Unsteady flow structure and its evolution in a low specific speed centrifugal pump measured by PIV

Zhang, Ning; Gao, Bo; Zhong, Li; Ni, Dan; Jiang, Qifeng

doi:10.1016/j.expthermflusci.2018.04.013

Cited by 80 publications

(25 citation statements)

References 20 publications

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“…The indirect measurement method is to measure and analyze the parameters that are related to flow-induced noise such as pressure [73][74][75], velocity [12,[76][77][78] and vibration signal [79][80][81][82][83], then establish the relationship between these parameters and flow-induced noise. Different from the indirect measurement, the direct measurement is more convenient and it is realized by measuring the flow-induced noise directly.…”

Section: Experimental Measurement Studymentioning

confidence: 99%

A Review of the Flow-Induced Noise Study for Centrifugal Pumps

Guo

Gao

2020

Applied Sciences

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Flow-induced noise is a significant concern for the design and operation of centrifugal pumps. The negative impacts of flow-induced noise on operating stability, human health and the environment have been shown in many cases. This paper presents a comprehensive review of the flow-induced noise study for centrifugal pumps to synthesize the current study status. First, the generation mechanism and propagation route of flow-induced noise are discussed. Then, three kinds of study methodologies, including the theoretical study of hydrodynamic noise, numerical simulation and experimental measurement study, are summarized. Subsequently, the application of the three study methodologies to the analysis of the distribution characteristics of flow-induced noise is analyzed from aspects of the noise source identification and comparison, the frequency response analysis, the directivity characteristics of sound field and the noise changing characteristics under various operating conditions. After that, the analysis of the noise optimization design of centrifugal pumps is summarized. Finally, based on previous study results, this paper puts forward the unsolved problems and implications for future study. In conclusion, the information collected in this review paper could guide further study of the flow-induced noise of centrifugal pumps.

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Section: Experimental Measurement Studymentioning

confidence: 99%

A Review of the Flow-Induced Noise Study for Centrifugal Pumps

Guo

Gao

2020

Applied Sciences

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“…The results showed that the internal flow was affected by the RSI at 0.2 times of design flow rate, and as a result, the internal flow is disordered; conspicuous backflow and vortex flow occurred at different phases. The PIV measuring technique was adopted by Zhang et al [13], and they studied the intense RSI region of flow channel. They found the inflection point of the jet-wake region at the center of blade channel.…”

Section: Literature Reviewmentioning

confidence: 99%

Research of transient rotor–stator interaction effect in a mixed-flow pump under part-load conditions

Cao

Wei

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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In order to analyze the unsteady flow characteristic and the pressure fluctuation features of mixed-flow pump caused by the interaction between the impeller and guide vanes under part-load conditions, the unsteady flow field in the mixed-flow pump was numerically simulated based on the standard k-ε turbulence model. The pressure distribution and the velocity distribution in the rotor-stator interaction (RSI) zones were acquired, and the time domain and frequency domain of the pressure fluctuation were emphatically analyzed. The results showed that the velocity within the rotor-stator interaction zones is mainly affected by the relative position of impeller and guide vane. With the decrease in flow rate condition, the flow fields become more violent and more vortexes generate in the RSI zone, which causes much energy losses. With the rotation of impeller, the vortexes generating from RSI zones move into the guide vane and dissipate in the guide vane passage in the end. The pressure pulsations at various monitoring points fluctuate periodically, and there appear four peak and four trough values with the same number of leaves. The dominant frequency of pressure pulsation was approximate to the impeller blade passing frequency (BPF). Within the rotor-stator interaction zones, the pressure pulsation coefficient in the rotor-stator interaction zone of the mixed-flow pump changes most obviously. The BPF and double and triple frequency of the pressure pulsation are dominant frequencies, and the frequency distribution range is relatively concentrated.

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“…The P À1 is the inverse covariance matrix of the whole database X of 25 rows by 400 columns, see matrix in equation 5, where each row is an observation, and each column a variable. The P covariance matrix of X for which the input is ði; jÞ is the covariance calculated using equations (6) and 7, while the inverse covariance P À1 of matrix X is calculated by processing the covariance matrix P using equation (8). Finally, the D M matrix diagonal values from the 25 rows are compared with a threshold to determine if the profile is an outlier or not…”

Section: Technique For 2-d Velocity Profile Enhancementmentioning

confidence: 99%

Magnetohydrodynamic velocity profile measurement for microelectromechanical systems micro-robot design

Flores-Fuentes

Valenzuela-Delgado

Caceres-Hernandez

et al. 2019

International Journal of Advanced Robotic Systems

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The development of microelectromechanical systems based on magnetohydrodynamic for micro-robot applications requires precise control of the micro-flow behavior. The micro-flow channel design and its performance under the influence of the Lorentz force is a critical challenge, the mathematical model of each magnetohydrodynamic device design must be experimentally validated before to be employed in the fabrication of microelectromechanical systems. For this purpose, the present article proposes the enhancement of a particle image velocimetry measurement process in a customized machine vision system. The particle image velocimetry measurements are performed for the micro-flow velocity profile mathematical model validation of a magnetohydrodynamic stirrer prototype. Data mining and filtering have been applied to a raw measurement database from the customized machine vision system designed to evaluate the magnetohydrodynamic stirrer prototype. Outlier’s elimination and smoothing have been applied to raw data to approximate the particle image velocimetry measurements output to the velocity profile mathematical model to increase the accuracy of a customized machine vision system for two-dimensional velocity profile measurements. The accurate measurement of the two-dimensional velocity profile is fundamental owing to the requirement of future enhancement of the customized machine vision system to construct the three-dimensional velocity profile of the magnetohydrodynamic stirrer prototype. The presented methodology can be used for measurement and validation in the design of microelectromechanical systems micro-robot design and any other devices that require micro-flow manipulation for tasks such as stirring, pumping, mixing, networking, propelling, and even cooling.

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Unsteady flow structure and its evolution in a low specific speed centrifugal pump measured by PIV

Cited by 80 publications

References 20 publications

A Review of the Flow-Induced Noise Study for Centrifugal Pumps

A Review of the Flow-Induced Noise Study for Centrifugal Pumps

Research of transient rotor–stator interaction effect in a mixed-flow pump under part-load conditions

Magnetohydrodynamic velocity profile measurement for microelectromechanical systems micro-robot design

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