Droplet spatial distribution in a spray under evaporating and reacting conditions
| Autor: | Olivier Rouzaud, Lola Rousseau, Mikael Orain, Olivier Simonin, Christine Lempereur |
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| Přispěvatelé: | Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut de Mécanique des Fluides de Toulouse - IMFT (Toulouse, France), ONERA - The French Aerospace Lab [Toulouse], ONERA, Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Mie scattering Mécanique des fluides Computational Mechanics General Physics and Astronomy 02 engineering and technology Combustion Spatial distribution 01 natural sciences Droplet flows 010305 fluids & plasmas Regular grid [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] Physics::Fluid Dynamics 020401 chemical engineering 0103 physical sciences Two-phase combustion 0204 chemical engineering Fluid Flow and Transfer Processes Number density [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment Mechanics Flow conditions Mechanics of Materials Affine transformation Combustion chamber |
| Zdroj: | Experiments in Fluids Experiments in Fluids, Springer Verlag (Germany), 2021, 62 (2), pp.26. ⟨10.1007/s00348-020-03129-9⟩ |
| ISSN: | 0723-4864 1432-1114 |
| DOI: | 10.1007/s00348-020-03129-9⟩ |
| Popis: | International audience; In order to study spray combustion, an experimental test rig was developed at ONERA to partially characterize the flow conditions inside the combustion chamber of a gas turbine. Experimental campaigns using laser-based diagnostics were performed to provide an experimental database under reacting and non-reacting conditions. The paper first describes the Mie scattering image-processing to detect the droplets in the spray, and to calculate 2D maps of droplet number density and mean inter-droplet distance. The method is subsequently used to investigate the spray behavior under both reacting and non-reacting conditions according to global-averaging and phase-averaging methods. Experimental findings on the spatial droplet distribution in the spray are compared to the simple regular grid distribution and the Hertz-Chandrasekhar distribution. Results show that, under both conditions, there is an affine relationship between the inverse square root of the mean droplet number density and the nearest-neighbor inter-droplet distance. Moreover, observations suggest that the droplet spatial distribution fits more closely to a Hertz-Chandrasekhar distribution than a simple regular grid distribution, which may bring new insight for spray modeling. |
| Databáze: | OpenAIRE |
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