The influence of collapse wall on self-excited oscillation pulsed jet nozzle performance

Fang, Zhenlong; Kang, Yong; Yang, Xiaobin; Yuan, Bo; Li, D

doi:10.1088/1755-1315/15/5/052022

Cited by 6 publications

(7 citation statements)

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“…Moreover, it has been put forward in some literature that further analysis and attentions should be given to jet-target interaction to better distinguish the mechanism of self-excited jet. 10,11 Most importantly, both of our previous experimental and numerical studies 24,25 have already found that the geometry of impinging wall greatly influences the pressure characteristics of selfexcited pulsed waterjets issuing from Helmholtz oscillators.…”

Section: Introductionmentioning

confidence: 98%

Effects of the geometry of impinging surface on the pressure oscillations of self-resonating pulsed waterjet

Deng

Kang

Ding

et al. 2017

Advances in Mechanical Engineering

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A preliminary experimental investigation was performed with a focus on the axial pressure oscillations of self-resonating pulsed waterjet under different impinging surfaces. Five target plates of different impinging surfaces were impinged by self-resonating pulsed waterjets at various standoff distances and under four inlet pressures. It was found that the geometry of impinging surface significantly affects the pressure oscillation peak and amplitude of self-resonating pulsed waterjet, and the influences largely depend on the inlet pressure. Both the pressure oscillation peak and the amplitude increase to their maximum and then drop with increasing standoff distance, which is regardless of the geometry of impinging surface. But the geometry influences the values of the optimum standoff distance and the oscillation peak and amplitude. Compared with the trend of pressure oscillation peak against standoff distance, the oscillation amplitude can be more obviously changed by the impinging surface. Moreover, an assumption that the geometry affects the pressure oscillation peak by the rebound waterjets and hydroacoustic waves has been proposed based on related literature. Further study should be conducted to clarify the relations between the axial pressure oscillation and the geometry of impinging surface.

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Section: Introductionmentioning

confidence: 98%

Effects of the geometry of impinging surface on the pressure oscillations of self-resonating pulsed waterjet

Deng

Kang

Ding

et al. 2017

Advances in Mechanical Engineering

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“…Through the analysis, in the experiment process, the selfexcited oscillation nozzle exhibits the cavitation phenomenon. However, in the process of simulation, the cavitation problem is seldom considered, which makes the pressure wave velocity in the cavity higher than the cavitation condition, which results in a higher frequency of the simulated pulsed jet [6].…”

Section: Resultsmentioning

confidence: 99%

“…The study of the internal flow field characteristics of self-excited oscillating nozzles is usually carried out by experimental research [19] and theoretical research [6]. At present, the research mainly focuses on the study of the pressure characteristics inside the self-excited oscillating nozzle [31], while research on the velocity characteristics of the pulsed jet is rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Study on velocity and pressure characteristics of self-excited oscillating nozzle

Zhang

Nie

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The mechanism of the self-excited oscillation pulsed jet is still in a period of continuous improvement, and the application breadth and depth of the self-excited oscillation nozzle are significantly limited since the turbulent flow field inside the self-excited oscillation nozzle is exceptionally complex. In this study, computational fluid dynamics numerical simulation and experimental research methods are combined. By changing the structural parameters of self-excited oscillating nozzles, the velocity and pressure characteristics of the self-excited oscillating nozzles were compared and analyzed to determine the important factors that influenced the effect of pulsed jet. These findings demonstrated that the periodic expansion and contraction of the low-pressure vortex ring in the self-excited oscillation nozzle chamber will cause the pressure of the nozzle outlet section to change periodically. The periodic high-voltage blocking and low-pressure speedup of the outlet directly correlate with the pulsed jet. This study shows the reasonable size design range of the self-excited oscillation nozzle, which can guide the design and practical application of the nozzle, as well as provide the theoretical basis for perfecting the selfexcited oscillation pulsed jet theory.

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“…Meanwhile, due to the existence of the collision boundary, the upstream of the shear layer is subjected to continuous unstable disturbance. The interaction between the collision wall of an angle of 90° and the jet minimal (Fang et al 2012).…”

Section: Physical Model and Mesh Generationmentioning

confidence: 99%

“…Kolsek et al (2007) studied the relationship between nozzle structure parameters and the frequency of oscillation through numerical simulation, and obtained the vortex structure and its evolution process in the cavity. Fang et al (2012) studied the influence of collision wall on self-resonating jet by numerical simulation. The result showed that all of collapse walls will influence the self-resonating waterjet, and the performance of self-resonating jet is optimal when the shape of the collision wall is same.…”

Section: Introductionmentioning

confidence: 99%

The Characteristics of Self-Resonating Jet Issuing from the Helmholtz Nozzle Combined with a Venturi Tube Structure

Miao

Kang

et al. 2020

JAFM

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Self-resonating waterjet is a new type of waterjet technology that has been widely used for many practical applications. In order to further improve the performance of self-resonating waterjet, the Helmholtz nozzle was improved by replacing the upper part of a traditional contract structure with a venture tube one. This composite nozzle of a venturi tube structure and a Helmholtz resonator was proposed based on the working mechanism of self-resonating waterjet nozzles and the instability of cavitation flow in venturi tubes. Furthermore, the results were also compared with those generated by a conventional Helmholtz nozzle under the same conditions. The frequency of the pressure pulsation in the oscillating cavity and at the outlet was obtained and analyzed by the classical Fast Fourier transform (FFT) method. The results showed that the main frequency of the pressure oscillation rises to 2362.78Hz, and the peak and average values of the pressure are increased by 45% and 12.5% respectively at the outlet of the composite nozzle. In the oscillating cavity of composite nozzle, the pressure oscillations in the central region have higher frequencies and amplitudes, while near the wall are reversed.

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The influence of collapse wall on self-excited oscillation pulsed jet nozzle performance

Cited by 6 publications

References 0 publications

Effects of the geometry of impinging surface on the pressure oscillations of self-resonating pulsed waterjet

Effects of the geometry of impinging surface on the pressure oscillations of self-resonating pulsed waterjet

Study on velocity and pressure characteristics of self-excited oscillating nozzle

The Characteristics of Self-Resonating Jet Issuing from the Helmholtz Nozzle Combined with a Venturi Tube Structure

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