Tip clearance effects on loads and performances of semi-open impeller centrifugal pumps at different specific speeds

Boitel, Guillaume; Fedala, Djaafer; Myon, N

doi:10.1088/1755-1315/49/3/032013

Cited by 12 publications

(7 citation statements)

References 3 publications

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“…As a result, the performance of centrifugal pumps declines, and the vibration and noise increase. This phenomenon is evident in medium and low specific-speed centrifugal pumps [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Tip Leakage Vortex Characteristics in a Semi-Open Centrifugal Pump

et al. 2019

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Tip leakage vortex has an important influence on the performance of semi-open centrifugal pumps. Simulations based on the three-dimensional Reynolds-Averaged Navier–Stokes were conducted to study the structural characteristics of tip leakage vortex and its effects on the internal flow field, and the Shear Stress Transport k-ω turbulence model was used to simulate the whole flow passage of centrifugal pumps with tip clearances of 0 mm and 1 mm. Then, the tip leakage vortex was analyzed using the relative vorticity transport equation. The numerical data and experimental results agreed well. The leakage vortex formed in the tip clearance led to 18.7% and 14.4% decrease in head and efficiency under design condition, respectively, and the bigger the flow rate, the fast the performance decreased. Tip leakage vortex formed at the leading edge of the blade moved along the suction surface. Whereas the tip leakage vortex formed near the middle of the blade extended to the pressure surface of the adjacent blade. This phenomenon deteriorated the flow field and induced passage vortex, thereby reducing the static pressure and blade load and changing the static pressure distribution law. The formation and development of leakage vortex could be attributed to the relative vortex stretching the term. The Coriolis force term could reflect the change of vorticity caused by leakage flow, and the viscous diffusion term served as the vorticity source.

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“…As a result, the performance of centrifugal pumps declines, and the vibration and noise increase. This phenomenon is evident in medium and low specific-speed centrifugal pumps [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Tip Leakage Vortex Characteristics in a Semi-Open Centrifugal Pump

et al. 2019

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“…11 and 12. Here, Ψ value increased with the decrease of tip clearance thickness and was maximized at the case with the minimum tip clearance, due to the minimization of leakage flow passage along with the tip losses and vortex recirculation similarly to [64,[75][76][77]. Similar behavior follows the efficiency of the pump due to the increase of the tip clearance losses.…”

Section: Performance Under Non-cavitating Conditionsmentioning

confidence: 65%

Numerical simulation of the performance of a centrifugal pump with a semi-open impeller under normal and cavitating conditions

Mousmoulis

Aggidis

Anagnostopoulos

2021

Applied Mathematical Modelling

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An important flow mechanism that can affect the performance and efficiency, as also the maintenance cost of centrifugal pumps is cavitation. Scientific research has been focusing on the mechanisms that govern cavitation in order to develop experimental and numerical tools that are able either to detect the phenomenon or to anticipate its appearance. In this study, a computational model is used in order to study the cavitation performance of a radial flow centrifugal pump with a semi open impeller. The numerical model includes and studies the effects of the blade tip clearance and its thickness, and it is validated against corresponding laboratory measurements and visualization data obtained for this pump under normal and cavitating flow conditions. The total head drop variation curves versus cavitation parameter are extracted both numerically and experimentally, and compared for various pump loading conditions with satisfactory agreement. A non-periodic pattern of flow and cavitation bubbles between the impeller blades, which is caused by the inlet pipe bending, is also well reproduced by the model. The numerical results display in detail the complex flow field and the secondary flows developed in the tip clearance area, close to the blades leading edge. The effects of the latter on the onset and development of cavitation at the suction side of the impeller, as well as on the backflow cavitation phenomenon are presented and analyzed. Backflow cavitation is found to affect the suction ability of the pump, especially for moderate cavitation conditions, as far as the pressure differences between the two blade sides remain significant.

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“…Çalışmalarında ön tip açıklığı azaldıkça pompanın basma yüksekliği ve pompa veriminin arttığını ve bu durumun düşük özgül hızlarda daha etkili olduğunu ifade etmişlerdir. Bununla birlikte bütün özgül hızlardaki pompalarda ön tip açıklığının en az, arka tip açıklığının en fazla olduğu durumda eksenel yükün en yüksek değere ulaştığını tespit etmişlerdir [17].…”

Section: Introductionunclassified

Deneysel Tasarım Yöntemleri İle Bir Santrifüj Pompa Çarkında Dengeleme Deliği Tasarım Optimizasyonu

SEFACI¹,

Babayigit

KOÇAK

2022

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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The aim of this study is to determine the optimal balancing hole to be drilled into the pump impeller in order to extend the bearing life by reducing the axial forces exposed on the bearings. In this study, as well as reduction of the axial forces, the changes in the pump efficiency are also considered. For this study, a single-stage centrifugal pump having a 1450 rpm speed, 350 m³/h flow rate and 51 m head is chosen. It is foreseen to optimize the design optimization of the balancing holes on the selected pump impeller is implemented by using the method of experimental design and Computational Fluid Dynamics (CFD). Ansys Fluent software is used for CFD analysis. In order to reach the optimum results, four parameters including the hole center angle, hole diameter, hole center diameter and number of balancing holes in the impeller are selected, and the optimization study is carried out by using Multi-Objective Taguchi Method. Low axial force and high pump efficiency are accepted as objectives. CFD results are evaluated according to the analysis of variance (ANOVA) and signal/noise (S/N) ratio. As a result, it is determined that the hole diameter is the most effective parameter on these objectives. The optimum design parameters are found to be 0°, 12 mm, 100 mm and 6 for the parameters given above, respectively.

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Tip clearance effects on loads and performances of semi-open impeller centrifugal pumps at different specific speeds

Cited by 12 publications

References 3 publications

Numerical Simulation of the Tip Leakage Vortex Characteristics in a Semi-Open Centrifugal Pump

Numerical Simulation of the Tip Leakage Vortex Characteristics in a Semi-Open Centrifugal Pump

Numerical simulation of the performance of a centrifugal pump with a semi-open impeller under normal and cavitating conditions

Deneysel Tasarım Yöntemleri İle Bir Santrifüj Pompa Çarkında Dengeleme Deliği Tasarım Optimizasyonu

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