Enhancement of vorticity reduction by floor splitter in pump sump to improve pump efficiency

Norizan, Tajul Ariffin; Reda, E.; Harun, Zambri

doi:10.1016/j.seta.2017.06.001

Cited by 17 publications

(11 citation statements)

References 10 publications

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“…Probability of the formation of cavitation due to the concentrated vortices is too high. e vorticity distribution near the branch entrance exhibited high values due to the cylindrical shape of the bottom outlet which contributed to high amount of flow separation [43,44]. e transient flow features associated with a moving gate were successfully captured as well as the discharge characteristic for partial opening of the gate.…”

Section: Pressure Values In the Bottom Outlet's Tunnel Of Sardabmentioning

confidence: 99%

Hydrodynamic Performance and Cavitation Analysis in Bottom Outlets of Dam Using CFD Modelling

Yamini

Mousavi

Kavianpour

et al. 2021

Advances in Civil Engineering

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Bottom outlets are significant structures of dams, which are responsible for controlling the flow rate, operation, or removal of reservoir sedimentation. The service gate controls the outlet flow rate, and whenever this gate is out of order, the emergency gate which is located at upstream is utilized. The cavitation phenomenon is one of the common bottom outlets’ problems due to the rapid flow transfer. The present research is a numerical study of the flow pattern in a dam’s bottom outlet for different gate openings by the use of Flow-3D software and RNG k-ε turbulence model. The investigation is carried out on the Sardab Dam, an earth dam in Isfahan (Iran). The maximum velocity for 100% opening of the gate and Howell Bunger valve is about 18 m/s in the section below the gate, and the maximum velocity for 40% opening of the gate is equal to 23.1 m/s. For 50% opening of the service and emergency gate in the valve’s upstream areas, the desired pressure values are reduced. Moreover, in the areas between the two emergency and service gates, the pressure values are reduced. The possibility of cavitation in this area can be reduced by installing aerators. The flow pattern in Sardab Dam’s bottom outlet has relatively stable and proper conditions, and there are no troublesome hydraulic phenomena such as local vortices, undesirable variations in pressure, and velocity in the tunnel, and there is no flow separation in the critical area of flow entering into the branch.

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Section: Pressure Values In the Bottom Outlet's Tunnel Of Sardabmentioning

confidence: 99%

Hydrodynamic Performance and Cavitation Analysis in Bottom Outlets of Dam Using CFD Modelling

Yamini

Mousavi

Kavianpour

et al. 2021

Advances in Civil Engineering

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“…However, these studies merely used physical model tests to study individual engineering, and their results are not universal. In addition, studies on vortex elimination measures in the pump sump have shown that although the anti-vortex device [13,14] is worthy of attention, this technology still lacks maturity and has certain limitations; hence, it cannot be widely applied in pump station engineering.…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism of an Adherent Vortex in the Side Pump Sump of a Pumping Station

Wang¹,

Lü²

2021

Int. j. simul. model.

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The inflow of the side pump sump is not smooth enough during the operation of a pumping station, resulting in an asymmetric adherent vortex that endangers the station's normal operation and safety. To solve this problem, flow field and vorticity distribution charts of different flow layers were created through the establishment of a numerical model of the pumping station inflow by means of the fluid simulation software. The formation mechanism of the asymmetric adherent vortex in the side pump sump was analysed by combining Reynolds shear stress distribution, the simplified Navier-Stokes equation, and the transport equation of turbulent kinetic energy. Furthermore, the accuracy of the numerical simulation results was verified using flow field data collected via particle image velocimetry at the junction of the forebay and pump sumps of the station. Results show that the distribution of inflow velocity is uneven due to the asymmetric friction of the inflow in the side pump sump. The transverse velocity formed from it generates the asymmetric vortex in the side pump sump and creates an inspiratory vortex.

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“…Although vortices may occur in dry pit installation as well, the effects are more detrimental for the wet pit installation due to the fact that the pump inlet is submerged in water and therefore the vortices can directly come in contact with the pump impeller and cause damages which will affect the pump performance [1]. This work will complement vortex-reduction effort in intake pipe which eventually affect impeller and pump performance [2]. There are guidelines proposed by organizations related to pump intake design such as ANSI [3], BSI [4] and JSME [5] which could help eliminate or at least control the formation of vortices in pump sump.…”

Section: Introductionmentioning

confidence: 99%

Subsurface Vortex Control Parametric Study at Submersible Pump Intake Using Plate-Type Floor Splitters

Norizan

Harun

Abdullah

et al. 2020

ARFMTS

Self Cite

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Vortex formation near the pump inlet in the sump during intake is a phenomenon that needs to be controlled to maximize the pump efficiency. In this study, five variants of an AVD type called the plate type floor splitter are installed in a single intake pump sump model to evaluate the effect of geometry of the floor splitter on the effectiveness of vortex control in the intake flow. The acceptance criteria according to ANSI HI 9.8 2012 standard are that the vortex formed in the sump must be eliminated and the swirl angle in the flow must not exceed 5°. The submergence of the inlet was varied to observe the swirl reduction effect at different water levels. All floor splitter variants employed in this study have successfully eliminated the vortex but most of them did not manage to reduce the swirl angle below 5° as required. The variants with different heights displayed significant differences in swirl angle values with higher variants produce greater swirl angle reduction. The highest floor splitter variant managed to produce a swirl angle reduction below 5°. With varying lengths, however, the swirl angle values did not differ much in each case with the installation of the floor splitter variants. The advantage of the long floor splitter is that the fluctuation of swirl angle values is minimum for all submergence depths greater than 0.9 times the minimum inlet submergence which implies that the swirl reduction effect is less affected by the change in water level. By combining the advantages of both floor splitter design variation, the optimal design of plate type floor splitter can be achieved.

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Enhancement of vorticity reduction by floor splitter in pump sump to improve pump efficiency

Cited by 17 publications

References 10 publications

Hydrodynamic Performance and Cavitation Analysis in Bottom Outlets of Dam Using CFD Modelling

Hydrodynamic Performance and Cavitation Analysis in Bottom Outlets of Dam Using CFD Modelling

Formation Mechanism of an Adherent Vortex in the Side Pump Sump of a Pumping Station

Subsurface Vortex Control Parametric Study at Submersible Pump Intake Using Plate-Type Floor Splitters

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