Detailed numerical simulations of primary atomization of airblasted liquid sheet

Mukundan, Anirudh Asuri; Ménard, Thibaut; Motta, Jorge César Brändle de; Berlemont, Alain

doi:10.1016/j.ijmultiphaseflow.2021.103848

Cited by 6 publications

(2 citation statements)

References 50 publications

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“…However, the changes in small-scale vortices with time cannot be studied in depth. Direct numerical simulation (DNS) was gradually accepted in the study of liquid jets, but grid and time scales were unacceptable in industry computation [14,15]. Compared with different turbulence models, the prediction result of the pressure and reaction process using the LES model was found to be closer to the experimental results [16].…”

Section: Introductionmentioning

confidence: 97%

Effect of the Curvature Radius on Single-Droplet Dynamic Characteristics within a Concave-Wall Jet

Gong,

Jian,

Zhang

et al. 2024

Processes

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The centrifugal force field in a hydrocyclone was affected by the concave-wall curvature radius R0, and the mechanism underlying droplet deformation was closely related to the mass transfer efficiency. Numerical simulation and experimental data were collected to reveal the deformation characteristics and mechanism of a single droplet crossing concave-wall jet. Normalized interfacial energy γ and stretching performance were provided to investigate the droplet deformation process. The results showed that the droplet was stretched along the streamwise direction and shrank along the spanwise direction in the concave-wall jet. The droplet interfacial energy and deformation were the largest when the droplet crossed the jet boundary at t = 0.20 s. The maximum γ value increased with the increase in R0 by 57.3% to 71.4%, and the distance between the droplet and concave wall increased with R0. The Q-criterion was exported to show the increase in the vortex strength with the decrease in R0 at the jet boundary. The pressure distribution inside the droplet showed that the pressure decreased as R0 increased, while the pressure difference increased along the streamwise and wall-normal directions. This study suggested that the droplet breakup was more difficult for a smaller R0, which was beneficial for liquid–liquid heterogeneous separation.

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Section: Introductionmentioning

confidence: 97%

Effect of the Curvature Radius on Single-Droplet Dynamic Characteristics within a Concave-Wall Jet

Gong,

Jian,

Zhang

et al. 2024

Processes

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show abstract

“…The material interface is tracked by the Front-Tracking methods [11][12][13] or captured using methods such as the Volume-Of-Fluid (VOF) method [14], or the Level-Set method [15]. These approaches are able to finely predict the evolution of the interface topology and its primary breakup [16][17][18][19]. However they require significant mesh resolution in the interface vicinity [20] which makes them unsuitable for prediction in complex industrial systems.…”

Section: Introductionmentioning

confidence: 99%

Numerical assessment of Diffuse-Interface method for air-assisted liquid sheet simulation

Péden,

Carmona,

Boivin

et al. 2023

Computers & Fluids

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A Numerical Study of Aero Engine Sub-idle Operation: From a Realistic Representation of Spray Injection to Detailed Chemistry LES-CMC

Okraschevski

Mesquita

Koch

et al. 2023

Flow Turbulence Combust

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High altitude relight is a matter of increasing importance for aero engine manufacturers, in which combustion plays literally a vital role. In this paper we want to evaluate the predictive capability of a combined Smoothed Particle Hydrodynamics (SPH) and Large Eddy Simulation with Conditional Moment Closure (LES-CMC) approach for a spray combustion process at these extreme conditions. The focus is on the SPH modelling of the kerosene primary atomization, the extraction of realistic spray boundary conditions for LES-CMC and the effect of the spray on combustion. Interestingly, it will be demonstrated that the fragment size distributions resulting from the airblast atomization are characterized by bimodal behaviour during the relight process and that small and large fragments differ significantly in their dynamical behavior. This is shown to affect the combustion in the Central Recirculation Zone (CRZ). Very large fragments are even able to supersede the flame from the CRZ, such that endothermic pyrolysis becomes dominant, but simultaneously essential to sustain and stabilize the remaining flame with reactive pyrolysis species. The study proves the ability of our methodology for extreme operating conditions, in which experimental insights are hardly possible.

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Detailed numerical simulations of primary atomization of airblasted liquid sheet

Cited by 6 publications

References 50 publications

Effect of the Curvature Radius on Single-Droplet Dynamic Characteristics within a Concave-Wall Jet

Effect of the Curvature Radius on Single-Droplet Dynamic Characteristics within a Concave-Wall Jet

Numerical assessment of Diffuse-Interface method for air-assisted liquid sheet simulation

A Numerical Study of Aero Engine Sub-idle Operation: From a Realistic Representation of Spray Injection to Detailed Chemistry LES-CMC

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