Estimating uncertainty of measurements for cavitation detection in a centrifugal pump

Černetič, Jan; Čudina, Mirko

doi:10.1016/j.measurement.2011.03.023

Cited by 38 publications

(13 citation statements)

References 10 publications

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“…It is impossible to determine all types of error and how each error can individually impact the overall uncertainty. However, the following equation can be used to determine the overall symmetric uncertainty limits in the case of the pump experiments [18]:…”

Section: Uncertainty Estimation Modelmentioning

confidence: 99%

Performance Analysis of a Microbubble Pump with Novel ‘S-Shape’ Impeller by Experimental and Numerical Analysis at Design and Off-Design Operating Conditions

Ali

Jang

2021

Applied Sciences

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A microbubble pump with a novel ‘S-shape’ impeller is introduced to evaluate pump performance under design and off-design conditions. The robustly designed ‘S-shape’ impeller has a continuously connected impeller blade, which improves the structural strength of the impeller blades as well as pump performance. Pump performance is evaluated by experimental measurements and numerical simulations at three different flow conditions. An experimental apparatus for measuring pump performance is fabricated, and pressure, flowrate, and pump torque are measured in real-time at each flow condition, and the measured data are saved using a data logging system. In order to analyze the reliability of the measured data, evaluations of uncertainty and errors are performed for each of the flow conditions. A commercial code, ANSYS CFX, is introduced to analyze the flow field inside the pump impeller and the pump performance. Throughout the microbubble pump’s performance analysis under design and off-design conditions, turbulent kinetic energy has a higher value as the flowrate is relatively small compared to the design flow condition. It is noted that violent mixing between the internal flow inside the impeller and the channel flow increases turbulent kinetic energy. The higher turbulent kinetic energy observed in the lower-flow condition corresponds to the higher relative uncertainty. In the design flow condition, the highest magnitudes of the recirculating flow are observed as compared to the other two flow conditions. The highest recirculating flow observed at the design flow condition helps to achieve a better momentum exchange, thus increasing the overall efficiency of pump.

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Section: Uncertainty Estimation Modelmentioning

confidence: 99%

Performance Analysis of a Microbubble Pump with Novel ‘S-Shape’ Impeller by Experimental and Numerical Analysis at Design and Off-Design Operating Conditions

Ali

Jang

2021

Applied Sciences

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“…In this case, the calculation of the average time of failure (MTTF) is given by: (13) By integration, we obtain the expression:…”

Section: Reliability In Industrial Systemsmentioning

confidence: 99%

Reliability Evaluation Based on a Fuzzy Expert System: Centrifugal Pump Application

Rachid¹,

Hafaifa²,

Hadroug³

et al. 2016

SIC

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In the development process of modern industrial systems, predictive reliability becomes very important in the design and exploitation of industrial facilities. This paper proposes the development of a new approach to the assessment of predictive reliability, applied to a centrifugal pump based on a fuzzy expert system to improve its performance under actual operating conditions. The obtained results clearly demonstrate how the reproduction of the main dynamic characteristics of the examined pump, using the proposed fuzzy model enables better performance regarding reliability.

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“…Placing the microphones near the centrifugal pump, it was determined that a discrete frequency tone of half the blade pass frequency was distinct from the noise associated with the pump and thus was a clear indication of the onset of cavitation and its development. In later studies, Cudina et al determined that this distinct frequency was a function of the pump's design, such as the pump's geometry and material used, (Černetič & Čudina, 2011;Cudina, 2003;Čudina & Prezelj, 2009). The problems with this analysis are (1) it would be difficult for a technician to implement the detection method without knowing intricate information about the pump, and (2) surrounding noise from the environment could cause background noise interference in the signal, thus resulting in difficulty and possible inability of finding the distinct frequency stated by Cudina.…”

Section: State Of the Art In Cavitation Detectionmentioning

confidence: 99%

A vibration cavitation sensitivity parameter based on spectral and statistical methods

McKee

Forbes

Mazhar

et al. 2015

Expert Systems with Applications

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Cavitation is one of the main problems reducing the longevity of centrifugal pumps in industry today. If the pump operation is unable to maintain operating conditions around the best efficiency point, it can be subject to conditions that may lead to vaporisation or flashing in the pipes upstream of the pump. The implosion of these vapour bubbles in the impeller or volute causes damaging effects to the pump. A new method of vibration cavitation detection is proposed in this paper, based on adaptive octave band analysis, principal component analysis and statistical metrics. Full scale industrial pump efficiency testing data was used to determine the initial cavitation parameters for the analysis. The method was then tested using vibration measured from a number of industry pumps used in the water industry. Results were compared to knowledge known about the state of the pump, and the classification of the pump according to ISO 10816.

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Estimating uncertainty of measurements for cavitation detection in a centrifugal pump

Cited by 38 publications

References 10 publications

Performance Analysis of a Microbubble Pump with Novel ‘S-Shape’ Impeller by Experimental and Numerical Analysis at Design and Off-Design Operating Conditions

Performance Analysis of a Microbubble Pump with Novel ‘S-Shape’ Impeller by Experimental and Numerical Analysis at Design and Off-Design Operating Conditions

Reliability Evaluation Based on a Fuzzy Expert System: Centrifugal Pump Application

A vibration cavitation sensitivity parameter based on spectral and statistical methods

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