Measurement on the Fluid Forces Induced by Rotor-Stator Interaction in a Centrifugal Pump

Guo, Shuxiang; Okamoto, Hidenobu; Maruta, Yoshiyuki

doi:10.1299/jsmeb.49.434

Cited by 9 publications

(7 citation statements)

References 11 publications

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“…When blade trailing edge flap is located in pressure side of impeller as shown in Figures 14 and 15, the pressure fluctuation grows. Because the fluid excitation force depends on pressure fluctuation [12], the shaft vibration increases when the pressure fluctuation enlarges. Therefore, the small pressure fluctuation leads to the shaft vibration decreasing.…”

Section: Influence Of Blade Trailing Edge Flap On Shaft Vibrationmentioning

confidence: 99%

Control of Pump Performance with Attaching Flaps on Blade Trailing Edges

Kanemori¹,

Pan²

2008

International Journal of Fluid Machinery and Systems

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An innovative method of changing a centrifugal low specific speed pump performance and pressure fluctuation by applying outlet flaps to impeller exit has been investigated. The outlet blade edge section corresponds to the trailing edge of wing on the circular-cascade, which dominates the pump performance and pressure fluctuation. Computational fluid dynamics (CFD) analysis of the entire impeller and volute casing and an experimental investigation are conducted. The pressure fluctuation and the vibration of the shaft are measured simultaneously. Kurtosis is applied as a dimensionless parameter with which the unevenness of velocity distribution at impeller outlet is indicated. The influence of the flaps on the pressure fluctuation is explained by the kurtosis. This paper presents a theoretical method of predicting the pump performance related to the attachment of a flap at impeller outlet.

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Section: Influence Of Blade Trailing Edge Flap On Shaft Vibrationmentioning

confidence: 99%

Control of Pump Performance with Attaching Flaps on Blade Trailing Edges

Kanemori¹,

Pan²

2008

International Journal of Fluid Machinery and Systems

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“…Additionally, pressure fluctuations at the blade passing frequency revealed that the blade tongue interacted with the flow at the impeller outlet plane, and the interaction had clear effects, such as increased fluctuation levels under off-design conditions, limited operation ranges, and increased losses. Guo et al [6] measured pressure fluctuations and the radial fluid forces induced by the rotor-stator interaction and investigated their relationship, and they demonstrated that both the blade pressure fluctuations and the volute static pressures were circumferentially nonuniform (not axisymmetric) under off-design operating conditions. Rodriguez et al [7] carried out a theoretical analysis to qualitatively predict and explain the moving blade passing frequency and the relationship between their amplitudes.…”

Section: Introductionmentioning

confidence: 99%

The Action Mechanism of Rotor–Stator Interaction on Hydraulic and Hydroacoustic Characteristics of a Jet Centrifugal Pump Impeller and Performance Improvement

Ren

Zhang

et al. 2020

Water

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The aim of this study was to investigate the action mechanism of the rotor–stator interaction (RSI) on the transient flow field and hydrodynamic noise field inside the impeller of jet centrifugal pumps (JCPs) and optimize effects of the guide vane on the hydraulic and hydroacoustic characteristics of the impeller. The numerical method of CFD (computational fluid dynamics) coupled with CFA (computational fluid acoustics) was used to analyze the correlation between the guide vane and the flow/sound performances of the impeller. The orthogonal test method, with the hydroacoustic performance of the impeller taken as the objective, was used to optimize the structural parameters of the guide vane for the stability of the hydraulic performance of the JCP. The results show that the RSI leads to a significant increase in the hydroacoustic level of the impeller, but it is indispensable for improving the hydraulic performance of the pump. The RSI effect on the fluctuation intensity of the transient flow field inside the impeller is much more sensitive than the time-average, and the fluctuation intensity of the flow field is positively correlated with the vortex intensity inside the impeller. When the impeller geometry is constant, the evolution processes of the flow field inside the impeller are mainly related to the blade number of the guide vane; when the number of guide vanes is given, the RSI effect on the hydroacoustic characteristic of the impeller is characterized by a positive correlation between the total sound pressure level (SPL) and the fluctuation intensity of the flow field. The frequency spectrum characteristics of the hydroacoustic SPL of the impeller are not consistent with the pressure fluctuation characteristics inside the impeller. The pressure fluctuation characteristics are related not only to the blade number and speed of the impeller but also to its wake characteristics determined by the guide vane. The optimization scheme for the stable hydraulic performance of the JCP significantly reduced the total SPL of the impeller compared with the original scheme, which verifies the feasibility of using the weight matrix optimization method to obtain the global optimization scheme.

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“…For the mixed-flow pump, Hao et al [15] studied the effects of tip clearance size and symmetry on the radial fluid force. With respect to the geometry of diffuser, Guo et al [16,17] carried out an experimental study on the pressure pulsation and radial fluid force of a centrifugal pump with a varying number of diffuser vanes. For the mixed-flow RCP mentioned before, Ni et al [18] studied the effect of diffuser vane trailing edge profile on the pressure pulsation.…”

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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Measurement on the Fluid Forces Induced by Rotor-Stator Interaction in a Centrifugal Pump

Cited by 9 publications

References 11 publications

Control of Pump Performance with Attaching Flaps on Blade Trailing Edges

Control of Pump Performance with Attaching Flaps on Blade Trailing Edges

The Action Mechanism of Rotor–Stator Interaction on Hydraulic and Hydroacoustic Characteristics of a Jet Centrifugal Pump Impeller and Performance Improvement

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

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