Analysis of Unsteady Flow Velocity Fields Inside the Impeller of a Radial Flow Pump: PIV Measurements and Numerical Calculation Comparisons

Cavazzini, Giovanna; Dupont, Patrick; Pavesi, Giorgio; Bois, Gérard; Atif, Abdelmadjid; Cherdieu, Patrick

doi:10.1115/ajk2011-22055

Cited by 6 publications

(4 citation statements)

References 5 publications

(3 reference statements)

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“…Flow in radial pumps is highly three-dimensional, spatially non-uniform, intrinsically unsteady, and departs from axisymmetric or periodic assumptions, which were strongly highlighted by previous works [1][2][3][4]. Moreover, due to the rotor stator interaction effect, the diffuser vanes play a major role in establishing circumferential flow fields near the exit of the impeller, as shown by several studies [5][6][7][8]. However, unsteady effect may fundamentally change the loss inside the diffuser is still uncertain.…”

Section: Introductionmentioning

confidence: 99%

Static pressure recovery analysis in the vane island diffuser of a centrifugal pump

Dupont

Bayeul-Lainé

et al. 2016

J Mech Sci Technol

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This is an author-deposited version published in: https://sam.ensam.eu Handle ID AbstractThe overall performance of a vane-island type diffuser of a centrifugal pump model was obtained by means of directional probe traverses. These measurements were performed in an air model of a real hydraulic pump for five volume flow rates. Directional probe traverses are performed with a classical three-hole probe to cover most of the complete inlet section of the diffuser from hub to shroud and from pressure to suction side. Existing Particle image velocimetry (PIV) measurement results are also used to compare probe measurement results between the inlet and outlet throats of vane island diffuser at mid-span. Some assistance from already existing unsteady calculation, including leakage effects, is used to evaluate the numerical approach capability and to correctly define the mean initial conditions at impeller's outlet section. Pressure recovery and the measured total pressure loss levels inside this particular vane diffuser geometry are then calculated. Detailed analysis of the flow structure at the inlet section of the vane island diffuser is presented to focus on pressure evolution inside the entire diffuser section for different flow rates. The combined effects of incidence angle and blockage distributions along hub to shroud direction are found to play an important role on loss distribution in such a diffuser.

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Section: Introductionmentioning

confidence: 99%

Static pressure recovery analysis in the vane island diffuser of a centrifugal pump

Dupont

Bayeul-Lainé

et al. 2016

J Mech Sci Technol

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“…The test ring used for the three-hole probe (Figure 2) was the same as the one already developed for the PIV measurement already described in the previous papers, especially in reference [5]. Test pump model and PIV measurements conditions have been already described in several papers [3][4][5][6][7] and main pump characteristics are given in Table 1. (Figure 3).…”

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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“…This work is an extended study that had originated in LML laboratory concerning the well-known SHF (Société Hydrotechnique de France) pump. 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%

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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International audienceThis 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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Analysis of Unsteady Flow Velocity Fields Inside the Impeller of a Radial Flow Pump: PIV Measurements and Numerical Calculation Comparisons

Cited by 6 publications

References 5 publications

Static pressure recovery analysis in the vane island diffuser of a centrifugal pump

Static pressure recovery analysis in the vane island diffuser of a centrifugal pump

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

Leakage Flow Influence on SHF pump model performances

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