Study on Pressure Pulsation Induced by Cavitation at the Tongue of the Volute in a Centrifugal Pump

Lu, Junfu; Luo, Zhaoyun; Qi, Chen; Liu, Xiaobing; Zhu, Baoshan

doi:10.1007/s13369-022-06829-y

Cited by 8 publications

(5 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years, it has also been found that the pressure pulsation caused by cavitation inside the volute has also been of great research significance. Lu et al [103] studied the cavitation of the volute tongue and its induced pressure pulsation characteristics. Under the operating conditions of large flow, the pressure pulsation around the tongue has the same period in the time domain, the main frequency amplitude of the pressure pulsation decreases, and broadband pulsation occurs in the low-frequency range.…”

Section: Combination Of Noise Measurement and Vibrationmentioning

confidence: 99%

A Review of Pump Cavitation Fault Detection Methods Based on Different Signals

et al. 2023

View full text Add to dashboard Cite

As one of the research hotspots in the field of pumps, cavitation detection plays an important role in equipment maintenance and cost-saving. Based on this, this paper analyzes detection methods of cavitation faults based on different signals, including vibration signals, acoustic emission signals, noise signals, and pressure pulsation signals. First, the principle of each detection method is introduced. Then, the research status of the four detection methods is summarized from the aspects of cavitation-induced signal characteristics, signal processing methods, feature extraction, intelligent algorithm identification of cavitation state, detection efficiency, and measurement point distribution position. Among these methods, we focus on the most widely used one, the vibration method. The advantages and disadvantages of various detection methods are analyzed and proposed: acoustic methods including noise and acoustic emission can detect early cavitation very well; the vibration method is usually chosen first due to its universality; the anti-interference ability of the pressure pulsation method is relatively strong. Finally, the development trend of detecting cavitation faults based on signals is given: continue to optimize the existing detection methods; intelligent algorithms such as reinforcement learning and deep reinforcement learning will be gradually integrated into the field of cavitation status identification in the future; detection systems still need to be further improved to accommodate different types of pumps; advanced sensing devices combined with advanced signal processing techniques are one of the effective means to detect cavitation in a timely manner; draw on other fault detection methods such as bearing faults and motor faults.

show abstract

Section: Combination Of Noise Measurement and Vibrationmentioning

confidence: 99%

A Review of Pump Cavitation Fault Detection Methods Based on Different Signals

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Through visualization experiments, Rudolf Bachert et al found that the cloud cavitation phenomenon at the tongue presents a periodic evolution, and its rule is similar to the cavitation phenomenon on a single hydrofoil, but the source of instability is different [4]. LU et al numerically simulated the unstable cavitation characteristics under large flow and found that in the initial stage of unstable cavitation, the cavitation at the tongue was caused by the flow separation at the lowvelocity area of the impeller outlet and the tongue, and the secondary flow generated by the flow separation would aggravate the development of the tongue cavitation [5]. Yuan et al investigated the three modes of cavitation development at the tongue through visualization experiments and found that in the bubble cavity stage, the rotor-stator interaction between the impeller and volute was the main reason affecting cavitation [6].…”

Section: Introductionmentioning

confidence: 99%

“…When cavitation occurs, the growth, shedding and collapse of the cavity will affect the stability of the flow, thus inducing pressure pulsation. At this time, the pressure pulsation at the tongue is mainly determined by the separation vortex, attached vortex, and static and static interference between the impeller and the tongue [5].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Unsteady Cavitation at the Tongue of a Centrifugal Pump

Zhou,

Zhang,

Yuan

et al. 2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The flow separation at the tongue of the centrifugal pump will cause a sharp reduction of local pressure, thus inducing the cavitation phenomenon, which hurts the stable operation of the pump. This article focuses on the centrifugal pump as the research object. The Delayed Detached Eddy Simulation (DDES) method based on the SST turbulence model was employed to numerically simulate the cavitation at the tongue of the centrifugal pump. The typical characteristics and unsteady changes of cavitation were observed and studied, and the pressure at the tongue position was monitored for flow rates of 1.36 Q 0 and 1.54 Q 0. The results show that, in the cloud cavitation stage, the area of the cavitation bubble presents periodic changes, the main frequency of the cavitation area pulsation is twice the axial frequency, the periodic shedding of the cavitation bubble is caused by the attached vortex (re-entrant jet) and the pressure gradient, and the wall attached vortex will periodically shed and break. The high intensity vortices generated by flow separation at the tongue will change periodically with the rotation of the blade. With the increase of inlet flow, the pressure pulsation at the tongue increases, and the shedding and collapse of the cavitation bubble will enhance the pressure pulsation.

show abstract

“…When the blade was close to the cutwater, the fluctuation intensity of the pressure was relatively lower, and the radial forces on the impeller were higher. Lu et al [28] studied the characteristics of pressure fluctuations at the cutwater, where pressure fluctuations were mainly influenced by the separation vortex and dynamic-static interference. Ding et al [29] found that blade trimming significantly reduced pressure pulsation and improved internal flow in centrifugal pumps.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Unsteady Flow Characteristics Near the Cutwater by Cutting Impeller Hub in a High-Speed Centrifugal Pump

Cui,

Shi

2024

JMSE

View full text Add to dashboard Cite

Centrifugal pumps are essential fluid transfer devices in marine engineering. As the two most critical components of a centrifugal pump, the dynamic–static interference between the volute and the impeller makes the flow near the cutwater highly unstable, with significant and erratic pressure pulsation, which seriously affects the stability of the operation. The impeller can be improved by cutting the hub, which helps stabilize the flow and reduce pressure pulsation near the cutwater, thus minimizing hydraulic loss. In this study, four different cutting angles were applied to the impeller hub. Computations are conducted using large eddy simulation to analyze the flow and pressure pulsation near the cutwater. Compared to the prototype pump, the modified impeller exhibits a significant reduction in pressure gradient near the blade outlet close to the cutwater. The modified impeller also shows a more uniform flow and lower amplitude of pressure pulsation. Furthermore, under various flow conditions, the centrifugal pump with the modified impeller exhibits lower hydraulic loss compared to the prototype pump, indicating that this method effectively suppresses hydraulic loss.

show abstract

Study on Pressure Pulsation Induced by Cavitation at the Tongue of the Volute in a Centrifugal Pump

Cited by 8 publications

References 31 publications

A Review of Pump Cavitation Fault Detection Methods Based on Different Signals

A Review of Pump Cavitation Fault Detection Methods Based on Different Signals

Numerical Simulation of Unsteady Cavitation at the Tongue of a Centrifugal Pump

Analysis of Unsteady Flow Characteristics Near the Cutwater by Cutting Impeller Hub in a High-Speed Centrifugal Pump

Contact Info

Product

Resources

About