An Experimental Study on the Fluid Forces Induced by Rotor‐Stator Interaction in a Centrifugal Pump

Guo, Shuxiang; Okamoto, Hidenobu

doi:10.1155/s1023621x03000125

Cited by 38 publications

(11 citation statements)

References 10 publications

(16 reference statements)

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“…Rotor-stator interaction [74,75] is the main factor of radial force, but The above analyses illustrate that the influence of tip clearance on pressure fluctuation has various forms in terms of magnitude, frequency, and variation trends for different types of pumps and turbines, and the variation of the impact is due to the complex flow pattern in those divers machineries.…”

Section: Radial Forcementioning

confidence: 99%

A Review of Tip Clearance in Propeller, Pump and Turbine

2018

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Propellers, pumps, and turbines are widely applied in marine equipment, water systems, and hydropower stations. With the increasing demand for energy conservation and environmental protection, the high efficiency and the stable operation of pumps and turbine have been drawing great attention in recent decades. However, the tip clearance between the rotating impeller and the stationary shroud can induce leakage flow and interact with the main stream, introducing complex vortex structures. Consequently, the energy performance and the operation stability of pumps and turbines deteriorate considerably. Constant efforts are exerted to investigate the flow mechanism of tip-clearance flow and its induced influence on performance. However, due to various pump and turbine types and the complexity of tip-clearance flow, previous works are usually focused on a specific issue. Therefore, a systematic review that synthesizes the related research is necessary and meaningful. This review investigates related research in the recent two decades in the perspectives from fundamental physics to engineering applications. Results reveal the vortex types, trajectory, evolution, and cavitation behaviors induced by tip-clearance flow. It is concluded that the influence characteristics of tip clearance on energy performance are closely related to the machinery type. Tip-clearance size and tip shape are found to be crucial parameters for tip-leakage vortex (TLV). The proposed optimization schemes are also demonstrated to provide inspiration for future research. Overall, this review article provides a coherent insight into the characteristics of tip-clearance flow and the associated engineering-design applications. On the basis of these understandings, comments on conducted research and ideas on future research are proposed.

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Section: Radial Forcementioning

confidence: 99%

A Review of Tip Clearance in Propeller, Pump and Turbine

2018

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“…Numerous studies investigated the characteristics of radial force theoretically, experimentally and numerically. Guo and Okamoto [18] simultaneously measured the radial fluid force acting on impellers, pressure fluctuations in volute and vibration of the shaft, and revealed their relationship under the rotor-stator interaction. Rodriguez et al [19] conducted theoretical analysis on frequency and amplitude of non-uniform fluid radial force for centrifugal pumps, and analyzed the relationship between dominant frequency and the number of blades and guide vanes, and the sequence of interaction.…”

Section: Introductionmentioning

confidence: 99%

Energy Performance and Radial Force of a Mixed-Flow Pump with Symmetrical and Unsymmetrical Tip Clearances

et al. 2017

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Abstract:The energy performance and radial force of a mixed flow pump with symmetrical and unsymmetrical tip clearance are investigated in this paper. As the tip clearance increases, the pump head and efficiency both decrease. The center of the radial force on the principal axis is located at the coordinate origin when the tip clearance is symmetrical, and moves to the third quadrant when the tip clearance is unsymmetrical. Analysis results show that the total radial force on the principal axis is closely related to the fluctuation of mass flow rate in each single flow channel. Unsteady simulations show that the dominant frequencies of radial force on the hub and blade correspond to the blade number, vane number, or double blade number because of the rotor stator interaction. The radial force on the blade pressure side decreases with the tip clearance increase because of leakage flow. The unsymmetrical tip clearances in an impeller induce uneven leakage flow rate and then result in unsymmetrical work ability of each blade and flow pattern in each channel. Thus, the energy performance decreases and the total radial force increases for a mixed flow pump with unsymmetrical tip clearance.

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“…The pressure pulsation is known in literature as spreading in a form of waves in the whole hydraulic system [3]. Not only will the pump head, flow rate, and efficiency be influenced, but also potentially hydraulic exciting forces [4] and hydraulic components resonance will be induced [5] or even induce fatigue cracks of the construction [6,7]. Rzentkowski and Zbroja found that the pump acoustic behavior is exclusively governed by the pressure term, and the excitation frequency agrees well with the pressure pulsation frequency [8].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Pressure Pulsation Induced by Rotor-Stator Interaction in Nuclear Reactor Coolant Pump

Zhang

Wang

Ruan

et al. 2017

Shock and Vibration

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The internal flow of reactor coolant pump (RCP) is much more complex than the flow of a general mixed-flow pump due to high temperature, high pressure, and large flow rate. The pressure pulsation that is induced by rotor-stator interaction (RSI) has significant effects on the performance of pump; therefore, it is necessary to figure out the distribution and propagation characteristics of pressure pulsation in the pump. The study uses CFD method to calculate the behavior of the flow. Results show that the amplitudes of pressure pulsation get the maximum between the rotor and stator, and the dissipation rate of pressure pulsation in impellers passage is larger than that in guide vanes passage. The behavior is associated with the frequency of pressure wave in different regions. The flow rate distribution is influenced by the operating conditions. The study finds that, at nominal flow, the flow rate distribution in guide vanes is relatively uniform and the pressure pulsation amplitude is the smallest. Besides, the vortex shedding or backflow from the impeller blade exit has the same frequency as pressure pulsation but there are phase differences, and it has been confirmed that the absolute value of phase differences reflects the vorticity intensity.

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An Experimental Study on the Fluid Forces Induced by Rotor‐Stator Interaction in a Centrifugal Pump

Cited by 38 publications

References 10 publications

A Review of Tip Clearance in Propeller, Pump and Turbine

A Review of Tip Clearance in Propeller, Pump and Turbine

Energy Performance and Radial Force of a Mixed-Flow Pump with Symmetrical and Unsymmetrical Tip Clearances

Analysis of Pressure Pulsation Induced by Rotor-Stator Interaction in Nuclear Reactor Coolant Pump

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