Experimental and numerical investigation of the transient characteristics and volute casing wall pressure fluctuations of a single-blade pump

Melzer, Steffen; Müller, Tim M.; Schepeler, Stephan; Kalkkuhl, Tobias; Skoda, Romuald

doi:10.1177/0954408918780524

Cited by 12 publications

(10 citation statements)

References 24 publications

(28 reference statements)

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“…While numerous studies have investigated the pressure fluctuation and unsteady characteristics in different kinds of pumps, which includes the effects of working conditions [14,16], inlet guide vanes [17], tip clearance [18], and volute curvature [19][20][21], but the influence of the number of diffuser vanes on the pressure fluctuation in the centrifugal pump is unclear and further investigation is needed. So, in this paper a numerical approach was adopted in a centrifugal pump with a different number of diffuser vanes, and the pressure fluctuations are analyzed and compared in detail.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Pressure Fluctuation and Unsteady Flow in a Centrifugal Pump

et al. 2019

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A pump is one of the most important machines in the processes and flow systems. The operation of multistage centrifugal pumps could generate pressure fluctuations and instabilities that may be detrimental to the performance and integrity of the pump. In this paper, a numerical study of the influence of pressure fluctuations and unsteady flow patterns was undertaken in the pump flow channel of three configurations with different diffuser vane numbers. It was found that the amplitude of pressure fluctuation in the diffuser was increased gradually with the increase in number of diffuser vanes. The lower number of diffuser vanes was beneficial to obtain a weaker pressure fluctuation intensity. With the static pressure gradually increasing, the effects of impeller blade passing frequency attenuated gradually, and the effect of diffuser vanes was increased gradually.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of Pressure Fluctuation and Unsteady Flow in a Centrifugal Pump

et al. 2019

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“…The residuals for continuity and momentum drop at least five orders of magnitude, while variations in global mass flow imbalance and averaged bulk output quantities between successive revolutions are below 1%. A similar approach was adopted by Melzer et al, 26 suggesting that these considerations offer adequate confidence in the numerical solution. The CFD software used for the numerical simulations was ANSYS FLUENT 19.2.…”

Section: Mesh and Numerical Setupmentioning

confidence: 97%

“…For this reason, the error bars around the experimental data are larger than would be expected from a well-controlled laboratory experiment. 26 The values from the numerical simulations are averaged over the final revolution. Figure 5(a) shows the head-discharge curve.…”

Section: Effect Of the Gap On Pump Performancementioning

confidence: 99%

Effect of the axial gap on the energy consumption of a single-blade wastewater pump

Caruso

Meskell

2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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The effect of the axial gap on the energy consumption of a single-blade wastewater pump (Sulzer XFP PE-2 150E CB1.1) is assessed using unsteady Reynolds-averaged Navier–Stokes simulations with ANSYS Fluent. The numerical model was compared to experimental data with a nominal design configuration (i.e. gap size) to provide confidence in the modeling approach. The global performance of the pump was evaluated in terms of pressure-discharge, torque, and efficiency for a range of volumetric flow rates (110 m3ċh−1 to 254 m3ċh−1) and gap sizes (0.3 mm to 1.15 mm). While it is found that the power consumption at a given flow rate is reduced with increased gap, this is at the expense of a drop in outlet pressure, and hence the efficiency of the pump drops significantly. At the largest volumetric flow rate considered (254 m3ċh−1), the sensitivity of the efficiency to the gap size is −13.5%ċmm−1 and the sensitivity of the reduction in mechanical power consumption to gap size is 0.58 kWċmm−1. These results emphasize the importance of active maintenance during the lifetime of a wastewater pump to avoid a reduction in the energy performance caused by increased gap size.

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“…16(b)), the measured head curve is only qualitatively captured, since the experimental data is numerically under-predicted. This underestimation is at first glance unexpected since several authors experienced an over-prediction of pump head in the simulation of centrifugal pumps, e.g., Barrio et al (2010), Limbach and Skoda (2017), and Melzer et al (2019), which is assumed to be attributed to the neglect of roughness effects in the simulation or the simulation's limitation of resolving secondary flows, e.g., flow separation. However, in other studies also an underestimation of experimental data is observed, which is assumed to occur mainly due to limitations of both the numerical grid and the turbulence model, e.g., Zhang et al (2018) and Perissinotto et al (2019).…”

Section: Grid Studymentioning

confidence: 99%

3D simulation of gas-laden liquid flows in centrifugal pumps and the assessment of two-fluid CFD methods

Hundshagen

Mansour

Skoda

2020

Exp. Comput. Multiph. Flow

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An assessment of a two-fluid model assuming a continuous liquid and a dispersed gas phase for 3D computational fluid dynamics (CFD) simulations of gas/liquid flow in a centrifugal research pump is performed. A monodisperse two-fluid model, in conjunction with a statistical eddy-viscosity turbulence model, is utilized. By a comprehensive measurement database, a thorough assessment of model inaccuracies is enabled. The results on a horizontal diffuser flow reveal that the turbulence model is one main limitation of simulation accuracy for gas/liquid flows. Regarding pump flows, distinctions of single-phase and two-phase flow in a closed and semi-open impeller are figured out. Even single-phase flow simulations reveal challenging requirements on a high spatial resolution, e.g., of the rounded blade trailing edge and the tip clearance gap flow. In two-phase pump operation, gas accumulations lead to coherent gas pockets that are predicted partly at wrong locations within the blade channel. At best, a qualitative prediction of gas accumulations and the head drop towards increasing inlet gas volume fractions (IGVF) can be obtained. One main limitation of two-fluid methods for pump flow is figured out in terms of the violation of the dilute, disperse phase assumption due to locally high disperse phase loading within coherent gas accumulations. In these circumstances, bubble population models do not appear beneficial compared to a monodisperse bubble distribution. Volume-of-Fluid (VOF) methods may be utilized to capture the phase interface at large accumulated gas cavities, requiring a high spatial resolution. Thus, a hybrid model, i.e., a dispersed phase two-fluid model including polydispersity for flow regions with a dilute gas phase, should be combined with an interphase capturing model, e.g., in terms of VOF. This hybrid model, together with scale-resolving turbulence models, seems to be indispensable for a quantitative two-phase pump performance prediction.

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Experimental and numerical investigation of the transient characteristics and volute casing wall pressure fluctuations of a single-blade pump

Cited by 12 publications

References 24 publications

Numerical Study of Pressure Fluctuation and Unsteady Flow in a Centrifugal Pump

Numerical Study of Pressure Fluctuation and Unsteady Flow in a Centrifugal Pump

Effect of the axial gap on the energy consumption of a single-blade wastewater pump

3D simulation of gas-laden liquid flows in centrifugal pumps and the assessment of two-fluid CFD methods

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