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

Guo, Shuxiang; Okamoto, Hidenobu

doi:10.1080/10236210309492

Cited by 14 publications

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“…Further from the nominal operating point, the flow becomes unsuitable, and local stalls may appear which is likely to generate a radial thrust whose amplitude and direction mainly depend on the operating conditions. This static force has been widely studied by a great number of authors [1,2,4,21]. The "radial thrust versus flowrate curve" has a typical "V" form.…”

Section: Radial Thrust and Forces Fluctuations On The Impellermentioning

confidence: 99%

“…For specific states of flow, the unsteady behaviour of the flow due to the rotor/stator interactions formed the subject of many studies. The experimental study of these unsteady phenomena requires complex and/or expensive experimental methods [1][2][3] such as the use of dynamic pressure sensors or strain gauges installed on the pump shaft, and, as a result, the numerical approach becomes a real alternative. As a matter of fact, CFD computations have been commonly used for approximately twenty years to predict the hydraulic performance of rotating machines.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Centrifugal Pumps Working in Direct or Reverse Mode: Focus on the Unsteady Radial Thrust

Couzinet

Gros

Pierrat

2013

International Journal of Rotating Machinery

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Experimental and numerical investigations have been carried out to study the behaviour of a centrifugal pump operating in direct mode or turbine mode. First of all, the complete characteristics (head, power, and efficiency) were measured experimentally using a specific test loop. The numerical data obtained from a CFD study performed with the ANSYS CFX software and based on steady state and unsteady approaches were compared to the experimental results. The representation in the 4 operating quadrants shows the various operating zones where the head is always positive. Then, the unsteady radial forces were analysed from transient computations. The results obtained for the pump operation are consistent with the literature and extended to the nonnormal operating conditions, namely, for very high flowrate values. The evolution of the radial load during turbine operation is presented for various partial flow operating points.

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Section: Radial Thrust and Forces Fluctuations On The Impellermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characteristics of Centrifugal Pumps Working in Direct or Reverse Mode: Focus on the Unsteady Radial Thrust

Couzinet

Gros

Pierrat

2013

International Journal of Rotating Machinery

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“…Gonzáles et al [8] numerically studied the pressure fluctuation characteristics of centrifugal pumps and validated the feasibility of numerical simulation via experiments. Guo and Okamoto [9], Li et al [10], Feng et al [11], Zhou et al [12], Dupont et al [13], and Shi and Tsukamoto [14] studied pressure pulsation and radial force in a centrifugal pump. e results showed that pressure pulsations were caused by rotor-stator interaction.…”

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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“…RSI is generated because pump-turbines consist of a bladed rotor (bladed impellerrunner) and a vaned stator (guide vanes or wicket gates in diffuser-distributor). When the pump-turbine is under operation, there is a fluid-dynamic load every time a blade passes in front of a guide vane, producing a periodic load at blade passing frequency and its harmonics [1][2][3][4][5][6][7]. Forces due to RSI are applied to the impeller-runner which is designed to be as small as possible in order to minimize manufacture and transport expenses leading to a reduced thickness/weight ratio and a high power/weight ratio.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of Rotor-Stator Interaction in Pump-Turbine Using Vibrations Measured with On-Board Sensors Rotating with Shaft

Rodríguez

Mateos-Prieto

Egusquiza

2014

Shock and Vibration

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Current trends in design of pump-turbines have led into higher rotor-stator interaction (RSI) loads over impeller-runner. These dynamic loads are of special interest having produced catastrophic failures in pump-turbines. Determining RSI characteristics facilitates the proposal of actions that will prevent these failures. Pressure measurements all around the perimeter of the impellerrunner are appropriate to monitor and detect RSI characteristics. Unfortunately most installed pump-turbines are not manufactured with in-built pressure sensors in appropriate positions to monitor RSI. For this reason, vibration measurements are the preferred method to monitor RSI in industry. Usually vibrations are measured in two perpendicular radial directions in bearings where valuable information could be lost due to bearing response. In this work, in order to avoid the effect of bearing response on measurement, two vibration sensors are installed rotating with the shaft. The RSI characteristics obtained with pressure measurements were compared to those determined using vibration measurements. The RSI characteristics obtained with pressure measurements were also determined using vibrations measured rotating with shaft. These RSI characteristics were not possible to be determined using the vibrations measured in guide bearing. Finally, it is recommended to measure vibrations rotating with shaft to detect RSI characteristics in installed pump-turbines as a more practical and reliable method to monitor RSI characteristics.

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

Cited by 14 publications

References 0 publications

Characteristics of Centrifugal Pumps Working in Direct or Reverse Mode: Focus on the Unsteady Radial Thrust

Characteristics of Centrifugal Pumps Working in Direct or Reverse Mode: Focus on the Unsteady Radial Thrust

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

Monitoring of Rotor-Stator Interaction in Pump-Turbine Using Vibrations Measured with On-Board Sensors Rotating with Shaft

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