Characterizing spray flame–vortex interaction: A spray spectral diagram for extinction

Franzelli, Benedetta; Vié, Aymeric; Ihme, Matthias

doi:10.1016/j.combustflame.2015.09.006

Cited by 13 publications

(7 citation statements)

References 33 publications

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“…A 24-species mechanism developed to perform DNS of n-dodecane spray flames [11,16] is considered here. It consists of an analytical reconstruction of the species chemical production ratesω k from the detailed JetSurF 1.0 mechanism [17], originally consisting of 123 species and 977 reactions.…”

Section: Multi-species Chemistrymentioning

confidence: 99%

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Large Eddy Simulation of Swirled Spray Flame Using Detailed and Tabulated Chemical Descriptions

Franzelli

Vié

Boileau

et al. 2016

Flow Turbulence Combust

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Accurate characterization of swirled flames is a key point in the development of more efficient and safer aeronautical engines. The task is even more challenging for spray injection systems. From one side, spray interacts with both turbulence and flame, eventually affecting the flame dynamics. On the other side, the structure of turbulent spray flame is highly complex due to equivalence ratio inhomogeneities caused by evaporation and mixing processes. The first objective of this work is to numerically characterize the structure and dynamics of a swirled spray flame. The target configuration is the experimental benchmark named MERCATO, representative of an actual turbojet injection system. Due to the complex nature of the flame, a detailed description of chemical kinetics is necessary and is here obtained by using a 24-species chemical scheme, which has been expressly developed for DNS of spray flames. The first LES of a swirled spray flame using such a detailed chemical description is performed here and results are analyzed to study the complex interactions between the spray, the turbulent flow and the flame. It is observed that this coupling has an effect on the flame structure and that flame dynamics are governed by the interactions between spray, precessing vortex core and flame front. Even if such a detailed kinetic description leads to an accurate characterization of the flame, it is still highly expensive in terms of CPU time. Tabulated techniques have been expressly developed to account for detailed chemistry at a reduced computational cost in purely gaseous configurations. The second objective is then to verify the capability of the FPI tabulated chemistry method to correctly reproduce the spray flame characteristics by performing LES. To do this, results with the FPI method are compared to the experimental database and to the results obtained with the 24-species description in terms of mean and fluctuating axial gas velocity and liquid phase characteristics (droplet diameter and liquid velocity). Moreover, the flame characterization obtained with the FPI approach is compared to the results of the 24-species scheme focusing on the flame structure, on major and minor species concentrations as well as on pollutant emissions. The potential and the limits of the tabulated approach for spray flame are finally assessed.

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Section: Multi-species Chemistrymentioning

confidence: 99%

“…Even if the droplet evaporation is then altered close to the flame front, such strategy preserves the Lefebvre number of the flame, i.e. the ratio between the evaporation time and the chemical time, which is a key parameter for the characterization of spray flames [16].…”

Section: Gas Phase Descriptionmentioning

confidence: 99%

Large Eddy Simulation of Swirled Spray Flame Using Detailed and Tabulated Chemical Descriptions

Franzelli

Vié

Boileau

et al. 2016

Flow Turbulence Combust

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show abstract

“…Computations of general two-phase reacting flows with detailed description of the chemistry have been receiving more attention along the last years [6,[8][9][10][11][12]. Regarding the evaluation of tabulated chemistry strategies, Olguin and Gutheil [10] and Franzelli et al [9] exclusively analyzed laminar flames, while Vié et al [8] and Franzelli et al [6] also considered turbulent flows.…”

Section: Introductionmentioning

confidence: 99%

Numerical analyses of laminar flames propagating in droplet mists using detailed and tabulated chemistry

Filho

Speelman

Oijen

et al. 2018

Combustion Theory and Modelling

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“…Herein, the consideration of heat losses is not trivial and typically involves high computational efforts [11][12][13]. Commonly, the low volume fraction of diluted sprays are used to justify simulations without heat losses [14,15]. Nevertheless, as analyzed in [16] for one-dimensional flames propagating in droplet mists, the inclusion of the evaporative cooling is quite relevant in the spray combustion modeling.…”

Section: Introductionmentioning

confidence: 99%

Investigations of Evaporative Cooling and Turbulence Flame Interaction Modeling in Ethanol Turbulent Spray Combustion Using Tabulated Chemistry

Filho

Dreßler

Hosseinzadeh

et al. 2019

Fluids

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Evaporative cooling effects and turbulence flame interaction are analyzed in the large eddy simulation (LES) context for an ethanol turbulent spray flame. Investigations are conducted with the artificially thickened flame (ATF) approach coupled with an extension of the mixture adaptive thickening procedure to account for variations of enthalpy. Droplets are tracked in a Euler–Lagrangian framework, in which an evaporation model accounting for the inter-phase non-equilibrium is applied. The chemistry is tabulated following the flamelet generated manifold (FGM) method. Enthalpy variations are incorporated in the resulting FGM database in a universal fashion, which is not limited to the heat losses caused by evaporative cooling effects. The relevance of the evaporative cooling is evaluated with a typically applied setting for a flame surface wrinkling model. Using one of the resulting cases from the evaporative cooling analysis as a reference, the importance of the flame wrinkling modeling is studied. Besides its novelty, the completeness of the proposed modeling strategy allows a significant contribution to the understanding of the most relevant phenomena for the turbulent spray combustion modeling.

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Characterizing spray flame–vortex interaction: A spray spectral diagram for extinction

Cited by 13 publications

References 33 publications

Large Eddy Simulation of Swirled Spray Flame Using Detailed and Tabulated Chemical Descriptions

Large Eddy Simulation of Swirled Spray Flame Using Detailed and Tabulated Chemical Descriptions

Numerical analyses of laminar flames propagating in droplet mists using detailed and tabulated chemistry

Investigations of Evaporative Cooling and Turbulence Flame Interaction Modeling in Ethanol Turbulent Spray Combustion Using Tabulated Chemistry

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