An Investigation of Compressible Gas Jets Submerged Into Water

Fronzeo, Melissa; Kinzel, Michael P.

doi:10.2514/6.2016-4253

Cited by 15 publications

(5 citation statements)

References 8 publications

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“…All of the simulations were modeled using the commercial CFD (Computational Fluid Dynamics) code, ANSYS-Fluent. The VOF multi-phase model is used to track the change of gas-liquid interface, and this model has been validated in getting the fraction of gas in underwater gaseous jets [10,15,19]. The two-dimensional axisymmetric geometric model with the same size of water vessel is established for simulation, and the pressure-velocity coupling SIMPLE algorithm is used to solve the discrete equations.…”

Section: Methodsmentioning

confidence: 99%

“…Zhang et al [18] observed the development of jet shear vortex under water flow conditions through water tunnel tests, and found that larger vortices are formed when the main body of the jet evolves downstream and mixes with the jet shear layer. Fronzeo et al [19] divided the jet stabilizing structures based on simulation results, and separated it into a non-viscous core area, a mixing area, an intermittent bubbly area, and the unstable jet wake. The central non-viscous core region shows large momentum characteristics.…”

Section: Introductionmentioning

confidence: 99%

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The Evolution of Interfaces for Underwater Supersonic Gas Jets

Zhang

et al. 2020

Water

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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.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Evolution of Interfaces for Underwater Supersonic Gas Jets

Zhang

et al. 2020

Water

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“…Most of the numerical simulations use two-dimensional axisymmetric assumptions, the research content covering the thrust characteristics of the engine [8][9][10][11], the structure of the jet wave system [12], the development of the gas-liquid interface [9,11,[13][14][15], and the jet instability [14][15][16], which provides a theoretical basis for the flow process of underwater high-speed jets. Considering that a two-dimensional axisymmetric jet cannot precisely capture the influence of three-dimensional fluid motion on the air-liquid interface, Fronzeo et al [17] used the delayed detached eddy simulation (DDES) turbulence model to study the effect of different environmental densities on a supersonic jet. They found that the turbulence intensity at the air-liquid interface increased considerably with an increase in fluid density, resulting in poorer jet stability.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Simulation of the Underwater Supersonic Gas Jet Evolution and Its Induced Noise

Wang

Zhang

2023

Applied Sciences

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To explore the complex flow field and noise characteristics of underwater high-speed gas jets, the mixture multiphase model, large eddy simulation method, and Ffowcs Williams–Hawking (FW–H) acoustic model were used for simulations, and the numerical methods were validated by the gas jet noise experimental results. The results revealed that during the initial stages, the jet collided with the water surface and created low-pressure high-temperature gas bubbles, accompanied by much high-frequency noise. When the jet reached its maximum length, its impact weakened, the bubble broke, the jet transformed into a conical shape, and the jet noise changed from high- to low-frequency. The pressure fluctuation peaked near the position at which the Mach number reached 1, indicating that the jet was the most unstable at the sonic point. Additionally, at low frequencies, the sound pressure levels between jets with different nozzle pressure ratios were similar, whereas above 400 Hz, under-expanded jets had higher sound pressure levels. This paper provides theoretical guidance for the study of underwater jet noise.

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“…e frequency also increases with the liquid density [27]. Xue et al established a three-dimensional mathematical model based on the experiments to explore the expansion characteristics of combustion gas jet in liquid.…”

Section: Introductionmentioning

confidence: 99%

Main Characteristics of Underwater Supersonic Gas Jet Flows

Nan

Chen

Wang

2022

Mathematical Problems in Engineering

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Underwater supersonic gas jet flows are sophisticated physical phenomena that widely exist in underwater propulsion, such as underwater rocket, high-speed torpedo, and water-piercing missile launcher (WPML). The present study aims to explore the characteristics of underwater supersonic jets. This research carries out two-dimensional and three-dimensional underwater jet experiments and establishes an improved spherical bubble model to study the transient and steady-state characteristics of the underwater supersonic jet. The simulation results show that the entrainment strength and anti-interference ability are the main factors affecting the transient characteristics of underwater supersonic jets. The experimental results show that the jet angle increases with increasing pressure and the increased rate of the jet angle decreases with increasing pressure. The jet pulsation exists in the entire experimental pressure range from 0.4 MPa to 6.5 MPa. The frequency of back-attack increases first and then decreases with increasing pressure in the chamber. The frequency peak appears at 0.8 MPa, which is 5.96 Hz.

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An Investigation of Compressible Gas Jets Submerged Into Water

Cited by 15 publications

References 8 publications

The Evolution of Interfaces for Underwater Supersonic Gas Jets

The Evolution of Interfaces for Underwater Supersonic Gas Jets

A Numerical Simulation of the Underwater Supersonic Gas Jet Evolution and Its Induced Noise

Main Characteristics of Underwater Supersonic Gas Jet Flows

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