Image processing techniques for velocity, interface complexity, and droplet production measurement in the near-nozzle region of a diesel spray
Journal article, 2015

An ultrafast shadow imaging arrangement using a double-pulsed femtosecond laser system in concert with a frame transfer CCD was used to record time-correlated image-pairs in the near-nozzle region of a dissymmetric diesel jet issuing from a single-hole injector. A region-matching procedure was applied to produce velocity maps of the spray. The time-correlated image data were binarized and segmented to produce comparative data sets which isolate the jet core and the surrounding droplet cloud. The velocity mapping process was applied to these segmented data sets, a variable characterizing the degree of atomization of the jet was defined by means of statistical analysis, and the curvature scale space of the jet core edge was used to extract a measure of its complexity.

Spray characteristics

Single-hole injector

High-pressure injection


Imaging technique


K. Lounnaci

INSA Rouen

S. Idlahcen

INSA Rouen

David Sedarsky

Chalmers, Applied Mechanics, Combustion and Propulsion Systems

C. Rozé

INSA Rouen

J.B. Blaisot

INSA Rouen

F.X. Demoulin

INSA Rouen

Atomization and Sprays

1044-5110 (ISSN)

Vol. 25 9 753-775

Subject Categories

Mechanical Engineering

Areas of Advance





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