Quantitative Characterization of Near-Field Fuel Sprays by Multi-Orifice Direct Injection Using Ultrafast X-Tomography Technique

by: Xin Liu, Kyoung-Su Im, Yujie Wang, Jin Wang, David L.S. Hung, James R. Winkelman, Mark W. Tate, Alper Ercan, Lucas J. Koerner, Thomas Caswell, Darol Chamberlain, Daniel R. Schuette, Hugh Philipp, Detlef M. Smilgies, Sol M. Gruner 18 Jan 2008 | 813 views
Year: 2006 | Document Type: PAPER | File Format: pdf | Language: uk
Quantitative Characterization of Near-Field Fuel Sprays by Multi-Orifice Direct Injection Using Ultrafast X-Tomography Technique
Society of Automotive Engineers (SAE) Technical Paper 2006-01-1041

Abstract/Summary

A low-pressure direct injection fuel system for spark ignition direct injection engines engines has been developed, in which a high-turbulence nozzle technology was employed to achieve fine fuel droplet size at a low injection pressure around 2 MPa. It is particularly important to study spray characteristics in the nearnozzle region due to the immediate liquid breakup at the nozzle exit.

By using an ultrafast x-ray area detector and intense synchrotron x-ray beams, the interior structure and dynamics of the direct injection gasoline sprays from a multi-orifice turbulence-assisted nozzle were elucidated for the first time in a highly quantitative manner with μs-temporal resolution.

Revealed by a newly developed, ultrafast computed x-microtomography technique, many detailed features associated with the transient liquid flows are readily observable in the reconstructed spray. Furthermore, an accurate 3-dimensional fuel density distribution, in the form of fuel volume fraction, was obtained by the time-resolved computed tomography.

The time-dependent fuel density distribution revealed that the fuel jet is well broken up immediately at the nozzle exits.

These results not only reveal the near-field characteristics of the partial atomized fuel sprays with unprecedented detail, but also facilitate the development of an advanced multi-orifice direct injector. This ultrafast tomography capability also will facilitate the realistic computational fluid dynamic simulations in highly transient and multiphase fuel spray systems.

(Source: Gruner Group - Cornell University)

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