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

Guo, Shuxiang; Okamoto, Hidenobu; Maruta, Yoshiyuki

doi:10.1299/kikaib.71.1603

Cited by 2 publications

(1 citation statement)

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“…One of the flow phenomena that cause this unsteady hydraulic force is the interaction between a rotating blade and a stator vane [3][4][5][6]. It causes the unsteady hydraulic forces in the blade passing frequency and its higher harmonic frequencies.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics of Cavitating Flow in Mixed Flow Pump with Closed Type Impeller

Kobayashi

Chiba²

2010

International Journal of Fluid Machinery and Systems

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LES(Large Eddy Simulation) with a cavitation model was performed to calculate an unsteady flow for a mixed flow pump with a closed type impeller. First, the comparison between the numerical and experimental results was done to evaluate a computational accuracy. Second, the torque acting on the blade was calculated by simulation to investigate how the cavitation caused the fluctuation of torque. The absolute pressure around the leading edge on the suction side of blade surface had positive impulsive peaks in both the numerical and experimental results. The simulation showed that those peaks were caused by the cavitaion which contracted and vanished around the leading edge. The absolute pressure was predicted by simulation with -10% error. The absolute pressure around the trailing edge on the suction side of blade surface had no impulsive peaks in both the numerical and experimental results, because the absolute pressure was 100 times higher than the saturated vapor pressure. The simulation results showed that the cavitation was generated around the throat, then contracted and finally vanished. The simulated pump had five throats and cavitation behaviors such as contraction and vanishing around five throats were different from each other. For instance, the cavitations around those five throats were not vanished at the same time. When the cavitation was contracted and finally vanished, the absolute pressure on the blade surface was increased. When the cavitation was contracted around the throat located on the pressure side of blade surface, the pressure became high on the pressure side of blade surface. It caused the 1.4 times higher impulsive peak in the torque than the averaged value. On the other hand, when the cavitation was contracted around the throat located on the suction side of blade surface, the pressure became high on the suction side of blade surface. It caused the 0.4 times lower impulsive peak in the torque than the averaged value. The cavitation around the throat caused the large fluctuation in torque acting on the blade.

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Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics of Cavitating Flow in Mixed Flow Pump with Closed Type Impeller

Kobayashi

Chiba²

2010

International Journal of Fluid Machinery and Systems

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

Cited by 2 publications

References 0 publications

Computational Fluid Dynamics of Cavitating Flow in Mixed Flow Pump with Closed Type Impeller

Computational Fluid Dynamics of Cavitating Flow in Mixed Flow Pump with Closed Type Impeller

Control of Pump Performance with Attaching Flaps on Blade Trailing Edges

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