Journal ArticleDOI
Statistical characteristics of suction pressure signals for a centrifugal pump under cavitating conditions
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TLDR
In this article, a closed loop was established to investigate the pump cavitation phenomenon, the statistical parameters for PDF (Probability Density Function), Variance and RMS (Root Mean Square) were used to analyze the relationship between the cavitation performance and the suction pressure signals during the development of cavitation.Abstract:
Centrifugal pumps are often used in operating conditions where they can be susceptible to premature failure. The cavitation phenomenon is a common fault in centrifugal pumps and is associated with undesired effects. Among the numerous cavitation detection methods, the measurement of suction pressure fluctuation is one of the most used methods to detect or diagnose the degree of cavitation in a centrifugal pump. In this paper, a closed loop was established to investigate the pump cavitation phenomenon, the statistical parameters for PDF (Probability Density Function), Variance and RMS (Root Mean Square) were used to analyze the relationship between the cavitation performance and the suction pressure signals during the development of cavitation. It is found that the statistical parameters used in this research are able to capture critical cavitation condition and cavitation breakdown condition, whereas difficult for the detection of incipient cavitation in the pump. At part-load conditions, the pressure fluctuations at the impeller inlet show more complexity than the best efficiency point (BEP). Amplitude of PDF values of suction pressure increased steeply when the flow rate dropped to 40 m3/h (the design flow rate was 60 m3/h). One possible reason is that the flow structure in the impeller channel promotes an increase of the cavitation intensity when the flow rate is reduced to a certain degree. This shows that it is necessary to find the relationship between the cavitation instabilities and flow instabilities when centrifugal pumps operate under part-load flow rates.read more
Citations
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Journal ArticleDOI
Cavitation-Vortex-Pressure Fluctuation Interaction in a Centrifugal Pump Using Bubble Rotation Modified Cavitation Model Under Partial Load
Weihua Sun,Lei Tan +1 more
TL;DR: In this paper, the cavitation-vortex-pressure fluctuation interaction in a centrifugal pump under partial load with experimental validation was investigated, and the authors used the improved unsteady calculation model based on bubble-rotation-based Zwart-Gerber-Belamri (BRZGB) cavitation model.
Journal ArticleDOI
Investigation of the correlation mechanism between cavitation rope behavior and pressure fluctuations in a hydraulic turbine
TL;DR: In this paper, a study of the multiphase flow in a model turbine is presented using the software ANSYS CFX, where the main emphasis is spent on understanding the mechanism of cavitation evolution and underlying its correlation mechanism with flow instabilities.
Journal ArticleDOI
An experimental study on the cavitation vibration characteristics of a centrifugal pump at normal flow rate
TL;DR: An ameliorative algorithm-united algorithm for cavitation vibration analysis is proposed on the basis of short time Fourier transform (STFT) and Wigner-Ville distribution (WVD) as discussed by the authors.
Journal ArticleDOI
Unsteady flow characteristics and cavitation prediction in the double-suction centrifugal pump using a novel approach:
TL;DR: The recent advances in centrifugal pump design do not only require a better suction performance but also there have been attempts to reduce design time at a lower cost as discussed by the authors, and the traditional trial-and-er...
Journal ArticleDOI
Detection of Inception Cavitation in Centrifugal Pump by Fluid-Borne Noise Diagnostic
TL;DR: In this paper, the authors presented an experimental methodology that is capable of sensitively detecting the cavitation inception in a centrifugal pump by measuring the bubble pattern distribution at impeller inlet, and the vibration and noise were synchronously measured at different flow conditions with several cavitation coefficients.
References
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MonographDOI
Hydrodynamics of Pumps
TL;DR: In this article, the authors focus on the design issues associated with the flow of liquid through a rotating machine and the potential for cavitation and the high density of liquids that enhances the possibility of damaging unsteady flows and forces.
Journal ArticleDOI
Numerical simulation of leading edge cavitation within the whole flow passage of a centrifugal pump
TL;DR: In this paper, a simulation of a single-stage centrifugal pump with cavitation was performed using the k-ω SST turbulence model combining with a multiphase approach, based on a homogeneous model assumption.
Journal ArticleDOI
Identification of Critical Net Positive Suction Head From Noise and Vibration in a Radial Flow Pump for Different Leading Edge Profiles of the Vane
S. Christopher,S. Kumaraswamy +1 more
TL;DR: In this paper, experimental investigations concerning cavitation in radial flow pump for three different leading edge profiles of the vane were carried out in an open circuit system and the results revealed that the noise and vibration were better predictors of inception and development of cavitation.
Journal ArticleDOI
Numerical and experimental investigation on the development of cavitation in a centrifugal pump
TL;DR: The research reveals the occurrence and development of cavitation in the centrifugal pump which has been confirmed through experiments and numerical simulation, and the typical frequency of pump inlet pressure pulsation could be regarded as around 30 Hz in the severe cavitation conditions.
Dissertation
The non-intrusive detection of incipient cavitation in centrifugal pumps
TL;DR: In this paper, the authors report the results of experiments to predict the onset of cavitation using a range of statistical parameters derived from: the vibration signal obtained from an accelerometer on the pump casing, the airborne acoustic signal from a microphone close to the outlet of the pump and the waterborne acoustic signals from a hydrophone in the outlet pipe close to a pump.
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