Analysis of Low-frequency Pressure Pulsations in Vaneless Centrifugal Pump Volute

Huang, Xianbei

doi:10.3901/jme.2014.10.170

Cited by 5 publications

(7 citation statements)

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“…9 Gonza´lez-Pe´rez and Fernandez-Francos 10 and Pei et al 11 analyzed the effect of the operating point on the pressure fluctuations and showed that the tongue played a leading role in the impeller-volute interaction and strong increase in the magnitude of pressure fluctuations in off-design conditions. Huang and Liu 12 analyzed low-frequency pressure pulsations in vaneless centrifugal pump volute and found that the eddies generated as a result of streamline distortion resulted in low-frequency pressure pulsation. Yao et al 13 investigated the time frequency characteristics of pressure fluctuations in a double-suction centrifugal pump by using flush mounted pressure transducers in a semi-spiral suction chamber and the volute casing.…”

Section: Introductionmentioning

confidence: 99%

“…11 analyzed the effect of the operating point on the pressure fluctuations and showed that the tongue played a leading role in the impeller–volute interaction and strong increase in the magnitude of pressure fluctuations in off-design conditions. Huang and Liu 12 analyzed low-frequency pressure pulsations in vaneless centrifugal pump volute and found that the eddies generated as a result of streamline distortion resulted in low-frequency pressure pulsation. Yao et al.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and experimental investigations of pressure fluctuations in single-channel pumps

Tan

Shi

Stankovic

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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To elucidate the characteristics and generation mechanism of pressure fluctuations in single-channel pumps, the unsteady flow in three single-channel pumps with the same impeller equipped with a spiral volute (model 1), a circular volute (model 2), and a torus (model 3) were analyzed by computational fluid dynamics. Experiments on global performance characteristics in the volute of model 1 were performed, and fast response pressure sensors were installed in the spiral volute to measure pressure fluctuations. The results indicate that the numerical results are in good agreement with the experimental results. This study shows that a phase delay exists between different volute monitoring points and the pressure fluctuations in the volute are mainly caused by the potential interactions between the impeller blade and volute wall. Comparison of the pressure fluctuations amplitude of the impeller outlet shows that pressure fluctuation amplitude of model 3 is one order of magnitude lower than those of the others and the wake at the impeller outlet played an important role in pressure fluctuations. The standard deviation of pressure was introduced to describe the pressure fluctuations strength. It shows that the pressure fluctuation strength of the pressure surface is apparently higher than that of the suction surface, and the maximum pressure fluctuation strength in the blade is consistent with the flow separation area, indicating that flow separation is also an important factor for pressure fluctuations in single-channel pumps.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigations of pressure fluctuations in single-channel pumps

Tan

Shi

Stankovic

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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show abstract

“…Blade passing frequency (BPF), rotor passing frequency (RPF), and low-frequency disturbance in the pressure spectrum were found to influence pump vibration and performance significantly. [23][24][25][26][27] Zhang et al 25 demonstrated that high amplitudes of low-frequency disturbance are induced by unsteady flow structures, which reduce pump performance and induce rotating stall. Huang et al 26 concluded that lowfrequency disturbance is related to vortexes near the volute tongue caused by streamline distortion.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of performance degradation in a double-suction centrifugal pump under inflow distortions

Wang

Liu

Jiang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Inlet pipes of the centrifugal pump are generally bent to fit in the limited installation space, which can cause inflow distortions for two sides of the double-suction impeller. This study aimed to understand the effect of primary geometric parameters of inlet pipes, including corner angle, straight pipe length downstream of elbow, and turning radius, on pump performance and pressure fluctuations. The pump head, efficiency, and pressure fluctuations were measured for six kinds of inlet pipes in the experiment. Unsteady numerical simulations were performed to understand the flow mechanisms. Results indicate that the bending of inlet pipes is a significant reason for the loss of pump head and efficiency. The penalty on pump performance is augmented by the increase in corner angle, decrease in turning radius, and installation of a short straight pipe downstream of the elbow. Pump efficiency could be maximally reduced by 6.58% with a large corner angle and a small turning radius. The bending of inlet pipes induces pressure imbalance for the two sides of the impeller and increases low-frequency disturbance in the suction chamber, which are responsible for the performance loss. Numerical results reveal that the low-frequency disturbance is caused by the vortex formed in the suction chamber, and the accompanying secondary vortex aggravates the pressure fluctuation synchronously. Parametric studies conclude that the corner angle should be minimized to reduce the penalty on pump performance and pressure fluctuations, and a long straight pipe downstream of the elbow can be installed to decrease vibration for the pump with bent inlet pipes.

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“…Li et al 20 found that the change of the number and width of impeller back pump-out vanes in the screw centrifugal pump has great influence on the distribution of the pressure in seal chamber and volute casing. Huang and Liu 21 employed CFD method to indicate that the key cause of low-frequency pressure pulsation is the eddies generated due to streamline distortion. Based on the detached eddy simulation (DES) model, Zhou et al 22 put forward the impeller design method to optimize the anti-missile blade, reduce the flow loss between the guide vanes, and improve the performance of a multistage centrifugal pump.…”

Section: Introductionmentioning

confidence: 99%

Efficiency improvement and evaluation of a centrifugal pump with vaned diffuser

Wang

Jing

et al. 2019

Advances in Mechanical Engineering

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In order to enhance the efficiency of centrifugal pump, the structure of a centrifugal pump with vaned diffuser, whose specific speed is 190, was numerically improved by trimming back-blades of impeller and smoothing sharp corner in annular chamber. The energy performance, the internal flow field, the axial force, the radial force, and the pressure pulsation of the pump were analyzed. Results show that efficiency of the improving scheme 1 under the design flow rate is 77.47%, which can balance 69.82% of the axial force, while efficiency of the improving scheme 2 under the design flow rate is the maximum, which could still balance 62.74% of the axial force. The pressure pulsations of the improving scheme 2 at the typical monitoring points are less than that of the improving scheme 1 and the original scheme. The difference of the radial force peak between the improving scheme 1 and the improving scheme 2 is very small. The vector distributions of the radial force of the improving scheme 1 and the improving scheme 2 are more uniform than that of the original scheme. Considering the efficiency, pressure pulsation, and axial force, experiment measurements on the improving scheme 2 were carried out to verify the effectiveness of the improvement result. Results of energy performance experiment show that efficiency of the improving scheme 2 under the design flow rate is 76.48%, which is 5.26 percentage points higher than that of the original scheme.

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Analysis of Low-frequency Pressure Pulsations in Vaneless Centrifugal Pump Volute

Cited by 5 publications

References 0 publications

Numerical and experimental investigations of pressure fluctuations in single-channel pumps

Numerical and experimental investigations of pressure fluctuations in single-channel pumps

Mechanisms of performance degradation in a double-suction centrifugal pump under inflow distortions

Efficiency improvement and evaluation of a centrifugal pump with vaned diffuser

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