Unsteady Analysis of Impeller-Volute Interaction in Centrifugal Pump

Cheah, Kean Wee; Lee, Thong See; Winoto, S. H.

doi:10.5293/ijfms.2011.4.3.349

Cited by 13 publications

(5 citation statements)

References 38 publications

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“…The numerical predicted efficiency is higher than the experimental one by around 5%, because the mechanical and volumetric losses were not taken into account. Similar results with approximately the same computational mesh quality were presented in reference [10].…”

Section: Fig 10 Inlet Recirculation Vortex At Vertical Cross Sectionsupporting

confidence: 82%

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Numerical Prediction of Inlet Recirculation in Pumps

Lipej¹,

Mitruševski²

2016

International Journal of Fluid Machinery and Systems

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The development of heavy-duty process pumps, usually based on various design criteria, depends on the pump's application. The most important criteria are Q-H, efficiency and NPSH characteristics. Cavitation due to inlet recirculation is not often one of the design criteria, although many problems in pump operation appear because of inlet recirculation, when the operation range is from 0.5-0.8 Q opt .The present paper shows that steady state CFD analysis of inlet recirculation can give quite good results for the design of new hydraulic shapes, which have been developed to expand operating range and to minimize the harmful influence of recirculation at part load. In this paper, the structures of inlet recirculation are presented, as well as detailed shapes of vortices between the blades for various operating regimes, axial velocity distribution at the impeller inlet, the experimental results of NPSH and efficiency characteristics of an existing and newly designed pump.

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Section: Fig 10 Inlet Recirculation Vortex At Vertical Cross Sectionsupporting

confidence: 82%

“…The quality of the computational grid is an important condition for accurate numerical flow analysis results, particularly in the case of dominant decelerating flow in the pump [10,11]. Grid refinement is very important near the impeller walls.…”

Section: Design Of New Geometry Using Cfd Analysismentioning

confidence: 99%

Numerical Prediction of Inlet Recirculation in Pumps

Lipej¹,

Mitruševski²

2016

International Journal of Fluid Machinery and Systems

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“…This special model has proved that it is very helpful for our study because we do not have to use more accurate models that requires higher mesh accuracy such as y+ to be lower than 1. According to [6], they used different kinds of turbulence models and they found that the results did not change greatly. So, we directly used standard k-ε model specially [2] used it and the results were pretty good.…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…The results showed that increasing the gap by this technique reduces the vibrations without affecting the performance badly but it was shown that this method is more effective at flow rates higher than the design flow rate or equal to it. Kean Wee Cheah, Thong See Lee and Sonny H. Winoto [6] carried out unsteady analysis of impeller-volute interaction in centrifugal pump. They used k-e model in FLUENT CFD package.…”

Section: Introductionmentioning

confidence: 99%

A 2d Numerical and Experimental Investigation on the Pressure Fluctuations Inside a Double Volute Centrifugal Pump at Three Different Radial Gaps

Mansour

Abotaleb

2017

Journal of Al-Azhar University Engineering Sector

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Pressure fluctuations in centrifugal pumps are one of the most traumatic issues that exist as a result of the interaction between the rotor "impeller" and stator "volute". The experiments that were carried out on the double volute pump model in Saudi Arabia have proved that the radial gap "clearance" between the impeller and the tongue of the volute plays a major role in increasing and decreasing that vibrations that are generated due to the pressure fluctuations. Unsteady 2D simulations were carried out on the model to study the pressure fluctuations especially at the critical locations such as around the impeller , the cutwater, and the volute tongue. The results show that the sliding mesh technique is a very useful procedure for simulating these kinds of simulations. The results also show that the peak of the pressure fluctuations occurs at the first blade passing frequency for the 3 gaps "2, 3.6, 7"mm. Numerical static pressure was captured accurately for each gap but the amplitude of the pressure fluctuations were overestimated due to the inaccurate nature of the 2D simulations. The highest gap "7 mm" is the best solution for the vibrations and noise reduction due to the decrease in the pressure fluctuations without affecting the performance of the pump greatly. The performance curves are discussed.

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“…The unsteadiness of the pressure field increased as the volume flow was further removed from the best efficiency point. The unsteady velocity field resulting from the strong interactions of impeller/volute in a centrifugal pump was studied numerically by Cheah et al 2 A strong impeller/volute tongue interaction is observed near the volute tongue region based on the periodic fluctuations of pressure at the impeller outlet. These periodic pressure fluctuations at the impeller outlet were attributed to the change in position of the impeller blade relative to the tongue.…”

Section: Introductionmentioning

confidence: 99%

Effect of a volute on the unsteady flow in the vane diffuser of a centrifugal compressor

Zhang

2016

Proceedings of the Institution of Mechanical Engineers, Part A:

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A volute is the only circumferential asymmetric component in a centrifugal compressor, and thus, it should account for the circumferential asymmetry of the flow in a vane diffuser. This study performs a transient numerical analysis to investigate the effect of a volute on the flow in the vane diffuser of a centrifugal compressor under three operating conditions (near-stall, middle, and high mass flow). We compare numerical and experimental performance of the compressor, including polytropic efficiency, total pressure ratio, and unsteady pressure on a diffuser vane. The numerical scheme is proven valid owing to the fact that the numerical and experimental results considerably agree well with each other. Under middle and high mass flow conditions, the time-averaged static pressure recovery and the total pressure loss coefficients for all the diffuser passages indicate that the performance of the passages near and upstream of the volute tongue is affected negatively by the volute, whereas that of the passages downstream of the volute tongue is less affected. Under near-stall condition, the performance of all the passages is disturbed, and the diffuser passage marked as DP 3 demonstrates the worst performance. Investigation on the time-averaged aerodynamic forces, loading, and pressure on the vanes yields results that are consistent with those of the investigation on the performance of the passages. The harmonics with 0.5f b and f b , which are included in the unsteady loading and pressure on the pressure and suction sides of the vanes, are dominant, where f b is the impeller main and splitter blades passing frequency. Their amplitude values increase as mass flow deviates from the middle mass flow condition. Under middle and high mass flow conditions, the harmonic with 0.5f b is affected more negatively because of the larger amplitude on the vanes near and upstream of the volute tongue than those downstream, whereas the harmonic with f b is less affected by the volute. Under the nearstall condition, the transient vorticity fields along with the harmonics of 0.5f b and f b are investigated to evaluate the performance of the diffuser passages. DP 3, which is located at approximately 90 downstream of the volute tongue, suffers the strongest flow deterioration and is inferred to stall first. Further researches for designing more matching diffuser/volute combination will be performed by referring this study.

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Unsteady Analysis of Impeller-Volute Interaction in Centrifugal Pump

Cited by 13 publications

References 38 publications

Numerical Prediction of Inlet Recirculation in Pumps

Numerical Prediction of Inlet Recirculation in Pumps

A 2d Numerical and Experimental Investigation on the Pressure Fluctuations Inside a Double Volute Centrifugal Pump at Three Different Radial Gaps

Effect of a volute on the unsteady flow in the vane diffuser of a centrifugal compressor

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