Sacomano,Fernando

Motivation

From the combustion processes encountered in the majority of practical devices turbulent spray flames stand out. Turbulent flames and even turbulent flows are frequently preferred in practical applications since the process of mixing is intensified. In reactive flows, specifically in combustion, improving the mixture of fuel and oxidants leads to a greater reaction rate, which results in an increase in the device’s specific power. In its turn, high specific powers are interesting in commercial equipments by allowing designs of compact devices, which reduces its production costs.

While high specific powers are reached with flames in the turbulent state, the usage of spray flames offers an advantage on the flame control and the reduction of pollutant emission. The atomization of the liquid fuel provides control over the fuel distribution into the reaction zone. This characteristic is one of the key points on the stratified charge combustion offered by the direct injection engines. The cooling of the mixture in the flame zone, originated by droplets evaporation, reduces the emission of the NOx. Regarding these phenomena, inherent to turbulent spray combustion, the trend in using numerical modeling tools to address this issue is strongly growing.

An overall modelling considering the accounting of the underlying phenomena to the spray flame is indispensable not only to predict the spray behavior itself but also to provide a computational tool able to complement experimental measurements giving support to engineering/industrial design tasks. The complementation of experimental investigations is something that stands out in the combustion process optimization, since it is not possible to gain all the flame information through experimental measurements only.

Looking for the contribution to achieve more understanding on turbulent spray combustion this PhD work aims to develop an accurate computational tool that enables to simulate and numerically analyze instabilities in this combustion process relying on comprehensive experimental data.

Methodology

Instantaneous plot of carrier phase temperature. Órleans spray flame configuration.
Instantaneous plot of carrier phase temperature. Órleans spray flame configuration.

The recent works developed in this research area show that the Large Eddy Simulation (LES) of the turbulent carrier phase is able to capture the unsteady behavior of the spray phenomena. It is also shown that the Sub-Grid Scale fluctuations (SGS) on velocity fields considerably interfere droplets dispersion. For that reason, these work aims to model the turbulence and the effects of it on droplets behavior using LES and SGS fluctuations.

he spray modelling will follow the Eulerian-Lagrangian approach, where the carrier phase is computed using an Eulerian fluid flow representation while the droplets are tracked in a Lagrangian framework. The phase changing phenomena will be captured with advanced evaporation models, insuring accurate computation of the phase transition in high temperatures atmosphere.

In the last years good results were achieved in the tabulated chemistry approach to predict reactive flows. Some research works shown good competence of the Flamelet Generated Manifold (FGM) to capture the combustion behavior in different flame regimes. the For that reason, the Flamelet Generated Manifold (FGM) procedure will be used to compute and the provide the chemistry data to the flow field. A non-adiabatic procedure will be developed to account the evaporative cooling effect on reactions.

Publications

Sacomano Filho, F. L. ; Krieger Filho, G. C. ; van Oijen, J. A. ; Sadiki, A. ; Janicka, J. (2019):
A novel strategy to accurately represent the carrier gas properties of droplets evaporating in a combustion environment.
In: International Journal of Heat and Mass Transfer, S. 1141-1153, (137), ISSN 0017-9310,
DOI: 10.1016/j.ijheatmasstransfer.2019.03.164,
[Online-Edition: http://www.sciencedirect.com/science/article/pii/S0017931018...],
[Article]

Sacomano Filho, F. L. ; Kadavelil, J. ; Staufer, M. ; Sadiki, A. ; Janicka, J. (2019):
Analysis of LES-based combustion models applied to an acetone turbulent spray flame.
In: Combustion Science and Technology, Taylor & Francis Inc, S. 54-67, 191, (1), ISSN 0010-2202,
DOI: 10.1080/00102202.2018.1452404,
[Article]

Sacomano Filho, Fernando Luiz ; Speelman, Nico ; van Oijen, Jeroen Adrianus ; de Goey, Laurentius Philippus Hendrika ; Sadiki, Amsini ; Janicka, J. (2018):
Numerical analyses of laminar flames propagating in droplet mists using detailed and tabulated chemistry.
In: Combustion Theory and Modelling, S. 998-1032, 22, (5), ISSN 1364-7830,
DOI: 10.1080/13647830.2018.1470332,
[Online-Edition: https://doi.org/10.1080/13647830.2018.1470332],
[Article]

Sacomano Filho, F. L. ; Chrigui, M. ; Sadiki, A. ; Janicka, J. (2014):
Les-Based Numerical Analysis of Droplet Vaporization Process in Lean Partially Premixed Turbulent Spray Flames.
In: Combustion Science and Technology, S. 435-452, 186, (4-5), ISSN 0010-2202,
[Online-Edition: http://dx.doi.org/10.1080/00102202.2014.883207],
[Article]

