Investigation into Dynamic Pressure Pulsation Characteristics in a Centrifugal Pump with Staggered Impeller

Ni, Dan; Chen, Jinbo; Wang, Feifan; Zheng, Yuan; Zhang, Yang; Gao, Bo

doi:10.3390/en16093848

Cited by 5 publications

(3 citation statements)

References 35 publications

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“…Moreover, under high-flow conditions, the fluid is unable to form a stable vortex structure at a specific location, making the presence of vortices almost impossible to observe. Due to the uneven pressure distribution in each runner of the impeller, a total of seven monitoring points from W 1 to W 7 were set up in the impeller inlet and each runner, as shown in Figure 13, to study the pressure pulsation patterns of the impeller inlet and flow channels [33,34].…”

Section: Unsteady Flow Field Inside the Impellermentioning

confidence: 99%

“…T because under high-flow conditions, the increase in impeller inlet speed makes th dium enter the impeller channel at a higher speed, thus impacting the impeller ch and enhancing the flow regime inside the impeller. Due to the uneven pressure distribution in each runner of the impeller, a total of seven monitoring points from W1 to W7 were set up in the impeller inlet and each runner, as shown in Figure 13, to study the pressure pulsation patterns of the impeller inlet and flow channels [33,34]. For the purpose of eliminating the influence of static pressure on the flow field of the jet self-priming pump, a dimensionless coefficient Cp is applied to characterize the pressure pulsation in the flow field.…”

Section: Unsteady Flow Field Inside the Impellermentioning

confidence: 99%

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Steady and Unsteady Flow Characteristics inside Short Jet Self-Priming Pump

Yu,

Wang,

et al. 2023

Sustainability

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Due to their great efficiency and minimal loss, self-priming jet pumps are frequently employed in a variety of sectors for sustainable development. A short jet self-priming pump’s steady and unsteady flow characteristics are investigated numerically in this study using a standard k-ε turbulence model. The precision and dependability of the numerical calculations used in this work are demonstrated by the less than 2% difference between the pump performance data from the numerical calculation and the external characteristics test results for each flow condition. It was found that due to the perpendicularity of the nozzle axis to the impeller axis, the high-flow velocity zone in the nozzle gradually deviates to the side away from the impeller under high-flow conditions. Backflow is generated on the side close to the impeller, where eccentric vortices are created. As time progresses, the asymmetry of the low-pressure zone within the impeller becomes more pronounced under high-flow conditions, and the fluid is unable to form a stable vortex structure at a specific location. This is an important cause of impeller vibration and noise. The nonlinear vibration at the impeller inlet is less periodic, while the increase in flow rate can make the nonlinear vibration generated within the impeller more regular and stable. This reflects the fact that the fluid flow at small flow rates is more likely to be affected by the blade configuration and the shape of the flow channel, which leads to fluid instability and discontinuity. For various flow rates, the main frequency of the pressure pulsation is higher at the impeller intake (W1) than it is in the impeller channel (W2~7). Additionally, the pressure pulsation is more frequent before 10 times the rotational frequency, with no significant regularity. This suggests that the impeller and injector rear chamber dynamic and static interference impacts may have some bearing on the pressure pulsation. The pressure pulsation coefficients (W2~7) in the impeller at different flow rates show an exponentially decreasing trend with the increase of multiples of five in the rotation frequency. The equations for the relationship between CP and 5NF were obtained, respectively: CP-Q1 = 0.07044 × exp(−0.2372NF), CP-Q3 = 0.06776 × exp(−0.2564 NF), CP-Q5 = 0.07005 × exp(−0.2884 NF). The findings of this study contribute to understanding the flow inhomogeneities inside the pump as well as the analysis of the internal pump vibration, enhancing the jet pump’s efficiency and lifespan.

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Section: Unsteady Flow Field Inside the Impellermentioning

confidence: 99%

Section: Unsteady Flow Field Inside the Impellermentioning

confidence: 99%

Steady and Unsteady Flow Characteristics inside Short Jet Self-Priming Pump

Yu,

Wang,

et al. 2023

Sustainability

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“…In recent years, researchers have used experimental and computational fluid dynamics (CFD) methods to measure the internal flow field of centrifugal pumps [12,[24][25][26], most of which focus on single-stage spiral volute centrifugal pumps [27][28][29]. There are few studies of RCP, especially the internal flow field measured by the visualization test.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on PIV Measurement and CFD Investigation of the Internal Flow Characteristics in a Reactor Coolant Pump

Lu²,

Huang

et al. 2023

Energies

Self Cite

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The nuclear reactor coolant pump (RCP) is the core piece of equipment of a nuclear power plant (NPP). The energy performance and internal flow characteristics of RCPs are revealed by effective measurement methods, which are helpful to understand the flow mechanism of RCPs. The present work is intended to conduct an integrated study based on the energy performance test and Particle Image Velocimetry (PIV) flow-field non-contact measurement of the RCP. In addition, the prediction results of different turbulence models are compared with experimental results in detail. Through energy performance measurement and numerical calculation analysis, it can be found that various turbulence models have the ability to predict the performance of RCPs in engineering applications. At 0.8~1.2 Φd operating conditions, the maximum error is less than 10% and the minimum error is less than 0.1% by analyzing the energy performance of numerical calculations and experimental results. The PIV results show that the velocity of the discharge nozzle varies greatly from right (outlet of diffuser channel 2) to left (outlet of diffuser channel 12) due to different flow structures. Through the qualitative and quantitative comparison of the internal flow field, it can be concluded that, except for the low flow rate, compared with other computational models, the Realizable k-ε model can better predict the internal flow field of an RCP. The reasons for the experimental error and numerical calculation error are analyzed in detail, and the results can provide a reference for forecasting an RCP internal flow field with a special and complex structure.

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Exploring the mechanism of improving the pressure fluctuation of double suction centrifugal pump by impeller stagger

Liu,

Lu,

Tao

et al. 2024

Science Progress

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Background The pressure fluctuation in the volute can be effectively reduced when the impeller of the double-suction pump is staggered, but the mechanism of this reduction is still unclear. At the same time, the traditional analysis method cannot realize the visualization of pressure fluctuation. Objective The purpose of this article is to explore the spatial distribution, propagation, and attenuation law of pressure fluctuation, and on this basis, to research the reason why staggered impeller reduce pressure fluctuation. Methods A new method called Pulse tracking network (PTN) was used in this article. Compared with the traditional method, which only analyzes the pressure fluctuation at scattered points, this method greatly improves the spatial resolution of the pressure fluctuation. In particular, the phase analysis is a major highlight of the method. Results Staggered impeller significantly reduced the pressure fluctuation intensity dominated by blade passing frequency. At the same time, the propagation of the pressure fluctuation in the volute changed from radial to circumferential in the volute cross-section. Conclusions Staggered impeller can effectively reduce pressure fluctuation, and the circumferential propagation caused by it is considered to be the main reason for it.

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Investigation into Dynamic Pressure Pulsation Characteristics in a Centrifugal Pump with Staggered Impeller

Cited by 5 publications

References 35 publications

Steady and Unsteady Flow Characteristics inside Short Jet Self-Priming Pump

Steady and Unsteady Flow Characteristics inside Short Jet Self-Priming Pump

Experimental Study on PIV Measurement and CFD Investigation of the Internal Flow Characteristics in a Reactor Coolant Pump

Exploring the mechanism of improving the pressure fluctuation of double suction centrifugal pump by impeller stagger

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