Experimental study on the frequency characteristics of self-excited pulsed cavitation jet

Xiang, Longhao; Wei, Xuesong; Chen, Songying

doi:10.1016/j.euromechflu.2020.04.006

Cited by 15 publications

(1 citation statement)

References 4 publications

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“…Tamaki et al [15][16][17] determined the main influences on an SOPJN's cavitation capability through numerical simulations and experiments. Xiang et al [18] researched the periodical dynamics induced by the geometric parameters and operational variables of a self-excited pulsed cavitation jet under optimum experimental conditions. They revealed the mechanism of cavitation jet occurrence by considering the jet shape, striking force, and cavity pressure.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Jet Characteristics and Pulse Mechanism of Self-Excited Oscillating Pulsed Jet Nozzle

Zhang

Sun

2021

Processes

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Self-excited oscillation pulse jet technology is widely used to clean sediment from oil storage tanks. Its successful application is dependent on jet performance. As the cleaning requirements of the oil industry increase, it is necessary to optimise the structure of self-excited oscillation pulsed jet nozzles (SOPJNs) to optimise cleaning and energy efficiencies. In this study, the jet performance of a SOPJN is modelled and analysed based on computational fluid dynamics with consideration of a large eddy simulation and homogeneous cavitation. The modelling results are highly consistent with experimental results. The effects of the SOPJN’s inlet diameter, cavity diameter, cavity length, wall reflection angle, and inlet pressure on the jet’s peak velocity, oscillation frequency, and cavitation number were analysed. The results show that the oscillation frequency decreases with the increase of the inlet diameter d1, cavity diameter D, cavity length L and reflection angle of wall α. Optimisation of the SOPJN inlet diameter, cavity length, and wall reflection angle produced a jet with a high peak velocity and strong cavitation. The optimal nozzle cavity diameter strengthens cavitation, while the peak velocity fluctuates as the cavity diameter increases. The peak velocity increases with the inlet pressure, while the increasing rate of the peak velocity decreases. The results of this study can be used in the design and optimisation of similar nozzle structures for improved pulse jet cleaning.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Jet Characteristics and Pulse Mechanism of Self-Excited Oscillating Pulsed Jet Nozzle

Zhang

Sun

2021

Processes

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Study on the development law of self-oscillating pulsed SC-CO2 jet vortex structure and its effect on frequency

Liu

Shen

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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The self-oscillating pulsed supercritical (SC)-CO2 jet technology has higher pulse pressure and the resonant rock-breaking effect, which can improve the drilling efficiency of the development of unconventional gas sources. The jet impact frequency is the key to resonance in coal rock mass; however, the relationship between frequency variation and flow field remain unknown. This study investigates the vortex change law and the effect on frequency of self-oscillating pulsed SC-CO2 jets. Large eddy simulations are used to analyze the variation characteristics of vortex structure and frequency at different locations of the jet. The results show that the variation of the vortex size in the oscillating cavity leads to the change of the jet velocity. Large-scale vortex is generated at the downstream nozzle exit and is accompanied by a high-speed zone of the jet, vortex development produces energy dissipation, which decreases the velocity in the high-speed zone. The jet frequency in the oscillating cavity is the same as the vortex ring size variation law; the vortex passing frequency in the free flow field is the same as the jet frequency, and the vortex ring energy dissipation causes the jet velocity to decrease, resulting in a lower frequency.

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Numerical investigation on the evolution of forces and energy features in thermo-sensitive cavitating flow

Liu

et al. 2020

European Journal of Mechanics - B/Fluids

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Experimental study on the frequency characteristics of self-excited pulsed cavitation jet

Cited by 15 publications

References 4 publications

Investigation of the Jet Characteristics and Pulse Mechanism of Self-Excited Oscillating Pulsed Jet Nozzle

Investigation of the Jet Characteristics and Pulse Mechanism of Self-Excited Oscillating Pulsed Jet Nozzle

Study on the development law of self-oscillating pulsed SC-CO2 jet vortex structure and its effect on frequency

Numerical investigation on the evolution of forces and energy features in thermo-sensitive cavitating flow

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