Experimental Investigation of Pressure Fluctuation, Vibration, and Noise in a Multistage Pump

Wang, Kai; Zhang, Zixu; Xia, Chen; Liu, Zhongchun

doi:10.1155/2018/2784079

Cited by 13 publications

(13 citation statements)

References 16 publications

(12 reference statements)

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“…Therefore, the volume fraction of vapor has a periodic oscillation relationship, which is inversely proportional to the head. To analyze the frequency characteristic of pressure fluctuation, time domain data is transferred to frequency domain using fast Fourier transform (FFT) [32][33][34]. Figure 19a shows the frequency spectrum of head fluctuation in impeller, Figure 19b shows the local frequency spectrum, the range is 0~100 Hz.…”

Section: Unsteady Cavitation Evolution In Ecwpmentioning

confidence: 99%

Numerical Simulation of Cavitation Performance in Engine Cooling Water Pump Based on a Corrected Cavitation Model

Shi

et al. 2020

Processes

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To analyze the internal flow of the engine cooling water pump (ECWP) under thermodynamic effect, Zwart cavitation model based on the Rayleigh-Plesset equation is corrected, and NACA0015 hydrofoil was selected to verify the corrected model. The cavitation performances of ECWP with different temperatures were numerically simulated based on a corrected cavitation model. Research results show that simulation values of pressure distribution coefficient in hydrofoil surface at 70 °C are in closest agreement with experimental values when the evaporation and condensation coefficients are 10 and 0.002, respectively. With the decrease of absolute pressure in pump inlet, bubbles firstly occurred at the blade inlet side near the suction surface and then gradually extended to the pressure surface, finally clogged the impeller passage. Compared to the inlet section, the cavitation degree is much more serious close to the trailing edge. With the temperature increases, the cavitation in ECWP occurs in advance and rapidly, and the temperature plays an important role in promoting cavitation process in ECWP. Based on the unsteady simulation of ECWP, the influence of cavitation on the performance characteristics is studied. The results provide a theoretical reference for the prediction and optimization of the cavitation performance in ECWP.

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Section: Unsteady Cavitation Evolution In Ecwpmentioning

confidence: 99%

Numerical Simulation of Cavitation Performance in Engine Cooling Water Pump Based on a Corrected Cavitation Model

Shi

et al. 2020

Processes

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“…[3][4][5] In recent years, scholars have done numerous researches on the vibration and noise in the pump and obtained encouraging achievements. Wang et al 6 experimentally studied vibration, and noise characteristics of a five-stage centrifugal pump in different flow rate. Cernetic 7 adopted vibration and noise detection technology to monitor the cavitation in kinetic pumps.…”

Section: Introductionmentioning

confidence: 99%

Vibration control of a marine centrifugal pump using floating raft isolation system

Liu

et al. 2019

Journal of Low Frequency Noise, Vibration and Active Control

Self Cite

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In order to study the influence of floating raft isolation system (FRIS) on the vibration characteristics of marine pump, a marine centrifugal pump with/without FRIS under the same operation condition, which specific speed is 66.7, was experimentally measured. The maximum efficiency of the pump is 75.8%, which is under 1.2 Qd. Results show that the characteristic frequencies in the vibration spectrums of the pump with/without FRIS are APF (axial passing frequency), the BPF (blade passing frequency) and its high-order harmonic frequency. After installing FRIS, under 0.8 Qd, 1.0 Qd and 1.2 Qd, the vibration intensity of the pump at inlet flange is slighter than that at pump base and larger than that at pump bracket. The vibration intensity at outlet flange is slighter than that at the pump bracket and larger than that at pump body, and the vibration intensity at connecting plate is the lowest. The vibration velocity level of pump base decreases with the increase of flow rate, the maximum vibration intensity at M1–M4 is reduced by 88% than that without FRIS, and the maximum vibration velocity of the APF at M1–M4 is reduced by 83.3% than that without FRIS.

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“…According to the hybrid method, when the flow field simulation was completed, the wall pressure fluctuation in time domain was extracted and transformed into dipole acoustic source, then the noise signal in frequency domain was obtained. Based on the hybrid method, scholars explored the noise changing trend under different operation conditions, noise distribution characteristics, and the effect of different pump structures on noise [12][13][14][15]. Liu et al [16] also compared the influence of different dipole sources on acoustic calculation results.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on the Distribution and Evolution Characteristics of an Acoustic Field in the Time Domain of a Centrifugal Pump Based on Powell Vortex Sound Theory

2019

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The acoustic field distribution and evolution characteristics in a time domain inside a centrifugal pump are studied. During the fluid motion process, the acoustic source and acoustic pressure are basically less than 0, and the minimum value of the two parameters is distributed near the tongue. Additionally, the concentration, break, extend, migration and reaggregation phenomena of the minimum acoustic source region exist. Specifically, as the blade passes through the tongue, the minimum acoustic source region concentrates on the tongue firstly, then extends and migrates downstream slightly with the blade motion, and aggregates again around the tongue, which results in the similar evolution characteristics of acoustic pressure. Moreover, the standard deviation (STD) of acoustic source mainly focuses near the pressure side of blade tail and volute tongue, and the maximum STD is located at the tongue. Compared with the source component induced by stretching of the vortex, the source component induced by non-uniformity of fluid kinetic energy is closer to the overall acoustic source. Take the tongue as an example, at various rotational speeds, the STD proportions of the two components are about 5% and 95%, respectively. This study discusses the generation, distribution and evolution characteristics of acoustic field, which lays a foundation to analyze the acoustic field propagation mechanism of centrifugal pumps.

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Experimental Investigation of Pressure Fluctuation, Vibration, and Noise in a Multistage Pump

Cited by 13 publications

References 16 publications

Numerical Simulation of Cavitation Performance in Engine Cooling Water Pump Based on a Corrected Cavitation Model

Numerical Simulation of Cavitation Performance in Engine Cooling Water Pump Based on a Corrected Cavitation Model

Vibration control of a marine centrifugal pump using floating raft isolation system

A Numerical Study on the Distribution and Evolution Characteristics of an Acoustic Field in the Time Domain of a Centrifugal Pump Based on Powell Vortex Sound Theory

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