Comparisons RANS and URANS numerical results with experiments in a vaned diffuser of a centrifugal pump

Bayeul-Lainé, Annie-Claude; Dupont, Patrick; Cavazzini, Giovanna; Pavesi, Giorgio; Cherdieu, Patrick; Bois, Gérard; Roussette, Olivier

doi:10.1051/lhb/20150026

Cited by 5 publications

(7 citation statements)

References 17 publications

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“…At low values of Q*, a positive leakage between impeller and diffuser was observed. At high values the tendency inverses as shown in figures 10 and 11.These tendencies were also observed in previous studies [7].…”

Section: Results and Analysissupporting

confidence: 89%

“…Three-dimensional incompressible Reynolds averaged Navier-Stokes equations are solved in steady (frozen rotor) and unsteady states. The SST k-ω turbulence model is used [7,18].…”

Section: Three Holes Probesmentioning

confidence: 99%

“…A lot of experimental data have already been produced (tests in air and in water) on that geometry and these results are used as databases for the validation of numerical calculation results and for new experimental results [1][2][3][4][5][6][7][8] Flow behaviour in a radial machine is quite complex and strongly depends on rotor stator interactions and operating conditions [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Leakage Flow Influence on SHF pump model performances

Dupont¹,

Bayeul-Lainé²,

Bois³

et al. 2015

International Journal of Fluid Machinery and Systems

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This paper deals with the influence of leakage flow existing in SHF pump model on the analysis of internal flow behaviour inside the vane diffuser of the pump model performance using both experiments and calculations. PIV measurements have been performed at different hub to shroud planes inside one diffuser channel passage for a given speed of rotation and various flow rates. For each operating condition, the PIV measurements have been trigged with different angular impeller positions. The performances and the static pressure rise of the diffuser were also measured using a three-hole probe. The numerical simulations were carried out with Star CCM+ 9.06 code (RANS frozen and unsteady calculations). Some results were already presented at the XXth IAHR Symposium for three flowrates for RANS frozen and URANS calculations. In the present paper, comparisons between URANS calculations with and without leakages and experimental results are presented and discussed for these flow rates. The performances of the diffuser obtained by numerical calculations are compared to those obtained by the three-holes probe measurements. The comparisons show the influence of fluid leakages on global performances and a real improvement concerning the efficiency of the diffuser, the pump and the velocity distributions. These results show that leakage is an important parameter that has to be taken into account in order to make improved comparisons between numerical approaches and experiments in such a specific model set up.

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Section: Results and Analysissupporting

confidence: 89%

“…Three-dimensional incompressible Reynolds averaged Navier-Stokes equations are solved in steady (frozen rotor) and unsteady states. The SST k-ω turbulence model is used [7,18].…”

Section: Three Holes Probesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Leakage Flow Influence on SHF pump model performances

Dupont¹,

Bayeul-Lainé²,

Bois³

et al. 2015

International Journal of Fluid Machinery and Systems

Self Cite

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show abstract

“…Due to the specific model set-up, the effects of fluid leakage gap between the rotating and fixed part of the pump model are unusual and have been analysed and discussed (Bayeul-Lainé et al [10]). Two sources of fluid leakage occur: i-the first one at the impeller inlet (leakage 1, Figure 6, axial clearance = 1mm), ii-the second one between the impeller outlet and the diffuser inlet both for the hub and the shroud sides (leakages 2 and 3, Figure 6, radial clearance = 1mm).…”

Section: Calculationsmentioning

confidence: 99%

“…Because of the leading edge shape of the vaned diffuser combined with the rather small value of the vaneless radius ratio (R 3 /R 2 =1.068) of the pump model, non-uniform flow structures are quite present and strong as shown by Si et al [8]. A deeper analysis from Bayeul-Lainé et al [9][10][11] and from Dupont et al [12] has also shown that unusual leakage effects occur in the present experimental model, the effects of which may also affect the diffuser performances.…”

Section: Introductionmentioning

confidence: 99%

Investigations inside a vaned diffuser of a centrifugal pump at low flowrates.

Bayeul-Lainé

Dupont

Bois

2016

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. This paper focuses on the unsteady flow behaviour inside the vaned diffuser of a radial flow pump model, operating at partial flowrates (0.387Q i , 0.584Q i and 0.766Q i where Q i is the impeller design flowrate).The effects of the leakage flows are taken into account in the analysis. PIV measurements have been performed at different hub to shroud planes inside one diffuser channel passage for a given speed of rotation, for several flowrates and different angular impeller positions. The performances and the static pressure rise of the diffuser were also measured using a three-holes probe in the same experimental conditions. The unsteady numerical simulations were carried out with Star CCM+ 10.02 code with and without leakage flow. The PIV measurements showed a high unsteadiness at very low flowrate which was confirmed by the numerical calculations. In previous studies it has been shown that the global performances, as the efficiencies are in good agreement between calculations and measurements. In this paper, a joint analysis of measurements and numerical calculations is proposed to improve the understanding of the flow behaviour in a vaned diffuser.

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