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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimir: 1065-3090
ISSN En Línea: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v9.i1.40
19 pages

UNUSUAL LASER-SHEET TOMOGRAPHY COUPLED WITH BACKLIGHT IMAGING CONFIGURATIONS TO STUDY THE DIESEL JET STRUCTURE AT THE NOZZLE OUTLET FOR HIGH INJECTION PRESSURES

Jérôme Yon
Normandie Univ, INSA Rouen, UNIROUEN, CNRS, CORIA, 76000 Rouen, France
Jean-Bernard Blaisot
University of Rouen
M. Ledoux
CORIA-UMR CNRS 6614, Universite de Rouen, Site du Madrillet Avenue de l’Universite, BP12 76801 Saint Etienne du Rouvray cedex, France

SINOPSIS

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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