PIV measurements of the unsteady flow structures in a volute centrifugal pump at a high flow rate

Keller, Jens; Blanco, Eduardo; Barrio, Raúl; Parrondo, Jorge

doi:10.1007/s00348-014-1820-7

Cited by 87 publications

(27 citation statements)

References 31 publications

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“…emerges adjacent to the suction side of blade, according to relevant references [23,24]. For prototype runner at flow rate 475.8 kg/s, three high radial velocity regions located evenly at runner outlet can be observed from the passage midplane to the hub.…”

Section: Resultsmentioning

confidence: 98%

Effects of the Splitter Blade on the Performance of a Pump-Turbine in Pump Mode

Wang

Cao

et al. 2018

Mathematical Problems in Engineering

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The pumped hydro energy storage is the most effective way to store large-scale electricity and has been widely used in the world. As the key equipment in the pumped hydro energy storage, it is significant and urgent to improve the performance and operation stability of the pump-turbine. In this study, the effect of runners with and without splitter blade on the performances and inner flow characteristics of a pump-turbine in pump mode was analyzed by the method of numerical calculation. The results suggest that larger tangential velocity at runner outlet and higher pressure at the trailing edge of pressure side in splitter blade runner scheme contribute to higher head. The area of backflow at runner outlet, the highest values of entropy generation rate, and vorticity distribution in splitter blade runner scheme are well smaller than those in prototype runner without splitter blade, which is conducive to improving model performance.

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Section: Resultsmentioning

confidence: 98%

Effects of the Splitter Blade on the Performance of a Pump-Turbine in Pump Mode

Wang

Cao

et al. 2018

Mathematical Problems in Engineering

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“…Chu and Dong [13,14] found that the unsteady flow pattern and the rotor-stator interaction are two main excitation components of the pressure pulsations and noise. Keller et al [15] used particle image velocimetry technology to measure the rotor-stator interaction, and found that the vortex sheds from trailing edge and affects the flow field in the volute, their collision generates strong pressure pulsation. Jia [16] explored the pressure distribution in a low-specific-speed centrifugal pump, and found that the asymmetry of pressure distribution is caused by the tongue.…”

Section: Introductionmentioning

confidence: 99%

The Role of Blade Sinusoidal Tubercle Trailing Edge in a Centrifugal Pump with Low Specific Speed

Jia

et al. 2019

Processes

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Pressure pulsations may cause high-amplitude vibrations during the process of a centrifugal pump. The trailing edge shape of the blade has a critical influence on the pump’s pressure fluctuation and hydraulic characterization. In this paper, inspired by the humpback whale flipper, the authors research the impact of applying the sinusoidal tubercles to the blade suction side of the trailing edge. Numerical calculation and experiments are carried out to investigate the impact of the trailing edge shape on the pressure pulsations and performance of a centrifugal pump with low specific speed. Two designed impellers are tested, one is a sinusoidal tubercle trailing edge (STTE) impeller and the other is the original trailing edge (OTE) prototype. The detailed study indicates that the sinusoidal tubercle trailing edge (STTE) reduces pressure pulsation and enhances hydraulic performance. In the volute tongue region, the pressure pulsation amplitudes of STTE at fBPF decrease significantly. The STTE impeller also effectively changes the vortex structure and intensity in the blade trailing edge area. This investigation will be of great benefit to the optimal design of pumps.

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“…González [2] captured the unsteady flow effects inside a centrifugal pump due to the impeller-volute interaction with a numerical simulation and provided the modeling possibilities for the prediction of the dynamic interaction between the flow at the impeller exit and the volute tongue. Keller [3] investigated the unsteady flow in a centrifugal pump with vaneless volute based on PIV measurements. The obtained data show that the fluid-dynamic blade-tongue interaction is dominated by high-vorticity sheets (positive and negative) being shed from the impeller channels, especially from the blade trailing edges, and their impingement on the tongue tip with subsequent.…”

Section: Introductionmentioning

confidence: 99%

Study on Flow Characteristics in Volute of Centrifugal Pump Based on Dynamic Mode Decomposition

2019

Mathematical Problems in Engineering

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To investigate the unsteady flow characteristics and their influence mechanism in the volute of centrifugal pump, the Reynolds time-averaged N-S equation, RNG k-ε turbulence model, and structured grid technique are used to numerically analyze the transient flow-field characteristics inside the centrifugal pump volute. Based on the quantified parameters of flow field in the volute of centrifugal pump, the velocity mode contours and oscillation characteristics of the mid-span section of the volute of centrifugal pump are obtained by dynamic mode decomposition (DMD) for the nominal and low flow-rate condition. The research shows that the first-order average flow mode extracted by DMD is the dominant flow structure in the flow field of the volute. The second-order and third-order modes are the most important oscillation modes causing unsteady flow in the volute, and the characteristic frequency of the two modes is consistent with the blade passing frequency and the 2x blade passing frequency obtained by the fast Fourier transform (FFT). By reconstructing the internal flow field of the volute with the blade passing frequency for the nominal flow-rate condition, the periodic variation of the unsteady flow structure in the volute under this frequency is visually reproduced, which provides some ideas for the study of the unsteady structure in the internal flow field of centrifugal pumps.

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PIV measurements of the unsteady flow structures in a volute centrifugal pump at a high flow rate

Cited by 87 publications

References 31 publications

Effects of the Splitter Blade on the Performance of a Pump-Turbine in Pump Mode

Effects of the Splitter Blade on the Performance of a Pump-Turbine in Pump Mode

The Role of Blade Sinusoidal Tubercle Trailing Edge in a Centrifugal Pump with Low Specific Speed

Study on Flow Characteristics in Volute of Centrifugal Pump Based on Dynamic Mode Decomposition

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