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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Печать: 2152-5102
ISSN Онлайн: 2152-5110

Выпуски:
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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v24.i4-6.400
pages 851-860

Time-Resolved Diffraction Granulometer for Measurements in Transient Sprays

D. Lisiecki
UMR 6614/CORIA, UNIVERSITE DE ROUEN, 76821 Mont Saint Aignan 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

Краткое описание

The study of sprays of droplets issuing from cars injectors requires fast diagnostics synchronized on very short jet appearance. Particle sizer must furthermore be able to measure very small drops in high pressure chambers with restricted access. An instrument with capability for measuring droplet size by Fraunhofer diffraction technique with high frequency acquisition was developed. The temporal variation of the size distribution within a single diesel injection may be now recorded. An inversion program involves a generalized Lorenz Mie theory, developed in the laboratory. With this program, the scattered light of a droplet in a gaussian laser beam can be calculated. The effect of illumination profile (i.e.: ratio of the laser beam diameter on drop size) on the scattered light distribution is evaluated; the smallest beam size for a higher spatial resolution with no bias on measurement may then be calculated.
By use of a standard Malvern detector, measurements of droplet size larger than one micrometer are performed in a pressurized chamber with thick windows. Under the present configuration a special lens with short focus length and large diameter is used. An example of application to a Diesel spray is showed.


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