Flow Analysis in a Pump Diffuser—Part 2: Validation and Limitations of CFD for Diffuser Flows

Muggli, F.; Eisele, Klaus; Casey, Michael; Gülich, Johann Friedrich; Schachenmann, A.

doi:10.1115/1.2819526

Cited by 19 publications

(4 citation statements)

References 7 publications

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“…The numerical results presented in this section are obtained with the commercial CFD software CFX-TASCFlow 2.12 developed by CFX of Ansys Canada. The previous versions of this code have been intensively used for turbomachinery flow calculation and validated for pumps application [26,27] but not for inducer cavitating flows. The validation of the cavitation model implemented in CFX-TASCFlow 2.12 was performed at various flow rates, on the cavitating behaviour of the BH inducer designed and tested at LEMFI-Paris [1,28].…”

Section: Computational Methodologymentioning

confidence: 99%

Hub shape effects on the inducers performance under cavitation

Mejri

Bakir

Kouidri

et al. 2006

Proceedings of the Institution of Mechanical Engineers, Part A:

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In this work, experimental and three-dimensional numerical simulations are pursued with the intent of elucidating the differences that the hub shape has on three inducer performances and on other important engineering properties in cavitating and non-cavitating regimes. Two inducers have a cylindrical hub and the third one has a conical hub. They are noted as BH inducer (big hub), SH inducer (small hub), and CH inducer (conical hub). These machines were designed with the goal to reduce the amount of cavitation and vibration, on the one hand, and to improve the overall performance, on the other hand. Both sets of experimental and numerical data suggest that the cavitating and non-cavitating performances are affected by changes in the hub shape. The hub configuration and cavitation numbers considered give rise to various cavitation structures on the suction side of the blades, characterized — at some flow rates — by recirculating flow regions and backflow vortices. The results show the relative superiority of the CH inducer through the critical cavitation coefficient of 5 per cent, even if this inducer is very unstable for all flow rates. It was also found that the BH inducer is the most stable and that for a 15 per cent head drop, the three inducers have quite the same performances. The main experimental and numerical results presented here concern the overall performances, especially the hydrodynamic mechanism of head drop and the visualization of three-dimensional flow structures. We also present the vibratory behaviour versus the flow rate and the suction pressure. The computational three-dimensional flow in non-cavitating regimes enabled us to explain the unstable and cavitating operation for off-design conditions. The numerical computation in cavitating flows is carried out using the computational fluid dynamics (CFD) software CFX-TASCFlow2.12, which cavitation model was validated on our BH inducer.

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Section: Computational Methodologymentioning

confidence: 99%

Hub shape effects on the inducers performance under cavitation

Mejri

Bakir

Kouidri

et al. 2006

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…With the increasing requirements for the operation stability of centrifugal pumps in industrial and agricultural production, the research on the internal pressure pulsation and radial force of centrifugal pumps has always been the focus and hot issue of the current research [24][25][26][27][28]. In this paper, ANSYS CFX numerical simulation software is used to simulate a certain type of guide vane of centrifugal pump with inconstant value, and it is verified by experiment.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Research on Radial Force of Centrifugal Pump with Guide Vanes

Meng

Jiang²,

Deng

et al. 2021

Shock and Vibration

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To reveal the internal unsteady flow state of the guide vane centrifugal pump, in this paper, the standard SST k‐ω turbulent flow model is used for unsteady numerical simulation of the centrifugal pump. The characteristics of the flow field inside the centrifugal pump are analyzed, the resultant force and vector distribution of the radial force of the guide vane and impeller of the centrifugal pump under different flow rates are obtained, which were verified by experiments. The results show that the main reason of radial force of the impeller is the pressure asymmetry in each flow passage. The radial force will show periodic fluctuations due to the rotor-stator interference between the impeller and the guide vanes under different flow rates. The radial force on the impeller decreases gradually with the increase of the flow, the distribution is hexagonal or hexagonal shape, and the number of impeller blades is the same. The results can provide reference for the design of impeller and guide vane of centrifugal pump.

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“…As an effort to improve on the previously mentioned practice, some designers assume a constant flow in the diffusers and the other design variables are taken at average values (Muggli et al 1997). Nevertheless, the general consensus is that are must resort to methods based on computer simulations such as computational fluid dynamics (CFD).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of LPG Density on the Performance of a Centrifugal Pump-Impeller Through CFD Simulations

Lara-Rodriguez

Begovich

Naredo

2015

SPE Latin American and Caribbean Petroleum Engineering Conference

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This paper deals with the performance analysis of a centrifugal pump-impeller of diffuser type for transporting liquefied petroleum gas (LPG). The performance analysis is conducted here through numerical methods and computational fluid dynamic (CFD) simulations. The focus of the study is on the behavior of the centrifugal-pump as the diffuser-blade angles change. A methodology of dimensional analysis is employed here to combine both, real operating conditions and simulations with a commercialgrade CFD software. The analysis lakes into account the decrease in the density of the transported fluid, along with temperature increases due to the external environment. The monitoring of these two variables is necessary in practice to guarantee a constant flow-rate and it is done analytically since the corresponding experiments are deemed risky and difficult.To evaluate LPG pump-efficiency it is considered here that the range of densities is from 490 to 550 kg/m 3 . The CFD software SolidWorks is used here to conduct the simulations of a centrifugal impeller by varying the fluid density. Operating data from a real-life pump are further used to corroborate the simulations.The vast majority of LPG pumps being installed at industrial parks must hands the fluid as two-phase gas-liquid one. However, most studies elsewhere consider it as a homogeneous flow. In real operating conditions, when dealing with volatile liquids like LPG, pressures lower than the ones of vapor can be produced and this should be avoided to prevent cavitation. Unfortunately, the specialized literature in this topic does not include considerations on the varying physical properties of liquefied gas, such as density. These variations have been at the simulations reported in this paper. It is concluded here that these factors must be taken into account to avoid the poor performance of installed LPG pumps.Analysis of the influence of LPG Density on the Performance of a Centrifugal Pump-Impeller through CFD simulations.

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Flow Analysis in a Pump Diffuser—Part 2: Validation and Limitations of CFD for Diffuser Flows

Cited by 19 publications

References 7 publications

Hub shape effects on the inducers performance under cavitation

Hub shape effects on the inducers performance under cavitation

Numerical Simulation Research on Radial Force of Centrifugal Pump with Guide Vanes

Analysis of the Influence of LPG Density on the Performance of a Centrifugal Pump-Impeller Through CFD Simulations

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