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Etude et réalisation d'un système automatique de caractérisation de jets diesel en champ proche et lointain

Abstract : Car market is growing in Europe and it is mostly the same in the world. However, to respect the pollution directive, efforts have to be done to improve motorisation. The improvement of the air-fuel mixture quality in the aim to decrease the pollutant emission and the consumption can be done by a better understanding of the spray formation. The spray evolution is characterised by its morphological parameters such as tip penetration, cone angle, volume... During this thesis, an automatic optical test bench has been developed to understand the spray formation. The test bench is made of : - a hardware part made by a back pressure chamber (to simulate the cold engine), a light source, a camera associated with a flow meter. – a software part made by acquisition and image processing software. Spray injection is a fast phenomenon, in this aim we have to use an intensified camera. A driving and image processing software allow to acquire and process all images needed for the spray study. After a study of the different methods of image segmentation, based on speed, simplicity, absence of setting parameters, we have choose to work with an algorithm based on an automatic thresholding image algorithm. Results can be classified from two points of view. – Macroscopic point of view : the setup computes automatically the spray tip penetration, cone angle, and volume of each plume, the average and standard deviation time evolution for the different parameters. We have study and compared different types of injectors for different injection pressure and back pressure. A new tip penetration law for high pressure Diesel injectors (modification of Hiroyasu law)has been exposed as well as an evolution of the richness of the air fuel mixture based on the volume of each spray measured on images. – Microscopic point of view : we had made observations that confirm those from literature such as primary break up. We have initiated new observation method based on digital holographic measurement which has performed interesting results.
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Submitted on : Monday, April 27, 2009 - 10:36:53 AM
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  • HAL Id : tel-00378818, version 1

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Jérôme Seneschal. Etude et réalisation d'un système automatique de caractérisation de jets diesel en champ proche et lointain. Traitement du signal et de l'image [eess.SP]. Université Jean Monnet - Saint-Etienne, 2005. Français. ⟨tel-00378818⟩

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