Development of new “multivolute casing” geometries for radial force reduction in centrifugal pumps

Alemi, Hamed; Nourbakhsh, S. Ahmad; Raisee, Mehrdad; Najafi, Atabak

doi:10.1080/19942060.2015.1004787

Cited by 15 publications

(14 citation statements)

References 14 publications

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“…The turbulence model applied was the Shear Stress Transport (SST). This model is very accurate for the numerical investigation of flow within a centrifugal pump (Shojaeerd et al, 2012), also used by other authors, including Akemi et al (2015) and Li et al (2018) The fluid domain is a rotary domain with constant rotational speed of 1500 rpm. Therefore, all boundary rotated with this speed, except the inlet, which was stationary.…”

Section: Methodsmentioning

confidence: 99%

CFD simulation on centrifugal pump impeller with splitter blades

Rosa

Emerick

2020

Rev. bras. eng. agríc. ambient.

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The present paper aims to present the analysis and comparison of results of computational simulations using Computational Fluids Dynamics (CFD) in impellers of centrifugal pump. Three impellers were simulated: 1) original impeller, 2) original impeller with splitter blades at outlet; 3) original impeller with splitter blades at inlet. The splitters occupied 30% of the length of the main blades. They were simulated using the ANSYS-CFX software system in 1500 rpm rotational speed and at different flow rates. The turbulence model assumed was the Shear Stress Transport (SST). The results were used to build impeller blade head curves, besides the presentation of pressure distribution and streamline behaviour inside the impeller. It was verified that the insertion of the splitter blades reduced the impeller blade head, mainly the impeller with outlet splitter, whose reduction was more intense.

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Section: Methodsmentioning

confidence: 99%

CFD simulation on centrifugal pump impeller with splitter blades

Rosa

Emerick

2020

Rev. bras. eng. agríc. ambient.

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“…Numerical flow modeling of pumps addressing problems and working conditions of real hydraulic machinery became an established method of analysis in recent years. [32][33][34][35][36][37] In this study, the calculation domain includes impeller, volute, suction and discharge pipes, front sidewall gap and front wear ring clearance, without balancing holes. A high-quality structured mesh was developed for the geometry consisting of more than 2.5 million nodes (see Figure 2).…”

Section: Numerical Simulationmentioning

confidence: 99%

The effect of wear ring clearance on flow field in the impeller sidewall gap and efficiency of a low specific speed centrifugal pump

Daqiqshirazi

Torabi

Riasi

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, the flow in the impeller sidewall gap of a low specific speed centrifugal pump is analyzed to study the effect of wear ring clearance and the resultant through-flow on flow field in this cavity and investigate the overall efficiency of the pump. Centrifugal pumps are commonly subject to a reduction in the flow rate and volumetric efficiency due to abrasive liquids or working conditions, since the wear rings are progressively worn, the internal leakage flow is increased. In the new operating point, the overall efficiency of the pump cannot be predicted simply by using the pump characteristic curves. The flow field is simulated with the use of computational fluid dynamics and the three-dimensional full Navier–Stokes equations are solved using CFX software. In order to verify the numerical simulations, static pressure field in volute casing and pump performance curves are compared with the experimental measurements. The results show that, for the pump with minimum wear ring clearance, the disk friction efficiency is the strongest factor that impairs the overall efficiency. Therefore, when the ring clearance is enlarged more than three times, although volumetric efficiency decreases effectively but the reduction in overall efficiency is remarkably smaller due to improvement in the disk friction losses.

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“…The results showed that the maximum amplitudes of pressure fluctuations in volute at serious cavitation condition are twice that at noncavitation condition because of the violent disturbances caused by cavitation shedding and explosion. Hamed [5] investigated reducing the radial force, the effects of concentric volute, and multivolute geometry on the head, efficiency, and radial force of a low speed centrifugal pump at off-design conditions. The results showed that the triple-volute is the most appropriate volute geometry at off-design conditions.…”

Section: Introductionmentioning

confidence: 99%

Study on Flow Characteristics in Volute of Centrifugal Pump Based on Dynamic Mode Decomposition

2019

Mathematical Problems in Engineering

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To investigate the unsteady flow characteristics and their influence mechanism in the volute of centrifugal pump, the Reynolds time-averaged N-S equation, RNG k-ε turbulence model, and structured grid technique are used to numerically analyze the transient flow-field characteristics inside the centrifugal pump volute. Based on the quantified parameters of flow field in the volute of centrifugal pump, the velocity mode contours and oscillation characteristics of the mid-span section of the volute of centrifugal pump are obtained by dynamic mode decomposition (DMD) for the nominal and low flow-rate condition. The research shows that the first-order average flow mode extracted by DMD is the dominant flow structure in the flow field of the volute. The second-order and third-order modes are the most important oscillation modes causing unsteady flow in the volute, and the characteristic frequency of the two modes is consistent with the blade passing frequency and the 2x blade passing frequency obtained by the fast Fourier transform (FFT). By reconstructing the internal flow field of the volute with the blade passing frequency for the nominal flow-rate condition, the periodic variation of the unsteady flow structure in the volute under this frequency is visually reproduced, which provides some ideas for the study of the unsteady structure in the internal flow field of centrifugal pumps.

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Development of new “multivolute casing” geometries for radial force reduction in centrifugal pumps

Cited by 15 publications

References 14 publications

CFD simulation on centrifugal pump impeller with splitter blades

CFD simulation on centrifugal pump impeller with splitter blades

The effect of wear ring clearance on flow field in the impeller sidewall gap and efficiency of a low specific speed centrifugal pump

Study on Flow Characteristics in Volute of Centrifugal Pump Based on Dynamic Mode Decomposition

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