Chrigui, M. ; Sacomano Filho, F. L. ; Sadiki, A. ; Masri, A.
Merci, B. ; Gutheil, E. (Hrsg.) (2014):
Evaporation Modeling for Polydisperse Spray in Turbulent Flow.
In: Experiments and Numerical Simulations of Turbulent Combustion of Diluted Sprays: TCS 3: Third International Workshop on Turbulent Spray Combustion, S. 55-77, [Online-Edition: http://dx.doi.org/10.1007/978-3-319-04678-5_3],
[Book section]

Sacomano Filho, F. L. ; Chrigui, M. ; Sadiki, A. ; Janicka, J. (2014):
LES of a partially premixed spray flame using an adaptative-dynamic ATF model coupled to FGM.
In: 35th International Symposium on Combustion, San Francisco, USA, [Konferenzveröffentlichung]

Sadiki, A. ; Chrigui, M. ; Sacomano Filho, F. L. ; Masri, A.
Merci, B. ; Gutheil, E. (Hrsg.) (2014):
Large Eddy Simulation of Diluted Turbulent Spray Combustion Based on FGM Methodology: Effect of fuel and Mass Loading.
In: Experiments and Numerical Simulations of Turbulent Combustion of Diluted Sprays: TCS 3: Third International Workshop on Turbulent Spray Combustion, S. 107-128, [Online-Edition: http://dx.doi.org/10.1007/978-3-319-04678-5_5],
[Book section]

Gumprich, Werner ; Sacomano Filho, F. L. ; Chrigui, M. ; Sadiki, A. (2013):
Simulation of Evaporating Polydisperse Sprays using the Direct Quadrature based Sectional Method of Moments and a Realistic Evaporation Model.
In: International Conference on Multiphase Flow, Jeju, South Korea, [Konferenzveröffentlichung]

Sacomano Filho, F. L. ; Chrigui, M. ; Chauveau, C. ; Gökalp, I. ; Sadiki, A. ; Janicka, J. (2013):
Large Eddy Simulation of n-Heptane Partially Pre-Vaporized Turbulent Spray Flame using FGM.
In: European Combustion Meeting, Lund, Sweden, [Konferenzveröffentlichung]

Sacomano Filho, F. L. ; Chrigui, M. ; Sadiki, A. ; Janicka, J. (2013):
Eulerian-Lagrangian Simulations of n-Heptane Spray Combustion using LES and FGM.
In: International Conference on Multiphase Flow, Jeju, South Korea, [Konferenzveröffentlichung]

Sacomano Filho, F. L. ; Chrigui, M. ; Sadiki, A. ; Janicka, J. (2013):
LES based numerical analysis of droplet vaporization process in lean partially premixed turbulent spray flames.
In: 8th Mediterranean Combustion Symposium (MCS-13), Izmir, Turkey, [Konferenzveröffentlichung]

Sacomano Filho, F. L. ; Chrigui, M. ; Sadiki, A. ; Janicka, J. (2013):
Large Eddy Simulations of a Lean Partially Pre-Vaporised Spray Flame using Non-Premixed and Premixed Manifolds.
In: 4th International Workshop on turbulent Spray Combustion (TCS 4), Izmir, Turkey, [Konferenzveröffentlichung]

Sacomano Filho, F. L. ; Chrigui, M. ; Sadiki, A. ; Janicka, J. (2013):
Large Eddy Simulations of diluted spray flames performed with FASTEST3D coupled with LAG3D.
In: 4th FASTEST Workshop, Darmstadt, Germany, [Konferenzveröffentlichung]

Sacomano Filho, F. L. ; Chrigui, M. ; Sadiki, A. ; Janicka, J. (2013):
Numerical Analysis of a Partially Pre-Vaporized Turbulent Spray Flame using LES and FGM.
In: 25th European Conference Liquid Atomization & Spray Systems (ILASS 2013), Chania, Greece, [Konferenzveröffentlichung]

Chrigui, M. ; Sacomano Filho, F. L. ; Masri, A. ; Sadiki, A. ; Janicka, J. (2012):
Evaporation of Polydisperse Acetone Spray Using LES-based Eulerian-Lagrangian Approach.
In: 3rd International Workshop on turbulent Spray Combustion (TCS3), Heidelberg, Germany, [Konferenzveröffentlichung]

Sacomano Filho, F. L. ; Chrigui, M. ; Sadiki, A. ; Janicka, J. (2012):
Numerical Analysis of an n-Heptane Partially Premixed Spray Flame using LES and FGM Tabulated Chemistry.
In: 3rd International Workshop on turbulent Spray Combustion (TCS3), Heidelberg, Germany, [Konferenzveröffentlichung]

Sacomano Filho, F. L. ; Krieger Filho, B. C. ; Sadiki, A. (2012):
Numerical Investigation of an Ethanol Turbulent Spray Flame in URANS Context.
In: 13th Workshop on Two-Phase Flow Predictions, Halle (Saale), Germany, [Konferenzveröffentlichung]

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