Description du projet
De nouvelles techniques d’imagerie pour une caractérisation précise des systèmes de pulvérisation
La dispersion de la lumière pendant le processus d’imagerie crée un flou important sur les photographies enregistrées, ce qui limite le nombre d’applications, telles que les diagnostics laser pour les systèmes de pulvérisation, ainsi que la précision des instruments optiques modernes. En 2008, le chercheur principal de l’actuel projet Spray-Imaging, financé par l’UE, a introduit une technique basée sur l’illumination structurée qui supprime efficacement les effets de la diffusion multiple de la lumière. S’appuyant sur cette avancée, le projet Spray-Imaging entend développer et mettre en œuvre trois techniques d’imagerie innovantes qui permettront d’analyser les systèmes de pulvérisation de façon approfondie. Les principaux objectifs du projet comprennent l’obtention d’une visualisation à contraste élevé et à haute résolution de divers phénomènes de pulvérisation encore non observés jusqu’à présent, la caractérisation du champ de gouttelettes à l’aide d’une méthode d’imagerie tridimensionnelle et la cartographie de la distribution de la température dans l’ensemble du système de pulvérisation.
Objectif
The multiple scattering of light is a complex phenomenon, commonly encountered but rarely desired. In imaging it induces strong blurring on the recorded photographs, limiting the range of applicability and accuracy of modern optical instruments. A typical example concerns the laser diagnostics of spray systems. The PI has revealed in 2008 a technique based on structured illumination with the important capability to remove the contributions from multiple light scattering, allowing the unique possibility of visualising through dense sprays. Based on this acquired knowledge, the aim of this proposal is to develop and apply three novel imaging techniques for the complete characterizations of spray systems:
The first technique will focus on visualizing with both high contrast and high resolution various spray phenomena that have not been observed in the past; such as complex spray breakup mechanisms in the near-nozzle region.
The second technique is related to the characterization of the formed droplets field. This concerns the accurate measurement of both droplets size and concentration using a three-dimensional imaging approach.
Finally, a third important task is the mapping of the spray temperature over the whole spray system. This information would lead to the determination of heat transfer and evaporation rate, which are key factors in the performance of combustion devices.
By extracting these important quantities - dynamics, droplets size/concentration and thermometry - fundamental insights which are still missing to fully understand the process of atomization will be provided. This will also serve at validating modern CFD models, leading to reliable predictions of spray behaviours. Even though this work can directly benefit to a large number of medical and industrial spray applications, it will mostly focus on fuel spray injections used in combustion devices.
Champ scientifique
- engineering and technologyenvironmental engineeringenergy and fuelsliquid fuels
- natural sciencesphysical sciencesopticsmicroscopy
- engineering and technologymaterials engineeringcoating and films
- engineering and technologyindustrial biotechnologybiomaterialsbiofuels
- natural sciencesphysical sciencesopticslaser physics
Programme(s)
Thème(s)
Régime de financement
ERC-STG - Starting GrantInstitution d’accueil
22100 Lund
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