LOCALLY RESOLVED INVESTIGATION OF THE VAPORIZATION OF GDI SPRAYS APPLYING DIFFERENT LASER TECHNIQUES
- 1 January 2006
- journal article
- research article
- Published by Begell House in Atomization and Sprays
- Vol. 16 (3), 319-330
- https://doi.org/10.1615/atomizspr.v16.i3.50
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.This publication has 3 references indexed in Scilit:
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- High‐pressure pure rotational CARS: comparison of temperature measurements with O2, N2 and synthetic airJournal of Raman Spectroscopy, 2003
- Dual–pump CARS for the simultaneous detection of N2, O2 and CO in CH4 flamesJournal of Raman Spectroscopy, 2002