Numerical and experimental comparison of the vaned diffuser interaction inside the impeller velocity field of a centrifugal pump

Atif, Abdelmadjid; Benmansour, Saad; Bois, Gérard; Dupont, Patrick

doi:10.1007/s11431-010-4260-5

Cited by 23 publications

(7 citation statements)

References 7 publications

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“…In the process of impeller acceleration, the change rule of rotating speed is uploaded to FLUENT by programming user-defined function (UDF) according to the equation (1). The calculation selects RNG k-e turbulence model in eddy viscosity models, which is verified to high efficiency simulate the flow with high revolution rate and curvature.…”

Section: Computational Modelmentioning

confidence: 99%

“…Since the invention of impeller machinery, scholars at home and abroad made in-depth and detailed studies to improve its overall performance. However, almost all the researches are carried out under steady working conditions, [1][2][3][4] while there are few studies on performance of impeller machinery under mutational working condition, such as abrupt start-up, power outage, and rapidly regulating discharge valve opening, etc. Meanwhile, the transient processes that often cause equipment failure exist inevitably.…”

Section: Introductionmentioning

confidence: 99%

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Numerical methods study of solving transient flow of impeller machinery under mutational working conditions

Zhang

Zhu

Zhou

et al. 2018

The Journal of Computational Multiphase Flows

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The transient performances of impeller machinery under typical mutational working conditions play an important role in the area of engineering and have attracted extensive attention. In order to fully understand transient behaviors of impeller machinery under mutational working conditions, it is very necessary to confirm an efficient and reliable solving method. In this paper, the dynamic mesh method and the sliding mesh method are respectively used to be solved the inner transient flow of a 2D centrifugal pump model during abrupt start-up period. The Renormalization-group (RNG) k-e turbulence model in eddy viscosity models is chosen to close the Reynolds-average equation and to complete the turbulence calculation. Moreover, the SIMPLE algorithm is also adapted to accomplish the coupling calculation between velocity and pressure. The study shows that in theory, the most appropriate method to solve transient flow is the dynamic mesh method, but it has the shortage of low mesh quality during mesh reconstruction. The sliding mesh method with high mesh quality is an ideal solving method under mutational working conditions. In general, both of the methods would reflect the basic characteristics of inner flow, while the sliding mesh method has higher solution precision.

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Section: Computational Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical methods study of solving transient flow of impeller machinery under mutational working conditions

Zhang

Zhu

Zhou

et al. 2018

The Journal of Computational Multiphase Flows

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“…It also gives an incorrect advection of the impeller wakes in the vaned diffuser. It is a fast preliminary method, however, and gives satisfying results in the radial gap between the impeller and diffuser [20] that can also serve as a good initial condition for unsteady simulations. The second rotor-stator interaction method resolves the flow unsteadiness using a sliding grid approach.…”

Section: Computational Domain and Numerical Setupmentioning

confidence: 99%

Numerical Investigations of Unsteady Flow in a Centrifugal Pump with a Vaned Diffuser

Petit

Nilsson

2013

International Journal of Rotating Machinery

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Computational fluid dynamics (CFD) analyses were made to study the unsteady three-dimensional turbulence in the ERCOFTAC centrifugal pump test case. The simulations were carried out using the OpenFOAM Open Source CFD software. The test case consists of an unshrouded centrifugal impeller with seven blades and a radial vaned diffuser with 12 vanes. A large number of measurements are available in the radial gap between the impeller and the diffuse, making this case ideal for validating numerical methods. Results of steady and unsteady calculations of the flow in the pump are compared with the experimental ones, and four different turbulent models are analyzed. The steady simulation uses the frozen rotor concept, while the unsteady simulation uses a fully resolved sliding grid approach. The comparisons show that the unsteady numerical results accurately predict the unsteadiness of the flow, demonstrating the validity and applicability of that methodology for unsteady incompressible turbomachinery flow computations. The steady approach is less accurate, with an unphysical advection of the impeller wakes, but accurate enough for a crude approximation. The different turbulence models predict the flow at the same level of accuracy, with slightly different results.

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“…Extensive experimental and numerical work has been conducted on a special pump model that works with air at the Laboratoire de Mécanique de Lille (LML, France). Several papers have also been published [10][11][12][13][14]. The frozen rotor technique has been proven to be able to capture parts of the real flow characteristics of the impeller itself and cannot be used to obtain overall pump performances near design points even with reliable mesh configurations.…”

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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Numerical and experimental comparison of the vaned diffuser interaction inside the impeller velocity field of a centrifugal pump

Cited by 23 publications

References 7 publications

Numerical methods study of solving transient flow of impeller machinery under mutational working conditions

Numerical methods study of solving transient flow of impeller machinery under mutational working conditions

Numerical Investigations of Unsteady Flow in a Centrifugal Pump with a Vaned Diffuser

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

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