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Applied Sciences
Volume 15
Issue 23
10.3390/app152312558
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Article

Study on Oscillation Characteristics and Flow Field Effects in Submerged Pulsed Water Jet

by
Chao Feng
1,*,
Kunkun Li
2,3 and
Lingrong Kong
2,3
1
School of Resources and Environmental Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
2
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China
3
Resource Exploration Drilling Technology and Equipment Innovation Base of the Geological Society of China, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2025, 15(23), 12558; https://doi.org/10.3390/app152312558 (registering DOI)
Submission received: 31 October 2025 / Revised: 19 November 2025 / Accepted: 25 November 2025 / Published: 26 November 2025
Versions Notes

Abstract

The self-excited oscillation pulsed waterjet (SOPW) offers simplicity and effective pressure source separation, making it widely utilized. This study investigates the oscillation characteristics and flow field effects of SOPW generated by a Helmholtz nozzle. A transfer function model for the nozzle is established, and the natural frequency is found to correlate with structural parameters such as the oscillation chamber’s cross-sectional area, length, and downstream nozzle diameter. Numerical simulations reveal optimal structural parameters that closely match experimental results, with errors under 15%. Notably, submerged pulsed jets exhibit faster velocity decay compared to non-submerged jets. Additionally, the study examines the effect of area discontinuity at the nozzle inlet on axial velocity, showing that the area enlargement or contraction enhances velocity at lower pressures but inhibits it at higher pressures. This work advances the understanding of nozzle design and the flow field behavior of SOPW.
Keywords: self-excited oscillation pulsed waterjet; area discontinuity; flow field; natural frequency; Helmholtz nozzle self-excited oscillation pulsed waterjet; area discontinuity; flow field; natural frequency; Helmholtz nozzle

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MDPI and ACS Style

Feng, C.; Li, K.; Kong, L. Study on Oscillation Characteristics and Flow Field Effects in Submerged Pulsed Water Jet. Appl. Sci. 2025, 15, 12558. https://doi.org/10.3390/app152312558

AMA Style

Feng C, Li K, Kong L. Study on Oscillation Characteristics and Flow Field Effects in Submerged Pulsed Water Jet. Applied Sciences. 2025; 15(23):12558. https://doi.org/10.3390/app152312558

Chicago/Turabian Style

Feng, Chao, Kunkun Li, and Lingrong Kong. 2025. "Study on Oscillation Characteristics and Flow Field Effects in Submerged Pulsed Water Jet" Applied Sciences 15, no. 23: 12558. https://doi.org/10.3390/app152312558

APA Style

Feng, C., Li, K., & Kong, L. (2025). Study on Oscillation Characteristics and Flow Field Effects in Submerged Pulsed Water Jet. Applied Sciences, 15(23), 12558. https://doi.org/10.3390/app152312558

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