Investigation of CFD calculation method of a centrifugal pump with unshrouded impeller

Wu, Dazhuan; Yang, Shuai; Xu, Bingbing; Qiao-ling, Liu; Wu, Peng; Wang, Leqin

doi:10.3901/cjme.2014.02.376

Cited by 9 publications

(3 citation statements)

References 15 publications

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“…Increasing concentration has been put on the sidewall gap flow field in centrifugal pumps because of the improved requirement in calculation accuracy. Previous studies have confirmed that the clearance flow in the sidewall gaps, sensitive to the clearance size, is able to influence the pump performance (Engeda, 1995; Shukla and Kshirsagar, 2007; Li, 2012; Wu et al , 2014; Cao et al , 2015). Moreover, experiments and simulations also indicate that the clearance flow contributes substantially to the rotordynamic forces, especially the radial force and axial thrust on the impeller (Adkins and Brennen, 1988; Uy and Brennen, 1999; Park and Morrison, 2009; Will et al , 2012; Nishi and Fukutomi, 2014; Liu et al , 2014).…”

Section: Introductionmentioning

confidence: 89%

Pressure fluctuation characteristics in the sidewall gaps of a centrifugal dredging pump

Cao

Xiao

Wang

et al. 2017

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Purpose The purpose of this paper is to study the pressure fluctuation characteristics in the sidewall gaps of a centrifugal dredging pump in detail and discover the excitation sources. Design/methodology/approach An unsteady numerical simulation with shear–stress transport–scale-adaptive simulation (SAS-SST) model was conducted for a centrifugal pump considering the sidewall gaps. The numerical codes were validated by a model test carried out in China Water Resources Beifang Investigation, Design and Research Co., Ltd. Fast Fourier transform was used to obtain the frequency components of the pressure fluctuation. Findings Pressure fluctuation characteristics inside the pump were analyzed for a condition near the design point. In the sidewall gaps, the circumferential, radial and axial distribution of the pressure fluctuation amplitude follow different laws. The non-axisymmetrical distribution of pressure fluctuation in the sidewall gaps shows that the unsteady flow in the volute casing which has a non-axisymmetrical geometry imposes an evident effect on the flow field in the sidewall gaps and the interaction between the main flow and the clearance flow cannot be neglected. There are several frequency components appearing as the dominant frequencies at different locations in the sidewall gaps, but the relatively stronger pressure fluctuations are all dominated by the rotating frequency. It indicates that the rotating impeller, which originally makes the shrouds rotate, is the primarily excitation source of the pressure fluctuations in the sidewall gaps. Originality/value The pressure fluctuation characteristics in the sidewall gaps of centrifugal pumps were first comprehensively analyzed. Unsteady flows in the sidewall gaps should be considered during the design and operation of centrifugal pumps.

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Section: Introductionmentioning

confidence: 89%

Pressure fluctuation characteristics in the sidewall gaps of a centrifugal dredging pump

Cao

Xiao

Wang

et al. 2017

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“…The pressurevelocity coupling was calculated using the SIMPLEC algorithm. The momentum, turbulence kinetic energy and dissipation rate equations were dispersed by second-order upwind (González, 2002;Wu, 2014). The inlet velocity-was imposed at the inlet and the outflow boundary condition was given at the outlet.…”

Section: Calculation Methods and Monitoring Pointsmentioning

confidence: 99%

Effect of Reflux Hole on the Transient Flow Characteristics of the Self-Priming Sewage Centrifugal Pump

Zhou

Mou

et al. 2019

JAFM

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The reflux hole has a large effect on the performance of self-priming centrifugal pumps. In order to study the effects of the reflux hole on the performance and transient flow characteristics of the self-priming centrifugal pump, four different areas of the reflux hole inside an external mixed self-priming pump were proposed. The 3D transient flow was numerically simulated under different operating conditions for the investigated pump. The differential pressure, reflux quantity and transient flow characteristics near the reflux hole were analysed, and then the effects of the reflux hole area on the pressure fluctuation characteristics and performance of the pump were further researched. The results show that the differential pressure and reflux quantity is zero around the best-efficiency point. The vorticity magnitude near the exit of the reflux hole is significant, and the unsymmetrical flow structures represent periodic motion over time in the cross-section. The pressure fluctuation intensities of monitoring points P2-P5 upstream of the reflux hole were generally larger than others and decreased with a decrease in reflux hole area. With a decrease of the reflux hole area, the performance of the pump improved to some extent.

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“…The detailed flow characteristics have been discussed using different numerical methods. [25][26][27][28] In general, Reynolds-averaged Navier Stokes (RANS) methods are widely applied to obtain the complex flow characteristics in the pump, 25 and some of the recent researches on simulation with RANS are shown in literature, [26][27][28] where different turbulence models have been adopted in the simulation. Presently, due to the fact that Large Eddy Simulation (LES) and Detached Eddy Simulation (DES) are capable to capture the sub-grid scale vortex, they are usually employed to simulate the full-scale flow characteristics at small flow rates.…”

Section: Introductionmentioning

confidence: 99%

Performance improvement of a high-speed aero-fuel centrifugal pump through active inlet injector

Wang

Wang³

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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This paper presents a high-speed aero-fuel centrifugal pump with an active inlet injector for an aero-engine aiming at regulating the internal flow field and improving overall hydraulic performance. Unlike most of the existing centrifugal pumps for aero-engines, an injector is designed and integrated with the pump to accomplish the active flow control. Firstly, by employing the energy equation in the pump, reasonable geometrical parameters of the injector are calculated. Then, a validation study is conducted with three known turbulence models, showing that simulations with the RNG κ- ε turbulence model can accurately predict the head and efficiency of the experimental pump. Finally, simulation results with the determined turbulence model are discussed. The results show that the static pressure is uniformly distributed inside the impeller, the volute and the injector. The flow field is significantly ameliorated by improving the pressure inside the suction pipe and controlling the flow direction via the injector. Furthermore, the head and efficiency of the designed pump with an active inlet injector are improved compared to the one without an injector.

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Investigation of CFD calculation method of a centrifugal pump with unshrouded impeller

Cited by 9 publications

References 15 publications

Pressure fluctuation characteristics in the sidewall gaps of a centrifugal dredging pump

Pressure fluctuation characteristics in the sidewall gaps of a centrifugal dredging pump

Effect of Reflux Hole on the Transient Flow Characteristics of the Self-Priming Sewage Centrifugal Pump

Performance improvement of a high-speed aero-fuel centrifugal pump through active inlet injector

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