CFD for Centrifugal Pumps: A Review of the State-of-the-Art

Shah, SnehalHimmatlal; Jain, Sanjay V.; Patel, Rajesh N.; Lakhera, Vikas J.

doi:10.1016/j.proeng.2013.01.102

Cited by 108 publications

(59 citation statements)

References 17 publications

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“…Modifications to optimize the performance were proposed to enhance the hydraulic characteristics and consequently increase the efficiency. The modifications that were proposed include trimming the impeller blades, adjusting the blade number, adding splitter blades, installing guide vanes and rounding impeller leading edges [3][4][5][6][7]. Among all the modifications, rounding the impeller leading edges is the simplest method to increase PAT efficiency.…”

Section: Introductionmentioning

confidence: 99%

CFD Modelling of a Pump as Turbine (PAT) with Rounded Leading Edge Impellers for Micro Hydro Systems

2017

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Abstract.A Pump as Turbine (PAT) is one of micro hydro system components that is used to substitute a commercially available turbine due to its wide availability and low acquisition cost. However, PAT have high hydraulic losses due to differences in pumpturbine operation and hydraulic design. The fluid flowing inside the PAT is subjected to hydraulic losses due to the longer flow passage and unmatched fluid flow within the wall boundaries. This paper presents the effect of rounding the impeller leading edges of the pump on turbine performance. A CFD model of a PAT was designed to simulate virtual performance for the analysis. The aim of this study is to observe the internal hydraulic performance resulting from the changes in the performance characteristics. Highest efficiency was recorded at 17.0 l/s, an increase of 0.18%. The simulation results reveal that there is an improvement in hydraulic performance at overflow operation. The velocity vector visualization shows that there is a reduction in wake and consequently less flow separation along impeller flow passages. However, adjusting the sensitive impeller inlet geometry will also alter the velocity inlet vector and consequently change the velocity triangles for the turbo machinery system.

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Section: Introductionmentioning

confidence: 99%

CFD Modelling of a Pump as Turbine (PAT) with Rounded Leading Edge Impellers for Micro Hydro Systems

2017

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“…Profundizar en el conocimiento del flujo de fluidos en base exclusivamente a esta metodología puede resultar costoso e incluso impracticable. Desde la década de los 70, el uso de herramientas computacionales para el desarrollo del análisis del flujo de fluidos y sus fenómenos se ha ido incrementando gracias al mejoramiento de la tecnología computacional y el desarrollo de técnicas numéricas (Shah et al, 2013;Fernández, 2012). La Dinámica de Fluidos Computacional (CFD del inglés Computational Fluid Dynamics) es una herramienta muy útil para analizar en detalle el fenómeno de la turbulencia en tanques agitadores, los cuales son comúnmente usados en procesos industriales (Jaworski y Zakrzewska, 2002;Montante et al, 2001;Gabriele et al, 2009).…”

Section: Introductionunclassified

Estudio del Comportamiento Fluido-Dinámico de un Agitador a Escala Reducida Mediante Simulación Numérica

et al. 2017

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* Autor a quien debe ser dirigida la correspondenciaRecibido Sep. 25, 2016; Aceptado Dic. 9, 2016; Versión final Mar. 10, 2017, Publicado Jun. 2017 Resumen Se presenta el estudio del comportamiento de un agitador con impulsor hidroala (hydrofoil), usado para mezclar agua con partículas polimetálicas en la industria minera, mediante simulación numérica con software de dinámica de fluidos computacional (CFD). La mezcla tiene densidad promedio de 1.623 kg/m 3 , viscosidad aparente de 0.065 kg/m·s y fue modelada como un líquido homogéneo no-newtoniano. En la simulación el problema se resuelve mediante un modelo homogéneo Euler-Euler para flujo bifásico de superficie libre en estado estacionario, utilizando el modelo de turbulencia k-ε. Se obtuvo la curva de potencia, que relaciona el número de potencia (Np) con el número de Reynolds (Re), a partir de la curva de torque del impulsor en función de su velocidad angular entre 200 y 700 rpm. Se encontró que Np converge asintóticamente a 0.32 en régimen turbulento, valor que está en correspondencia con los resultados experimentales obtenidos en el presente estudio y los disponibles en la literatura. Palabras clave: agitador; número de potencia; impulsor hidroala; CFD; mezcladores Study of the Fluid-Dynamic Behavior of a Reduced Scale Stirred Tank through Numerical Simulation AbstractThis paper presents the study of the behavior of a stirred tank with hydrofoil impeller, used to mix water with polymetallic particles in the mining industry, through numerical simulation with CFD software. The mixture has an average density of 1.623 kg / m 3 and an apparent viscosity of 0.065 kg / m-s, and was modeled as a non-newtonian homogeneous liquid. The homogeneous Euler-Euler model for free surface biphasic flow in steady state is solved in the simulation, using the k-ε turbulence model. The power curve, which correlates the power number (Np) with the Reynolds number (Re), was obtained from the torque curve of the impeller versus its angular velocity between 200 and 700 rpm. It was found that Np asymptotically converges to 0.32 in turbulent regime, a value that is in agreement with experimental results obtained in the present study and those available in the literature.

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“…Impeller and diffuser flows have been extensively studied, and volute flow study has appeared as an interesting research. 25 In this article, the dilute solid-liquid two-phase flow in a centrifugal dredge pump is simulated both experimentally and numerically, so that characteristics of flow field and sediment motion in a simplified twodimensional (2D) model are analyzed using numerical simulations and physical tests. Achieving this purpose, methods to calculate the segregation angles of solid particles in the swirling flow and design of dredge pump, and measurements against abrasion are proposed.…”

Section: Introductionmentioning

confidence: 99%

Trajectories of coarse granular sediment particles in a simplified centrifugal dredge pump model

Zhang²,

2016

Advances in Mechanical Engineering

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Due to different inertia, sediment particles stop following the trails of water elements during the flow passage of a centrifugal pump. In a dredge pump, deviation characteristics of sediment particles from surrounding fluid are still not crystal clear. Apparently, the deviation makes sediment particles attacking the inner wall and causes wear and tear. In addition, the deviation would also decrease the pump efficiency. In order to understand the motion of the sediment particles and their deviation characteristics inside a dredge pump, authors built a Lagrangian numerical model based on particle's kinematic balance equations, and then verified it through a rotating platform. The influential factors of the sediment particle motion, such as the rotation speed, as well as the diameter and density of sediment particles, were investigated. Finally, a conclusion is obtained that says if blade profiles are close to the relative trajectory of a particle, this particle will cause minimized wear to the blade wall.

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CFD for Centrifugal Pumps: A Review of the State-of-the-Art

Cited by 108 publications

References 17 publications

CFD Modelling of a Pump as Turbine (PAT) with Rounded Leading Edge Impellers for Micro Hydro Systems

CFD Modelling of a Pump as Turbine (PAT) with Rounded Leading Edge Impellers for Micro Hydro Systems

Estudio del Comportamiento Fluido-Dinámico de un Agitador a Escala Reducida Mediante Simulación Numérica

Trajectories of coarse granular sediment particles in a simplified centrifugal dredge pump model

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