Journal of Flow Visualization and Image Processing

ISSN for PRINT: 1065-3090

For Online Access

Best Paper Award Selection - Editorial Board Site

2002, Volume9

Issue 1

96 pages

Issue price - $140.00

J. Yon
CORIA-UMR CNRS 6614, Universite de Rouen, Site du Madrillet Avenue de l’Universite, BP12 76801 Saint Etienne du Rouvray cedex, France

J.-B. Blaisot
CORIA-UMR CNRS 6614, Universite de Rouen, Site du Madrillet Avenue de l’Universite, BP12 76801 Saint Etienne du Rouvray cedex, France

M. Ledoux
CORIA-UMR CNRS 6614, Universite de Rouen, Site du Madrillet Avenue de l’Universite, BP12 76801 Saint Etienne du Rouvray cedex, France

One of the main goals of the car manufacturer is to build less polluting Diesel engines. In order to control the combustion it is essential to understand the atomization process. It is well known that the behavior of the liquid jet at the nozzle outlet acts directly on the atomization. For high injection pressures, the density of the jet at the injector exit makes it very difficult to study. Among the several technical approaches often used to visualize this dense region of the jet, the most convincing one seems to be laser-light sheet tomography. In this paper, the tomography is used together with short duration non-coherent backlighting. The focal plane displacement effect on the imaging and the modification of the laserlight sheet orientation are the main originalities of this work. These optical configurations have been applied to a 200-mm hole diameter nozzle for injection pressure up to 80 MPa. The changes in the jet structure with different injection pressures and at different injection times are reported. External and internal structures of the jet are pointed out. The visualizations, linked to a ray-tracing simulation, allowed us to design a new model for the Diesel jet structure.

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