical simulations. Their results showed that the passive anti-vortex device can enhance the intake efficiency by up to 91% with reduced flow unsteadiness into the pump.…”

Section: Introductionmentioning

confidence: 99%

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Active Flow Control of a Pump-Induced Wall-Normal Vortex With Steady Blowing

Liu

Nohmi

et al. 2020

Journal of Fluids Engineering

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The emergence of a submerged vortex upstream of a pump can reduce pump intake efficiency and cause structural damage. In this study, we consider the use of active flow control with steady blowing to increase the pressure distribution within a single-phase pump-induced wall-normal vortex model, which is based on the Burgers vortex with a no-slip boundary condition prescribed along its symmetry plane. The goal of our control is to modify the vortex core velocity profile. These changes are sought to increase the core pressure such that detrimental effects on the pump are alleviated. Three-dimensional direct numerical simulations (DNS) are performed to examine the dynamics of the vortex with the application of axial momentum injection at and around the root of the vortex. We find that the active flow control approach can effectively modify the wall-normal vortical structure and significantly increase the low-core pressure by up to 81% compared to that of the uncontrolled case. The result shows that the control setup is also effective when it is introduced in an off-centered manner. Compared to the unsteady blowing and suction based actuation from our previous work , the current steady control technique offers an effective and simple flow control setup that can support robust operations of pumps.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Active Flow Control of a Pump-Induced Wall-Normal Vortex With Steady Blowing

Liu

Nohmi

et al. 2020

Journal of Fluids Engineering

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“…In addition to the studies on the flow dynamics in the pump intake, a few number of studies have focussed on the performance of AVDs. Kim et al (2010) studied the performance of AVDs with rectangular shaped and trident shaped bars and found that the AVD installation close to the location of vortex occurrence makes the vortex attenuation and a uniform flow formation. Kang et al (2014) investigated the effective shape of a floor splitter in reducing the subsurface vortices.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the surface and subsurface vortices suppression in a rectangular pump basin using anti‐vortex devices

Safarzadeh

Talebi

Mohajeri

2019

Water & Environment J

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The present study reports the results of high-resolution free surface Unsteady Reynolds Averaged Navier-Stokes (URANS) simulations of the three-dimensional (3D) flow field in a rectangular pump intake system. The numerical simulations are composed of various scenarios without/with various anti-vortex devices (AVDs) to suppress the surface and subsurface vortices around the pipe. For this purpose, after performing a comparison between the streamlines of a benchmark test case and the data available in the literature, the 3D vortical structures around the pipe and inside of the basin have been visualized using the Q-criterion. In addition, the circulation and swirl angle indices inside the pipe are implemented for evaluating the performance of different types of AVDs. The results showed that the surface vortices cause low frequency oscillations in the pump inlet. In this case, the use of a curtain wall controls the surface vortices and eliminates low frequency and high amplitude oscillations in the pump inlet. Examining various cases with AVDs shows that none of the scenarios with AVDs could fully control the surface and submerged vortices. Due to this fact, a novel geometry for the pump basin is introduced which suppresses the entire free surface, submerged and floor vortices.

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“…Moreover, Turbomachinery Society of Japan [11] has revised the standard of pump sump model test and the revised standard examined the possibility of numerical analysis for the prediction of the flow in the sump model using several commercial and in-house CFD codes. Kim et al [12] examined the flow uniformity according to the flow distribution in the pump intake channel to find out the cause of vortex occurrence in detail by experiment and CFD analyses. The main concern and challenge in this study is to investigate the effect of low suction water levels on the hydraulic performance of axial flow pumping stations.…”

Section: Introductionmentioning

confidence: 99%

CFD Technique for Solving Low Water Level Problem of Axial Flow Pumps

El-Shaikh¹

2017

AJWSE

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Abstract:In this paper, water levels variation in the sump intake is studied in El-SHABAB Pumping Station. ANSYS Ver.17.1 flow simulation software is used to simulate the flow conditions to overcome decreasing water level in the low demands period, winter closure. Seven scenarios are studied to obtain the best one to apply it at that condition. Case 1 represents the optimum design when the submergence water level is 5m above the sump floor and the length of submersed part in the sump is 3.5m. Case 2 represents the winter closure period where the submergence water level decreased by 1.5m to become 3.5m in the period winter closure and the length of submersed part in the sump is 2m. As a result, velocity in the suction pipe decreased 26%, a swirl angle 10.79° is attained, and vibration level increased 4 times representing hydraulic and dynamic problems. Case 3 is done by adding a joint with length 0.5m to the submersed part of pipe. Case 4 is done by increasing a joint length by 1m to the submersed part of pipe. Case 5 is done by adding a cone under the bell mouse with height 1m and with the same pipe diameter. Case 6 is done by adding a cone under the bell mouse with height 1m and 0.5m joint leading to increase the submersed part of pipe to become 2.5m. Case 7 is done by repeating case 6 with increasing water submerging level after finishing the period of winter closure where the water level in the sump is 5m. The results indicate that, during the period of winter closure, Case 6 is the best condition to use where it prevents vortex and has the best swirling angle 5.12° with no turbulence is observed at the entrance of the pump improving the dynamic and hydraulic performance of the pump. Also, the results indicate that Case 7 after finishing the period of winter closure and water level returned to become 5m (optimum design) is the best condition to use during all seasons where it prevents vortex and has the best swirling angle 4.66°.

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A study on the effectiveness of an anti vortex device in the sump model by experiment and CFD

Cited by 19 publications

References 5 publications

Active Flow Control of a Pump-Induced Wall-Normal Vortex With Steady Blowing

Active Flow Control of a Pump-Induced Wall-Normal Vortex With Steady Blowing

Numerical study of the surface and subsurface vortices suppression in a rectangular pump basin using anti‐vortex devices

CFD Technique for Solving Low Water Level Problem of Axial Flow Pumps

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