Numerical and Experimental Analysis of Flow Phenomena in a Centrifugal Pump Operating Under Low Flow Rates

Fu, Ying-Shuang; Yuan, Jianping; Yuan, Shouqi; Pace, Giovanni; d’Agostino, Luca; Huang, P. G.; Li, Xiaojun

doi:10.1115/1.4027142

Cited by 92 publications

(39 citation statements)

References 26 publications

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“…In Cs7, the intensity of vortices is observed around the periphery of cross sections and minimal at the core, this ensure the helicity (product of vorticity and velocity) at that section [25]. Even for end suction centrifugal pump, Fu et al [26] confirmed the presence of low frequency oscillation of inlet pressure near the impeller eye by means of fast response pressure transducers. Similar kind of cross sectional studies can be extended to other flow rates for more detailing of inlet pipe flow passage.…”

Section: Source Of Noise Across Cross Sections At 05qnmentioning

confidence: 79%

Study of Flow Induced Noise in Vertical Inline Pump Using Lighthill Analogy

Stephen

Yuan

Pei

et al. 2018

MATEC Web of Conferences

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Abstract. The pump user demands for specification along with noise and vibration magnitude for extreme operating conditions apart from best efficiency flow. In order to predict the noise level in pumps, the entire unit of pump has to be considered for acoustic evaluation. Hence, the full three dimensional model of vertical inline pump which consists of inlet pipe, impeller, and volute casing is considered for detailing the flow induced noise using Lighthill analogy. The performance characteristics of pump are well matched between experimental and computational results and the overall sound power level at best efficiency flow using computation was compared with empirical relations and found to be agreed well. The streamline patterns along the inlet pipe shows the effects of recirculation and return flow at partload condition and confirm that the utilization of flow passage is not well streamlined even for nominal flow rate. Further, the detailed study of inlet pipe cross sections reveals the nature of different noise sources such as dipole and quadrupole sound levels along with Proudman source power level. The intensity of turbulence and vortices in flow passage is predicted well using quadrupole source and Proudman sound power levels.

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Section: Source Of Noise Across Cross Sections At 05qnmentioning

confidence: 79%

Study of Flow Induced Noise in Vertical Inline Pump Using Lighthill Analogy

Stephen

Yuan

Pei

et al. 2018

MATEC Web of Conferences

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“…It is observed that angular distribution of pressure amplitude at f BPF exhibits a modulated pattern characterized by the presence of six local peaks and valleys. The modulation pattern is closely associated with rotor-stator interaction inside the model pump [22] and [23]. At off-design conditions, especially at flow rates of 0.2 Q d and 1.4 Q d , pressure amplitudes are much larger than that at the rated condition.…”

Section: Unsteady Pressure Pulsationsmentioning

confidence: 93%

Investigation of Rotor-Stator Interaction and Flow Unsteadiness in a Low Specific Speed Centrifugal Pump

Zhang

Yang

Gao

et al. 2016

SV-JME

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Instantaneous flow dynamics induced by rotor-stator interaction are detrimental to the stable operation of centrifugal pumps. In this study, unsteady rotor-stator interaction and flow structures within a low specific-speed centrifugal pump are analysed using the Large Eddy Simulation (LES) method. For that purpose, pressure pulsations and the evolution processes of vortical structures are combined to investigate rotor-stator interaction in order to clarify the inherent correlation between pressure amplitude and vorticity distribution. The results show that distinct peaks at blade passing frequency (f BPF) are closely associated with the positions of the monitoring point due to rotor-stator interaction. An unsteady vortical structure at the near tongue region is related to the relative position of the impeller with respect to the tongue, and the upstream effect of the volute tongue significantly affects the vorticity distribution on the blade pressure side. Rotor-stator interaction is dominated by vortex shedding in the wake of the blade trailing edge and their impingement on the volute tongue with subsequent cutting and distortion. Moreover, the high-pressure amplitude is generated with the corresponding high vorticity magnitude observed as well. Therefore, it is confirmed that pressure amplitude is significantly associated with the corresponding vorticity magnitude.

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“…Under part-load and overload conditions, the flow in centrifugal pumps is extremely unstable [2,3]. Unstable flow structures, such as return vortex at the tongue, shedding vortex at the blade trailing edge and return vortex at the inlet or outlet, will occur in centrifugal pumps when they are operated under part-load conditions [4][5][6]. The rotor-stator interaction at the tongue and the shedding vortex at the blade trailing edge are the main causes of unstable pressure pulsation in centrifugal pumps [7,8].…”

Section: Introductionmentioning

confidence: 99%

Influence of Cutting Angle of Blade Trailing Edge on Unsteady Flow in a Centrifugal Pump Under Off-Design Conditions

Cui

Zhang

et al. 2020

Applied Sciences

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The parameters of blade trailing edge have an important influence on the performance of centrifugal pump and internal unstable flow. In this study, the influences of cutting angles of blade trailing edge on unstable pressure pulsation and unstable flow structure are investigated using a centrifugal pump under off-design conditions through large eddy simulation. Three typical blade trailing edges, namely, original trailing edge (OTE), 15° cutting angle of blade trailing edge (OBS15) and 30° cutting angle of blade trailing edge (OBS30), are analysed. Results show that the cutting angle of blade trailing edge has a certain effect on the performance of the centrifugal pump. Under part-load conditions, the OBS30 impeller evidently contributes to the reduction in pressure pulsation intensity. By contrast, the OBS15 impeller has opposite effect because of the increase in wake vortex intensity. The OBS30 impeller can effectively improve the unstable vortex structure caused by backflow at the centrifugal pump tongue using a new Ω method. Consequently, reduction in the unstable flow structure mainly contributes to the reduction in pressure pulsation used by the proper cutting angle of blade trailing edge.

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Numerical and Experimental Analysis of Flow Phenomena in a Centrifugal Pump Operating Under Low Flow Rates

Cited by 92 publications

References 26 publications

Study of Flow Induced Noise in Vertical Inline Pump Using Lighthill Analogy

Study of Flow Induced Noise in Vertical Inline Pump Using Lighthill Analogy

Investigation of Rotor-Stator Interaction and Flow Unsteadiness in a Low Specific Speed Centrifugal Pump

Influence of Cutting Angle of Blade Trailing Edge on Unsteady Flow in a Centrifugal Pump Under Off-Design Conditions

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