Quantitative Characterization of Near-Field Fuel Sprays by Multi-Orifice Direct Injection Using Ultrafast X-Tomography Technique 2006-01-1041
A low-pressure direct injection fuel system for spark ignition direct injection 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 near-nozzle 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.
Citation: Liu, X., Im, K., Wang, Y., Wang, J. et al., "Quantitative Characterization of Near-Field Fuel Sprays by Multi-Orifice Direct Injection Using Ultrafast X-Tomography Technique," SAE Technical Paper 2006-01-1041, 2006, https://doi.org/10.4271/2006-01-1041. Download Citation
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
Argonne National Laboratory, Visteon Corporation, Cornell University
SAE 2006 World Congress & Exhibition
Combustion and Flow Diagnostics and Fundamental Advances in Thermal Fluid Sciences 2006-SP-2015, SAE 2006 Transactions Journal of Engines-V115-3