Prediction of rotating stall within an impeller of a centrifugal pump based on spectral analysis of pressure and velocity data

Ullum, Ulrik; Wright, J E; Dayi, Oguz; Ecder, Ali; Soulaïmani, Azzeddine; Piché, Robert; Kamath, Hemant

doi:10.1088/1742-6596/52/1/004

Cited by 31 publications

(25 citation statements)

References 6 publications

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“…Ulrik et al [2] captured the rotating stall frequency for two different pumps with the help of power spectrum analysis to the experimental data. Krause et al and Manish et al carried out flow measurement to centrifugal pumps using the PIV, and interesting flow structures including the "JetWake" flow pattern were found in the vaned diffuser [3,4].…”

Section: Introductionmentioning

confidence: 99%

Performance prediction and flow analysis in the vaned distributor of a pump turbine under low flow rate in pump mode

Yin

Liu

Wang

et al. 2010

Sci. China Technol. Sci.

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The main goal of this work is to investigate the possible different flow patterns existing in pump turbine under off-design conditions in pump mode. Numerical simulations by solving the Navier-Stokes equation, coupled with the "SST k-ω" turbulence model, were carried out. Flow characteristics were assumed to be stalled in the appropriate region of flow rate levels of Q/Q D =0.15-0.61. The simulation result was compared with experimental data and they showed good agreement. Consequently, velocity fields in three axial locations in stay vanes and guide vanes were analysed in details. It was shown that "jet-wake" flow pattern exists near the band, which changes little in the whole shape with flow rate increasing; to the middle location of vanes, reverse flow begins to appear on the interface between the runner and guide vanes, which will disappear gradually as the flow rate increases; massive reverse flow is captured near the crown, whose intensity will be weakened as the flow rate increases. Ultimately, it was found that the special head-flow profile can be ascribed to the special hydraulic loss characteristics of the stay vanes and guide vanes. pump turbine, flow simulation, stalled flow, guide vane Citation: Yin J L, Liu J T, Wang L Q, et al. Performance prediction and flow analysis in the vaned distributor of a pump turbine under low flow rate in pump mode.

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Section: Introductionmentioning

confidence: 99%

Performance prediction and flow analysis in the vaned distributor of a pump turbine under low flow rate in pump mode

Yin

Liu

Wang

et al. 2010

Sci. China Technol. Sci.

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“…Three different data record lengths, 2 10 , 2 11 , and 2 12 , are examined. For each data record length the spectral resolution is specified as 12.2 Hz, and the optimum order of time series model, p, is determined and found to be 198, 225, and 222, respectively, for the three data record lengths.…”

Section: Resultsmentioning

confidence: 99%

“…Ullum et al [11] reported on the onset and identification of the frequency of rotating stall based on the power spectrum analysis of velocity and pressure data in a centrifugal pump. In a completely different area, Chen Li and 2…”

Section: Introductionmentioning

confidence: 99%

Data Adaptive Spectral Analysis of Unsteady Leakage Flow in an Axial Turbine

Barmpalias

Chokani

Kalfas

et al. 2012

International Journal of Rotating Machinery

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A data adaptive spectral analysis method is applied to characterize the unsteady loss generation in the leakage flow of an axial turbine. Unlike conventional spectral analysis, this method adapts a model dataset to the actual data. The method is illustrated from the analysis of the unsteady wall pressures in the labyrinth seal of an axial turbine. Spectra from the method are shown to be in good agreement with conventional spectral estimates. Furthermore, the spectra using the method are obtained with data records that are 16 times shorter than for conventional spectral analysis, indicating that the unsteady processes in turbomachines can be studied with substantially shorter measurement schedules than is presently the norm.

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“…The stall cell transfers from one blade channel to the adjacent channel at a frequency usually lower than impeller rotating frequency. The frequency of stall is not determined by blade number of model pump [7]. Many researches have been done to illustrate rotating stall characteristics in centrifugal pump with vaned diffuser.…”

Section: Introductionmentioning

confidence: 99%

Unsteady Pressure Pulsation and Rotating Stall Characteristics in a Centrifugal Pump with Slope Volute

Zhang

Yang

Gao

et al. 2014

Advances in Mechanical Engineering

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Unsteady flow structures can lead to severe vibration in centrifugal pump if the eigenfrequency of the rotor is equal to excitation frequency. In order to reduce rotor-stator interaction in centrifugal pump, a special slope volute was proposed. This paper explores the use of numerical simulation method to illustrate unsteady pressure pulsation and rotating stall characteristics under 0.05Φ -1.4Φ working conditions. Spectrums of pressure pulsation signals at different flow rates were analyzed. Relative velocity distributions interior blade channels were also studied to clarify correlation between flow structure and pressure spectrum. At high flow rates, predominant components in pressure spectrums always correspond to blade passing frequency ( BPF ). With decreasing of flow rate, partial flow separates from suction side of blade at 0.6Φ , but the separate structure has little impact on pressure spectrum. From 0.8Φ to 0.6Φ , peak values in pressure spectrums are still located at BPF . At rotating stall working conditions, multiple vortex structures exist in impeller, which develop with rotating impeller showing intensive unsteady properties. And partial blade channels are blocked severely. Due to the unsteady stall cell structure, stall frequencies are generated in pressure spectrum, and the excitation frequencies are different at variable flow rates.

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Prediction of rotating stall within an impeller of a centrifugal pump based on spectral analysis of pressure and velocity data

Cited by 31 publications

References 6 publications

Performance prediction and flow analysis in the vaned distributor of a pump turbine under low flow rate in pump mode

Performance prediction and flow analysis in the vaned distributor of a pump turbine under low flow rate in pump mode

Data Adaptive Spectral Analysis of Unsteady Leakage Flow in an Axial Turbine

Unsteady Pressure Pulsation and Rotating Stall Characteristics in a Centrifugal Pump with Slope Volute

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