Atomization and Sprays Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

For Online Access

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2001, Volume11

Issue 4

186 pages

Issue price - $75.00

Yong Yue
Argonne National Laboratory, Argonne, Illinois, USA

Christopher F. Powell
Center for Transportation Research, Argonne National Laboratory, Argonne, Illinois 60439-4815, USA

Ramesh Poola
Argonne National Laboratory, Argonne, Illinois, USA

Jin Wang
Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439-4815, USA

Johannes K. Schaller
Robert Bosch GmbH, Stuttgart, Germany

The mass distribution of diesel fuel sprays close to the nozzle has been determined by using absorption techniques with a monochromatic, synchrotron X-ray beam. The measurements were highly quantitative, with a temporal resolution better than 1 ms. The radial mass distribution of the fuel can be well described by a Gaussian distribution near the nozzle. The calculated volume fraction of the fuel indicates that the so-called liquid core near the nozzle did not exist under the test conditions examined (20–80 MPa injection pressure, 0.3–0.6 ms injection duration). Rather, the bulk of the spray was composed of a liquid/gas mixture with liquid content not exceeding 50% by volume. The maximum-density region was found at the front edge of the sprays, where the fuel volume fraction can reach 80%, and was limited to a thin layer (1–2 mm) perpendicular to the spray axis. The penetration of the front edge was found to be nonlinear with respect to injection duration within 20 mm from the nozzle.

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