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Atomization and Sprays
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ISSN Druckformat: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v11.i4.100
pages 471-490

QUANTITATIVE MEASUREMENTS OF DIESEL FUEL SPRAY CHARACTERISTICS IN THE NEAR-NOZZLE REGION USING X-RAY ABSORPTION

Yong Yue
Argonne National Laboratory, Argonne, Illinois, USA
Christopher F. Powell
Energy Systems Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
Ramesh Poola
Argonne National Laboratory, Argonne, Illinois, USA
Jinn-Chyi Wang
Department of Food Science and Technology, Tajen University, Pingtung, Taiwan
Johannes K. Schaller
Robert Bosch GmbH, Stuttgart, Germany

ABSTRAKT

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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