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Atomization and Sprays

Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

Institutional price:	$787.00
Issues per year:	8

Best Paper Award Selection - Editorial Board Site

2006, Volume16

116 pages

Issue price - $80.00

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

Frank Beyrau
Lehrstuhl für Technische Thermodynamik (LTT), Universität Erlangen-Nürnberg, Am Weichselgarten 8, D-91058 Erlangen, Germany

Markus Christian Weikl
Lehrstuhl für Technische Thermodynamik (LTT), Universität Erlangen-Nürnberg, Am Weichselgarten 8, D-91058 Erlangen, Germany

Ingo Schmitz
Lehrstuhl für Technische Thermodynamik (LTT), Universität Erlangen-Nürnberg, Am Weichselgarten 8, D-91058 Erlangen, Germany

Thomas Seeger
Lehrstuhl für Technische Thermodynamik (LTT), Universität Erlangen-Nürnberg, Am Weichselgarten 8, D-91058 Erlangen, Germany

Alfred Leipertz
Lehrstuhl für Technische Thermodynamik (LTT), Universität Erlangen-Nürnberg, Am Weichselgarten 8, D-91058 Erlangen, Germany

ABSTRACT

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.