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Open AccessArticle

The Evolution of Interfaces for Underwater Supersonic Gas Jets

1
School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
2
Xi’an Modern Control Technology Research Institute, Xi’an 710065, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 488; https://doi.org/10.3390/w12020488
Received: 10 January 2020 / Revised: 6 February 2020 / Accepted: 8 February 2020 / Published: 11 February 2020
(This article belongs to the Section Hydraulics and Hydrodynamics)
The evolution of interfaces for underwater gas jets is the main morphological manifestation of two-phase unstable interaction. The high-speed transient photographic recording and image post-processing methods are used to obtain the interfacial change in a submerged gaseous jet at different stages after its ejection from the Laval nozzle exit. The relationship between the pressure pulsation in the wake flow field and the interfacial change is further analyzed by combining the experimental results with computational results. A theoretical model is employed to address the competition dominant mechanism of interface instability. The results show that the jet interface of a supersonic gas jet gradually changes from one containing wave structures to a transition structure, and finally forms a steady-state conical jet. The fluctuation of the jet interface results in the pulsation of the back-pressure. The dominant mechanism of the interface changes with the development and distribution of the jet, from Kelvin-Helmholtz (K-H) instability beyond the nozzle exit changing to Rayleigh-Taylor (R-T) instability in the downstream. View Full-Text
Keywords: underwater gas jet; interface evolution; pressure oscillation; instability mechanism underwater gas jet; interface evolution; pressure oscillation; instability mechanism
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MDPI and ACS Style

Zhang, X.; Li, S.; Yu, D.; Yang, B.; Wang, N. The Evolution of Interfaces for Underwater Supersonic Gas Jets. Water 2020, 12, 488.

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