Influence of peripheral blade angle on performance and stability of axial inducers

Mejri, Imene; Bakir, Farid; Kouidri, S.; Rey, Robert

doi:10.1243/095765005x28580

Cited by 7 publications

(4 citation statements)

References 14 publications

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“…There are also many studies which combine numerical approaches and experimental tests in order to achieve this goal, so it has turned out to be a powerful tool. [6][7][8][9][10] The typical flow structure around an inducer is characterized by a backflow region and vortices. Upstream of the inducer, very complex flow structures are frequently observed.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of cavitating flow through an axial inducer considering tip clearance

Campos–Amezcua

Khelladi

Mazur-Czerwiec

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper presents three-dimensional numerical simulations and experimental investigations of cavitating flow through an axial inducer. Particularly, this work focuses on the influence of radial tip clearance on cavitation behavior. Numerical analysis was carried out on two different configurations: first, the inducer was modeled without taking tip clearance into consideration. Later, the inducer was modeled with nominal tip clearance and some modifications of this. It was found that radial tip clearance has a significant influence on the overall inducer performance in the non-cavitating regime because of the small size of the inducer. Moreover, the effects of radial tip clearance are strong in inducer cavitation behavior. Numerical results and experimental data with nominal tip clearance were compared in cavitating and noncavitating regimes and these were discussed. The cavitation model used for calculation is based on a single-fluid multiphase flow method, assuming thermal equilibrium between phases. It is based on the classical conservation equations of the vapor phase and a mixture phase, with mass transfer due to cavitation appearing as a source and a sink term in the vapor mass fraction equation. Mass transfer rates are derived from the Rayleigh-Plesset model for bubble dynamics.

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Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of cavitating flow through an axial inducer considering tip clearance

Campos–Amezcua

Khelladi

Mazur-Czerwiec

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

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“…The effects are amplified when the flow rate decreases. The intensity of this phenomenon depends on the general blade design [5] and on the upstream environment [8 -29].…”

Section: Overall Performancementioning

confidence: 99%

“…The authors have been involved for several years in the development of design rules for axial inducers at LEMFI-Paris (Laboratoire d'Energétique et de Mécanique de Fluides Interne) [1][2][3][4][5][6][7][8]. But rather than attempting to give a general treatise on inducers, here the focus is on special cavitation problems and design issues associated with the flow of liquid through axial inducers.…”

Section: Introductionmentioning

confidence: 99%

“…When operating close to the design flow rate, the appearance of cavitations (first bubble) is computable under satisfactory conditions [3]. The influence of geometrical parameters [3,4] such as the shape of the blade leading edge and its sharpening [8], in cavitating and non-cavitating regimes already studied experimentally but since a few years, numerical and experimental approaches are combined to achieve this goal [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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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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CFD analysis of two‐phase cavitating flow in a centrifugal pump with an inducer

2020

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One of the most undesirable phenomena encountered in the operation of a centrifugal pump is cavitation. It causes structural damage, vibration, and blockage of mass flow, leading to a drop in performance and life of the pump. This study addresses cavitation modeling of a single‐stage centrifugal pump and aims at minimizing cavitation by introducing an inducer upstream of the impeller. Furthermore, it aims at understanding different multiphase modeling schemes by a computational fluid dynamics software and its variation from single‐phase flows. The results from the numerical model are first validated against standard experimental data to check the credibility of the model. After validation, a single‐phase analysis is performed for a wide range of operating conditions. Subsequently, the Schnerr‐Sauer cavitation model is invoked and a multiphase analysis is carried out for the same. The results obtained shows that the inducer is effective in reducing the amount of cavitation for a substantial number of operating conditions. The effectiveness of the inducer is calculated, and a 96% effectiveness is observed at the best efficiency point. Furthermore, data from single‐phase and multiphase analysis are compared, and a method based on absolute pressure is proposed, which can provide results with significant accuracy without the need for expensive computation. Finally, Zwart‐Gerber‐Belamri model is used for cavitation modeling, and the behavior of the scheme is compared with Schnerr‐Sauer model. The pump parameters are compared, and the obtained results show close similarity between the two models.

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Influence of peripheral blade angle on performance and stability of axial inducers

Cited by 7 publications

References 14 publications

Numerical and experimental study of cavitating flow through an axial inducer considering tip clearance

Numerical and experimental study of cavitating flow through an axial inducer considering tip clearance

Hub shape effects on the inducers performance under cavitation

CFD analysis of two‐phase cavitating flow in a centrifugal pump with an inducer

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