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Atomization and Sprays

Erscheint 12 Ausgaben pro Jahr

ISSN Druckformat: 1044-5110

ISSN Online: 1936-2684

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Indexed in

LOCALLY RESOLVED INVESTIGATION OF THE VAPORIZATION OF GDI SPRAYS APPLYING DIFFERENT LASER TECHNIQUES

Volumen 16, Ausgabe 3, 2006, pp. 319-330
DOI: 10.1615/AtomizSpr.v16.i3.50
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ABSTRAKT

As an example for a highly developed technical spray system, the vaporization of isooctane fuel sprays of a gasoline direct-injection (GDI) multihole injector has been investigated in a heated injection chamber for different injection pressures and fuel temperatures ranging from 4 to 10 MPa and from 323 to 383 K, respectively. In this investigation, to the best of our knowledge, for the first time, pure rotational coherent anti-Stokes Raman spectroscopy (RCARS) has been applied to the study of vaporizing sprays in combination with other laser techniques. Gas-phase temperatures inside the sprays have been determined with high spatial and temporal resolution by RCARS. Droplet sizes and number densities have been measured using phase-Doppler anemometry, and the correlation of these results with two-dimensional laser sheet Mie scattering images allows an improved interpretation of the spray vaporization process. In particular, it was found that a vaporization barrier exists in the spray front of the GDI sprays due to the large amount of droplets available at these locations, which leads to nearly the same vaporization-dependent temperature drop of about 30 K for all pressures and fuel temperatures studied.

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