Numerical analysis of the unsteady flow in the near-tongue region in a volute-type centrifugal pump for different operating points

Barrio, Raúl; Parrondo, Jorge; Blanco, Eduardo

doi:10.1016/j.compfluid.2010.01.001

Cited by 158 publications

(78 citation statements)

References 18 publications

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“…Second, constructing and testing physical prototypes are expensive and time-consuming endeavors, which reduce the profit margins of pump manufacturers. Consequently, several studies have been conducted on CFD to serve as guides for pump design and optimization [5][6][7][8][9][10][11][12][13][14]. In terms of pressure pulsation and radial force, Gao et al [15] studied the static performance and pressure fluctuation of a large centrifugal pump and determined the main frequency of mine monitoring points; their findings agreed well with experimental data.…”

Section: Prefacesupporting

confidence: 65%

Effects of Impeller Diameter on High‐Speed Rescue Pump

Bai

Kong

Xia

et al. 2017

Mathematical Problems in Engineering

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Impeller diameter is a crucial design parameter of high-speed rescue pumps because it affects the performance and inner flow characteristics of these pumps. In this study, a pump with an impeller diameter of 248 mm was modeled and its performance was tested. Numerical simulations were conducted under steady and unsteady states, in which the sizes of the impeller diameters were designated as 248 mm (original), 235.6 mm (5% trimmed), 223.2 mm (10% trimmed), and 210.8 mm (15% trimmed). ANSYS software was used to test the shear stress transport (SST -) of the four models, and results agreed well with experimental data. Diameter size affected impeller characteristics in both steady and unsteady states. Subsequently, the differences in performance, hydraulic loss, pressure pulsation, and radial force of the impellers were evaluated. In the performance test, the head and efficiency of the pump decreased as impeller diameter was reduced. The result trends are in accordance with the trim law within the acceptable error range. In terms of hydraulic loss, the impeller and diffuser vane components presented opposite trends with flow rate increase. Finally, in terms of pressure pulsation and radial force, the amplitude diminished while periodicity improved as impeller diameter decreased. PrefaceThe number of mining flooding accidents has increased in China and in other countries, and rescue operation groups have since demanded for lower-volume, higher-powered, and higher-speed pumps compared with conventional types. The current rescue pumps used for mining flooding are the multistage types, which have sufficient power and head to alleviate flooding from the bottom to the ground, but are complex and too large to use in narrow mining wells [1][2][3][4]. Consequently, the research groups at Jiangsu University that are in charge of rescue pump development have designed a series of smallvolume, high-powered, and high-speed rescue pumps that can be easily used during mining flooding incidents.In recent years, computational fluid dynamics (CFD) analysis has been applied to the hydrodynamic design of several pump types due to the following reasons. First, the outcomes of hydraulic design and performance are difficult to predict because of complex geometric parameters. Second, constructing and testing physical prototypes are expensive and time-consuming endeavors, which reduce the profit margins of pump manufacturers. Consequently, several studies have been conducted on CFD to serve as guides for pump design and optimization [5][6][7][8][9][10][11][12][13][14]. In terms of pressure pulsation and radial force, Gao et al. [15] studied the static performance and pressure fluctuation of a large centrifugal pump and determined the main frequency of mine monitoring points; their findings agreed well with experimental data. Zhang et al.[16] investigated a conventional spiral volute pump and demonstrated how slope volute contributes to the significant decline of pressure pulsation. Pei et al. [17][18][19] investigated the flow unsteadiness ...

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Section: Prefacesupporting

confidence: 65%

Effects of Impeller Diameter on High‐Speed Rescue Pump

Bai

Kong

Xia

et al. 2017

Mathematical Problems in Engineering

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“…It is principally a consequence of the interaction of nonuniform outflux from impeller to tongue [3,4]. Barrio et al [5] presented a study on the fluid-dynamic fluctuations in a centrifugal pump with different radial gaps between the impeller and the volute. For a given impeller diameter, the dynamic load increases for offdesign conditions, especially for the low range of flow rates, whereas the progressive reduction of the impeller-tongue gap brings about corresponding increments in dynamic load.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Characteristics of Pressure Fluctuations in an Axial-Flow Water Pump

Shuai

Zhang

et al. 2014

Advances in Mechanical Engineering

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Flow induced vibration due to the dynamics of rotor-stator interaction in an axial-flow pump is one of the most damaging vibration sources to the pump components, attached pipelines, and equipment. Three-dimensional unsteady numerical simulations were conducted on the complex turbulent flow field in an axial-flow water pump, in order to investigate the flow induced vibration problem. The shear stress transport (SST) -model was employed in the numerical simulations. The fast Fourier transform technique was adopted to process the obtained fluctuating pressure signals. The characteristics of pressure fluctuations acting on the impeller were then investigated. The spectra of pressure fluctuations were predicted. The dominant frequencies at the locations of impeller inlet, impeller outlet, and impeller blade surface are all 198 Hz (4 times of the rotation frequency 49.5 Hz), which indicates that the dominant frequency is in good agreement with the blade passing frequency (BPF). The first BPF dominates the frequency spectrum for all monitoring locations inside the pump.

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“…Guleren and Pinarbasi investigated the flow effects due to dynamic interaction between the flow leaving the impeller and the volute tongue within the stalled, and the switching between the reverse and jet flows in the diffuser channel was observed under the rotating stall condition [9]. Barrio et al analyzed the unsteady flow in the near-tongue region in a volutetype centrifugal pump for different operating points [10]. Sheng et al presented a three-dimensional compressible flow model to study the occurrence of weak rotating waves in unparallel wall vaneless diffusers in centrifugal compressors, and the results showed suppression effects on rotating stall of diffusers with contracting walls and the effects increase with the wall contraction [11].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Broadband Noise Sources of an Axial Fan under Rotating Stall Conditions

Zhang

Wang

2014

Advances in Mechanical Engineering

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Study on the influence of rotating stall on the aerodynamic noise of axial fan has important value to warn of the occurrence of stall through monitoring the noise variations. The present work is to analyze the aerodynamic noise before and after the phenomenon of rotating stall by solving Navier-Stokes equations, coupled with the throttle condition and the broadband noise sources model. The impeller exit rotational Mach number and rotational Reynolds number are separately 0.407 and 8.332 × 106 . The results show that the aerodynamic noise source of the fan is mainly the rotation noise under the design condition. The vortex noise accounts for the major part of fan noise after the occurrence of stall, and the maximum acoustic power level of the fan appears in the rotor domains. In the evolution process from the stall inception to the stall cell, the high noise regions of the rotor develop along the radial, circumferential, and axial directions, and the area occupied by high noise regions increases from 33% to 46% impeller channels area. On rotating stall condition, the high noise regions occupying about 46% impeller channels area propagate with the stall cell along the circumferential direction at a half of rotor speed.

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Numerical analysis of the unsteady flow in the near-tongue region in a volute-type centrifugal pump for different operating points

Cited by 158 publications

References 18 publications

Effects of Impeller Diameter on High‐Speed Rescue Pump

Effects of Impeller Diameter on High‐Speed Rescue Pump

Numerical Study on the Characteristics of Pressure Fluctuations in an Axial-Flow Water Pump

Simulation of Broadband Noise Sources of an Axial Fan under Rotating Stall Conditions

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