Numerical investigation of influence of the clocking effect on the unsteady pressure fluctuations and radial forces in the centrifugal pump with vaned diffuser

Jiang, Wei; Li, Guojun; Liu, Pengfei; Fu, Lei

doi:10.1016/j.icheatmasstransfer.2015.12.025

Cited by 57 publications

(30 citation statements)

References 24 publications

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“…And this is that the inner flow field in the diffuser is affected by both the upstream and the downstream region, but the upstream region is the major factor for affecting that in the volute. The clocking positions have little influence on the total pressure loss of diffuser, while it has a significant effect on that for volute [17]. The differences of the loss for diffuser under different clocking positions cannot exceed 0.2 m (as shown in Fig.…”

Section: Numerical Resultsmentioning

confidence: 90%

“…Although a large amount of research on the clocking effect has been done in aerodynamic turbo machines, little attention has been devoted to the clocking effect in the centrifugal pump and is mainly focused on the pressure pulsation and the transient radial force [17][18][19]. Therefore, more research must be done on centrifugal pumps with guide vane.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical investigation on the influence of the clocking position on hydraulic performance of a centrifugal pump with guide vane

Jiang¹,

Chen²,

Wang³

et al. 2018

J. vibroeng.

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The investigation of the clocking effect mainly concentrates on turbines and compressors, but seldom in centrifugal pumps. In this paper, using numerical simulation and experiment, the influence of the clocking effect on the hydraulic performance of centrifugal pump with guide vane is studied. Numerical simulations with SST-turbulence model were applied to obtain the inner flow field of the test pump. The numerical simulations coincide with the test result, which indicates the accurate of the utilized numerical approach. The results show the clocking positions have an important effect on hydraulic performance of the centrifugal pump with guide vane. The pump demonstrates the higher efficiency and head as the tongue locate between two guide vanes. The hydraulic performance of the volute is a major factor impacting the performance of the centrifugal pump with different clocking positions. However, the clocking position has almost no effect on the performances of the impeller and diffuser. When the guide vane is close to the volute tongue, flow field of volute is more non-uniform, and the energy loss in volute appears to be larger. The results and the method of this paper can provide theoretical reference for the design and installation of guide vane in centrifugal pump.

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Section: Numerical Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation on the influence of the clocking position on hydraulic performance of a centrifugal pump with guide vane

Jiang¹,

Chen²,

Wang³

et al. 2018

J. vibroeng.

View full text Add to dashboard Cite

show abstract

“…Five profiles of the diffuser vane trailing edge were designed and the unsteady vorticity distribution was analyzed to reveal the mechanism. Jiang et al [19] and Wang et al [20] investigated the effect of the circumferential relative position (clocking position) between the diffuser and volute on centrifugal pumps, by the numerical and experimental methods, respectively. Moreover, Zhang et al [21,22] proposed a slope volute for the centrifugal pump in their studies and the effects of the volute modification on the flow structure and pressure pulsation were discussed.…”

Section: Introductionmentioning

confidence: 99%

Effect of Suction and Discharge Conditions on the Unsteady Flow Phenomena of Axial-Flow Reactor Coolant Pump

Chen

et al. 2020

Energies

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In order to study the effects of the suction and discharge conditions on the hydraulic performance and unsteady flow phenomena of an axial-flow reactor coolant pump (RCP), three RCP models with different suction and discharge configurations are analyzed by computational fluid dynamics (CFD) method. The CFD results are validated by experimental data. The hydraulic performance of the three RCP models shows little difference. However, the unsteady flow phenomena of RCP are significantly affected by the variation of suction and discharge conditions. Compared with that of Model E-S (baseline, elbow-single nozzle), the pressure pulsation in rotating frame of Model S-S (straight pipe-single nozzle) and Model E-D (elbow-double nozzles) is weakened in different degrees and forms, due to the more uniform flow fields upstream and downstream of the impeller, respectively. It indicates that the generalized rotor-stator interaction (RSI) actually exists between the rotating impeller and all stationary components causing the circumferentially non-uniform flow. Furthermore, improving the circumferential uniformity of the flow upstream and downstream of impeller (suction and discharge flow) also contributes to reducing the radial dynamic fluid force acting on the impeller. Compared with those of Model E-S, the dynamic FX and FY of Model S-S are severely weakened, and those of Model E-D also gain a minor amplitude decrease at fBPF. In contrast, the general pressure pulsation in fixed frame is mainly related to the rotating impeller and barely affected by the suction and discharge conditions.

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“…In addition, the relative movement between the rotating impeller and stationary diffuser, and the circular motion of the medium flow in the diffuser, during off-design conditions may cause the pressure to rapidly fluctuate with time, resulting in pressure pulsation [6]. Pressure pulsation may cause radial force fluctuation, which will induce vibration and lead to bearing and seal fatigue [7]. e pump outlet pressure pulsation may also cause lifting pipeline resonance, thus seriously affecting the deep-sea mining safety.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Pressure Pulsation Characteristics and Radial Force of a Deep‐Sea Electric Lifting Pump at Off‐Design Conditions

Kang

Liu

Zou

et al. 2019

Shock and Vibration

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To predict the vibrational conditions, the generation mechanism, and action law of pressure pulsation and radial force, a computational fluid dynamics (CFD) study of a deep-sea electric lifting pump operating under different off-design conditions was performed. The time-domain and frequency-domain response of the pressure pulsation at different monitoring points and the radial force of impeller distribution were obtained. Differences in pressure pulsation characteristics between the first stage and second stage were observed. The variation law and influential factors of the radial force under different flow rates were discussed. The present investigation shows that the flow field caused by rotor-stator interaction is not uniform, resulting in uneven pressure distribution and pressure pulsation, the combined effects of which produce fluctuating radial forces. Parameters obtained via simulations including head, efficiency, and power, which can reflect the hydraulic performance of the pump, agree well with experimental results; thus, the accuracy of the simulation model and the calculation method was verified. This study provides a basis for improving the structure and reliability of an electric lifting pump.

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Numerical investigation of influence of the clocking effect on the unsteady pressure fluctuations and radial forces in the centrifugal pump with vaned diffuser

Cited by 57 publications

References 24 publications

Experimental and numerical investigation on the influence of the clocking position on hydraulic performance of a centrifugal pump with guide vane

Experimental and numerical investigation on the influence of the clocking position on hydraulic performance of a centrifugal pump with guide vane

Effect of Suction and Discharge Conditions on the Unsteady Flow Phenomena of Axial-Flow Reactor Coolant Pump

Numerical Investigation on Pressure Pulsation Characteristics and Radial Force of a Deep‐Sea Electric Lifting Pump at Off‐Design Conditions

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