Published 12 issues per year
ISSN Print: 1044-5110
ISSN Online: 1936-2684
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QUANTITATIVE MEASUREMENTS OF DIESEL FUEL SPRAY CHARACTERISTICS IN THE NEAR-NOZZLE REGION USING X-RAY ABSORPTION
ABSTRACT
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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