Hydraulic Performance of a Mixed-Flow Pump: Unsteady Inviscid Computations and Loss Models

Esch, van Bpm Bart; Kruyt, Nicolaas P.

doi:10.1115/1.1365121

Cited by 28 publications

(13 citation statements)

References 24 publications

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“…By comparing the two sets of data, it is also observed that the total disk loss is proportional to the cube of unit speed n 11 , alike the rotating speed n. This is in accordance with the results obtained in pumps reported by some researchers. 4,5 Table 2 gives the leakage mass flow rate _ m L through the clearance near the runner band. It is found that _ m L varies slightly with operating conditions.…”

Section: Results From Steady Simulationsmentioning

confidence: 99%

Investigation on disk friction loss and leakage effect on performance in a Francis model turbine

Feng

Luo

Zhu

et al. 2017

Advances in Mechanical Engineering

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In this article, computational fluid dynamics technique has been applied to examine the disk friction loss and leakage effect on performance of a Francis model turbine, and a model test for obtaining hydraulic efficiency of the turbine was also conducted. The analysis of the results shows that near the optimal operating point, computational fluid dynamics can predict accurately the turbine hydraulic efficiency compared with experimental value, validating the applied computational fluid dynamics method. The disk friction loss of the runner is observed to increase with the increment of unit speed, and the band surface of the runner produces more disk friction losses than the runner crown surface. Furthermore, the disk friction loss from the inner surfaces of the band and crown is basically equivalent to the one from the outer surfaces. Doubling the clearance size reduces the total friction loss but decreases the turbine efficiency as well. It is also observed that the pressure field on the runner blade suction side is more sensitive to the clearance size than on the pressure side. Moreover, the leakage flow from the clearance near the runner band deteriorates the inflow condition for the downstream draft tube and the flow pattern inside resultantly. It is also observed that the phenomenon of rotor-stator interaction has very limited effects on both the disk friction loss and leakage loss.

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Section: Results From Steady Simulationsmentioning

confidence: 99%

Investigation on disk friction loss and leakage effect on performance in a Francis model turbine

Feng

Luo

Zhu

et al. 2017

Advances in Mechanical Engineering

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“…It should be noted that the calculated flow efficiency and the pressure head are slightly higher than the experimental data. The over-prediction may be attributed to the neglecting of the leakage loss induced by the surface roughness, the clearances in pumps, and the mechanical loss caused by mechanical seals and bearings [19]. As a whole, the numerical method adopted in this work is reasonable for performance prediction of the pump.…”

Section: Pump Performancementioning

confidence: 96%

Effect of space diffuser on flow characteristics of a centrifugal pump by computational fluid dynamic analysis

Liu

Yang

et al. 2020

PLoS ONE

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Achieving an optimal configuration of the diffuser is indispensable for high pump performances. In this work, a numerical study on diffuser configuration is conducted for a high pump performance using a computational fluid dynamics code, and the effects of the wrap angle and the relative position of the diffuser vane to the impeller on pump performances are included. The results indicate that the modified diffuser with a suitable wrap angle may improve the pump hydraulic efficiency and the head by approximately 4% and 8%, respectively, while a suitable position of the diffuser vane can enhance the pump head by more than 4%. Meanwhile, the pressure recovery coefficient and the local Euler head of the diffuser are adopted to evaluate the diffuser performance. For a high pump performance, the local Euler head of the diffuser has a peak value at the leading edge with the change rate of zero along the meridian streamline, meaning that no blade loading at the leading edge of the diffuser guarantees a better match between the impeller and the diffuser.

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“…In previous researches, most simulations were based on incompressible continuity and momentum equations without the consideration of temperature field. 15 In this paper, total energy equation is included to describe the energy dissipation from thermodynamic methods. The performance data are compared to available test results to verify the numerical methods.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis of energy dissipation and unsteady flow characteristic in a centrifugal dredge pump under over-load conditions

Zhao

Wang

Xiao

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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The present paper aims to investigate the energy dissipation related to unsteady flow phenomena inside a three-bladed impeller of a centrifugal dredge pump under over-load operating conditions. Three-dimensional unsteady numerical simulations of the centrifugal pump are performed by adopting the SAS SST-curvature correction turbulence model with the total energy equation. The simulating results are verified by comparing the performance results and pressure fluctuation with available experimental data. The unsteady flow patterns and energy dissipation in the rotating impeller are analysed by entropy distribution and pressure fluctuation spectra. A high-entropy area appears in the impeller flow passage when the discharge increases. It is indicated in the unsteady simulation results that a vortex flow with high entropy generates and detaches periodically, which causes the hydraulic energy loss under over-load operating conditions. In numerical simulations, a frequency as 3.3 times of rotating frequency is found in the pressure spectral analysis at 1.45 Q0 operating condition, which is related to the unsteady flow structure. The secondary flow near the volute tongue is found at 1.45 Q0 operating condition due to the large angle of attack when discharge increases.

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Hydraulic Performance of a Mixed-Flow Pump: Unsteady Inviscid Computations and Loss Models

Cited by 28 publications

References 24 publications

Investigation on disk friction loss and leakage effect on performance in a Francis model turbine

Investigation on disk friction loss and leakage effect on performance in a Francis model turbine

Effect of space diffuser on flow characteristics of a centrifugal pump by computational fluid dynamic analysis

Thermodynamic analysis of energy dissipation and unsteady flow characteristic in a centrifugal dredge pump under over-load conditions

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