Effects of impeller trim on performance of two-stage self-priming centrifugal pump

Wang, Kai; Zhang, Zixu; Jiang, Linglin; Liu, Houlin; Yu, Li

doi:10.1177/1687814017692493

Cited by 12 publications

(8 citation statements)

References 10 publications

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“…where ε is the dissipation rate of turbulent kinetic energy, which is already available in the turbulence model. To quantify the influence of entropy production, the power lost by entropy production in a certain domain can be estimated by integrating the dissipation rate in the whole domain, as illustrated by Equation (6).…”

Section: Hydraulic Loss Estimation Methodsmentioning

confidence: 99%

“…Existing research indicates that the gap between the impeller and the volute tongue has a significant impact on the efficiency and radial force of centrifugal pumps [ 4 , 5 ]. Wang et al [ 6 ] reported that trimming impellers in a two-stage self-priming centrifugal pump decreased the radial force on the radial guide vanes and volute; however, the self-priming time increased. Both Yang [ 7 ] and Sanjay [ 8 ] experimentally investigated centrifugal pumps running in turbine mode and determined that impeller trimming could effectively influence efficiency, but the results varied.…”

Section: Introductionmentioning

confidence: 99%

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Energy Loss and Radial Force Variation Caused by Impeller Trimming in a Double-Suction Centrifugal Pump

Deng

Pei

Wang

et al. 2021

Entropy

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Impeller trimming is an economical method for broadening the range of application of a given pump, but it can destroy operational stability and efficiency. In this study, entropy production theory was utilized to analyze the variation of energy loss caused by impeller trimming based on computational fluid dynamics. Experiments and numerical simulations were conducted to investigate the energy loss and fluid-induced radial forces. The pump’s performance seriously deteriorated after impeller trimming, especially under overload conditions. Energy loss in the volute decreased after trimming under part-load conditions but increased under overload conditions, and this phenomenon made the pump head unable to be accurately predicted by empirical equations. With the help of entropy production theory, high-energy dissipation regions were mainly located in the volute discharge diffuser under overload conditions because of the flow separation and the mixing of the main flow and the stalled fluid. The increased incidence angle at the volute’s tongue after impeller trimming resulted in more serious flow separation and higher energy loss. Furthermore, the radial forces and their fluctuation amplitudes decreased under all the investigated conditions. The horizontal components of the radial forces in all cases were much higher than the vertical components.

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Section: Hydraulic Loss Estimation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy Loss and Radial Force Variation Caused by Impeller Trimming in a Double-Suction Centrifugal Pump

Deng

Pei

Wang

et al. 2021

Entropy

View full text Add to dashboard Cite

show abstract

“…Yi (1991) and Chen (1998;1990) undertook many experimental studies on the self-priming centrifugal pump, including on the design method, factors influencing the selfpriming performance, the effect of the reflux hole on self-priming performance curves, the correlations among reflux hole area, self-priming time and suction lift and the empirical equation for the reflux hole critical area. Wang (2017) studied the effects of impeller trim on performance of two-stage selfpriming centrifugal pump.…”

Section: Introductionmentioning

confidence: 99%

Effect of Reflux Hole on the Transient Flow Characteristics of the Self-Priming Sewage Centrifugal Pump

Zhou

Mou

et al. 2019

JAFM

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The reflux hole has a large effect on the performance of self-priming centrifugal pumps. In order to study the effects of the reflux hole on the performance and transient flow characteristics of the self-priming centrifugal pump, four different areas of the reflux hole inside an external mixed self-priming pump were proposed. The 3D transient flow was numerically simulated under different operating conditions for the investigated pump. The differential pressure, reflux quantity and transient flow characteristics near the reflux hole were analysed, and then the effects of the reflux hole area on the pressure fluctuation characteristics and performance of the pump were further researched. The results show that the differential pressure and reflux quantity is zero around the best-efficiency point. The vorticity magnitude near the exit of the reflux hole is significant, and the unsymmetrical flow structures represent periodic motion over time in the cross-section. The pressure fluctuation intensities of monitoring points P2-P5 upstream of the reflux hole were generally larger than others and decreased with a decrease in reflux hole area. With a decrease of the reflux hole area, the performance of the pump improved to some extent.

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“…Based on numerical simulation and test on impellers trimmed, Wang et al [9,10] analyzed the pressure pulsation characteristics and radial thrust behavior of a two-stage self-priming centrifugal pump after impeller trimming. Li et al [11] adopted volume of fluid (VOF) model to analyze air-liquid two-phase flow inside a self-priming pump numerically.…”

Section: Introductionmentioning

confidence: 99%

Experimental startup characteristics of a prototype pump delivering tap water

Zhang

Zhu

2019

J Braz. Soc. Mech. Sci. Eng.

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As an important period of self-priming process, the startup process of self-priming pump is inevitable. In this paper, a small overhung self-priming centrifugal pump is tested to reveal the effect of startup time on startup performance. As a first step, the startup performance of the pump delivering water is tried firstly. Through testing, the transient characteristics of performance variables against time are emphatically analyzed in three lengths of startup time/duration and four typical steady flow rates. The test results show that with extension of the startup time, the steady rotational speeds present a slight rise trend. The flow rate curves overall rapidly rise and then grow slowly. The shorter the length of the startup time, the closer the head curves tend to be linear. Conversely, the head curve more likely can be best fitted by quadratic polynomial. At the beginning of rapid startup, there is a sudden-rise-and-sudden-drop oscillation phenomenon in the inlet static pressures curves, and a pressure impact phenomenon can be found in the outlet static pressure curves. However, the above two phenomena do not exist in the moderate and slow startups. The transient characteristics of dimensionless flow rate and head are associated with the length of startup time, while the dimensionless shaft power is not. There is no similarity in transient performance between rapid, moderate, and slow startup cases.

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Effects of impeller trim on performance of two-stage self-priming centrifugal pump

Cited by 12 publications

References 10 publications

Energy Loss and Radial Force Variation Caused by Impeller Trimming in a Double-Suction Centrifugal Pump

Energy Loss and Radial Force Variation Caused by Impeller Trimming in a Double-Suction Centrifugal Pump

Effect of Reflux Hole on the Transient Flow Characteristics of the Self-Priming Sewage Centrifugal Pump

Experimental startup characteristics of a prototype pump delivering tap water

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