Descripción del proyecto
Nuevas técnicas de imagen para lograr una caracterización precisa de los sistemas de pulverización
La dispersión de la luz durante la toma de imágenes provoca una borrosidad significativa en las fotografías registradas. Esto restringe la gama de aplicaciones y la precisión de los instrumentos ópticos modernos, como los diagnósticos láser para los sistemas de pulverización. En 2008, el investigador principal del proyecto en curso Spray-Imaging, financiado con fondos europeos, introdujo una técnica basada en la iluminación estructurada que elimina de forma eficaz los efectos de la dispersión múltiple de la luz. Partiendo de este avance, en el proyecto Spray-Imaging se pretende desarrollar y aplicar tres técnicas de imagen innovadoras para analizar exhaustivamente los sistemas de pulverización. Entre los principales objetivos del proyecto figuran la visualización de alto contraste y alta resolución de diversos fenómenos de pulverización no observados hasta ahora, la caracterización del campo de gotitas mediante un método de obtención de imágenes tridimensionales y el mapeo de la distribución de la temperatura en todo el sistema de pulverización.
Objetivo
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.
Ámbito científico
- engineering and technologyenvironmental engineeringenergy and fuelsliquid fuels
- natural sciencesphysical sciencesopticsmicroscopy
- engineering and technologymaterials engineeringcoating and films
- engineering and technologyindustrial biotechnologybiomaterialsbiofuels
- natural sciencesphysical sciencesopticslaser physics
Programa(s)
Régimen de financiación
ERC-STG - Starting GrantInstitución de acogida
22100 Lund
Suecia