The Analysis of Cavitation Flow and Pressure Pulsation of Bi-Directional Pump

Liu, Haiyu; Tang, Fangping; Shi, Lijian; Dai, Liang; Shen, Jie; Liu, Jian

doi:10.3390/jmse11020268

Cited by 9 publications

(5 citation statements)

References 36 publications

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“…The high rotating speed of blades produces local cavitation when a CFF operates underwater [37], which dramatically induces unstable, irregular, and random changes in the lift and thrust and thus greatly affects the efficiency of the CFF. This is a fatal problem for the propeller of submersible aircraft.…”

Section: Cff Operating Underwatermentioning

confidence: 99%

Numerical Study on Fluid Dynamic Characteristics of a Cross-Flow Fan

Cai

Zhang

Wang

2023

JMSE

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This paper focuses on the application of a cross-flow fan (CFF) to generate propulsion for a submersible aircraft with a flying wing configuration. A numerical method is established to simulate the CFF operating both in the air and underwater. This paper then investigates the fluid dynamic characteristics of the CFF, including the velocity field, the pressure field, the cavitation distribution, the lift, and the thrust. It is concluded that proper lifts and thrusts can be obtained when the rotating speed and the angle of attack are reasonably designed. This work provides a valuable numerical methodology for studying the fluid dynamic characteristics of the CFF operating in different media and offers a technical basis for the selection of a motor system for submersible aircraft.

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Section: Cff Operating Underwatermentioning

confidence: 99%

Numerical Study on Fluid Dynamic Characteristics of a Cross-Flow Fan

Cai

Zhang

Wang

2023

JMSE

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“…It was found that liquid-loaded noise has higher sensitivity to the change in cavitation, and the signal spectrum is concentrated in the 2000~3000 Hz range and below 100 Hz, which is suitable for large pumps. The effect of cavitation on pressure pulsation needs to be combined with flow conditions and location [99]. The research on the pressure pulsation characteristics induced by cavitation in the pump mainly focuses on four parts: inlet, outlet, volute, and impeller.…”

Section: Combination Of Noise Measurement and Vibrationmentioning

confidence: 99%

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

et al. 2023

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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.

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“…Han et al [5,6] applied large eddy simulation in conjunction with the Zwart-Gerber-Belamri cavitation model to numerically analyze turbulent cavitation flow near the tip clearance of a propulsion pump. In the experiment, Liu et al [7]. used high-speed photography and pressure pulsation sensors to study tip clearance cavitation in a bidirectional axial flow pump station.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Tip Clearance on Cavitation Performance and Entropy Production of an Axial Flow Pump

Yu,

Cheng,

et al. 2024

JMSE

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The clearance existing between the impeller rim and the adjacent shroud within the pump configuration establishes conducive circumstances for the initiation of cavitation. The bubbles generated by cavitation will flow forward with the water, blocking the channel, and result in the degradation of the pump performance. When the cavitation is severe, vibration and noise will be generated. The impact formed by the collapse of the bubbles will seriously erode the blades and form pits on the blade surfaces. Drawing upon the outcomes derived from numerical simulations, this paper investigates the relationship between tip clearance and cavitation in an axial flow pump, with a specific focus on energy dissipation characteristics. The principal findings indicate that the dimensions of the tip clearance predominantly influence the spatial distribution of the tip leakage vortex (TLV) cavitation. The entropy production rate distribution at the tip correlates with both the cavitation level of the pump and the extent of the tip clearance. The shedding phenomenon of the TLV becomes more evident when analyzing the distribution of entropy production rates. During cavitation, an increased tip clearance is associated with a reduction in the dissipation of viscous entropy production within the impeller domain, and the entropy production resulting from turbulent dissipation significantly surpasses that arising from viscous dissipation.

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The Analysis of Cavitation Flow and Pressure Pulsation of Bi-Directional Pump

Cited by 9 publications

References 36 publications

Numerical Study on Fluid Dynamic Characteristics of a Cross-Flow Fan

Numerical Study on Fluid Dynamic Characteristics of a Cross-Flow Fan

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

Study on the Influence of Tip Clearance on Cavitation Performance and Entropy Production of an Axial Flow Pump

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