Numerical Investigation of Periodically Unsteady Pressure Field in a High Power Centrifugal Diffuser Pump

Pei, Ji; Wang, Yiyun; Yuan, Shouqi; Mao, Jieyun

doi:10.1155/2014/159380

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…Spence and Amaral-Teixeira(2008) numerically obtained the pressure–time results at five circumferential locations on the back sidewall and found that the blade–tongue interaction could cause sharp pressure loss at some locations in the sidewall gap. Pei et al (2012; 2013; 2014) showed a self-defined non-dimensional pressure coefficient distribution on a section of the sidewall gap and found that obvious pressure fluctuation would occur in the sidewall gap which could not be neglected. Liu et al (2014) calculated the normalized pressure fluctuation inside the front and back sidewall gaps and indicated that the unsteady flow in the front sidewall gap was strongly coupled with the main flow at the impeller outlet.…”

Section: Introductionmentioning

confidence: 99%

Pressure fluctuation characteristics in the sidewall gaps of a centrifugal dredging pump

Cao

Xiao

Wang

et al. 2017

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Purpose The purpose of this paper is to study the pressure fluctuation characteristics in the sidewall gaps of a centrifugal dredging pump in detail and discover the excitation sources. Design/methodology/approach An unsteady numerical simulation with shear–stress transport–scale-adaptive simulation (SAS-SST) model was conducted for a centrifugal pump considering the sidewall gaps. The numerical codes were validated by a model test carried out in China Water Resources Beifang Investigation, Design and Research Co., Ltd. Fast Fourier transform was used to obtain the frequency components of the pressure fluctuation. Findings Pressure fluctuation characteristics inside the pump were analyzed for a condition near the design point. In the sidewall gaps, the circumferential, radial and axial distribution of the pressure fluctuation amplitude follow different laws. The non-axisymmetrical distribution of pressure fluctuation in the sidewall gaps shows that the unsteady flow in the volute casing which has a non-axisymmetrical geometry imposes an evident effect on the flow field in the sidewall gaps and the interaction between the main flow and the clearance flow cannot be neglected. There are several frequency components appearing as the dominant frequencies at different locations in the sidewall gaps, but the relatively stronger pressure fluctuations are all dominated by the rotating frequency. It indicates that the rotating impeller, which originally makes the shrouds rotate, is the primarily excitation source of the pressure fluctuations in the sidewall gaps. Originality/value The pressure fluctuation characteristics in the sidewall gaps of centrifugal pumps were first comprehensively analyzed. Unsteady flows in the sidewall gaps should be considered during the design and operation of centrifugal pumps.

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Section: Introductionmentioning

confidence: 99%

Pressure fluctuation characteristics in the sidewall gaps of a centrifugal dredging pump

Cao

Xiao

Wang

et al. 2017

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Effect of hub inclination angle on internal and external characteristics of centrifugal pump impellers

et al. 2021

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The flow characteristics at a centrifugal pump impeller are significantly affected by the hub inclination angle (HIA). The large eddy simulation turbulence model is employed to simulate the centrifugal pump impeller internal flow at two HIA values under design (1.0 Qd) and off-design (0.55 Qd) conditions. The reliability of the simulation results is verified by comparing the results at a 0° impeller HIA and experimental data. The results show that an increase in HIA has a positive effect on the head of the centrifugal pump impeller, which exhibited a 5% relative deviation between HIA values of 0° and 40°. Under design conditions, there is a good and similar impeller internal flow at the two HIA values. Under off-design conditions, the relative velocity of the 40° impeller HIA channel inlet is 11.7% higher than that of the 0° impeller HIA, which reduces the flow attack angle and effectively suppresses stall. Moreover, for the 0° impeller HIA, fluctuation caused by the stall cells on the blade suction surface is observed, whereas such a phenomenon is not observed for the 40° impeller HIA.

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Numerical Prediction of a Multistage Centrifugal Pump Performance With Stationary and Moving Mesh

Nocente

Arslan

Nielsen

2015

ASME 2015 Power Conference

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The present work reviews a comparison between calculations of a steady and unsteady three dimensional (3D) flow past the diffuser channels of a centrifugal pump. The commercial software ANSYS Fluent has been used. The considered domain is one of the three stages, since each has exactly the same design. In the first part, simulations are carried out at the best efficiency point (BEP) both steady and transient state, single phase flow and four different turbulence models. Results are compared with the performance report from the manufacturer. In the second part, only the realizable k-ε turbulence model has been taken into account. The simulations have been repeated for different mass flows and the results were again compared with the data from the manufacturer. The comparison performed in the first part shows that integral quantities results are not sensibly influenced by the turbulence model. The comparison at different mass flow shows that the steady state simulations demonstrated to be a good approximation of the transient state, always containing the error within an acceptable limit. The minor computational effort needed makes it attractive to be used for further investigations which will involve two-phase flow studies on the same pump.

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Numerical Investigation of Periodically Unsteady Pressure Field in a High Power Centrifugal Diffuser Pump

Cited by 4 publications

References 17 publications

Pressure fluctuation characteristics in the sidewall gaps of a centrifugal dredging pump

Pressure fluctuation characteristics in the sidewall gaps of a centrifugal dredging pump

Effect of hub inclination angle on internal and external characteristics of centrifugal pump impellers

Numerical Prediction of a Multistage Centrifugal Pump Performance With Stationary and Moving Mesh

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