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Examples of line-of-sight projected fuel mass density distribution derived from the radiographic images of the hollow-cone fuel sprays collected at , , , , , and projection angles at time instances of 0.23, 0.33, 0.62, and 1.23 ms after the SOI. The exposure time of each radiographic image is . The rotation angular increment is .
Reconstructed hollow-cone sprays based on 180 projections at each time instance from 0.16 (immediately after the start of injection) to 1.33 ms (end of injection) showing the development of the hollow-cone sprays throughout the 1.33 ms injection event. Detailed features of the spray including asymmetric fuel distributions can be readily observed. The time-resolved three-dimensional fuel distribution is reconstructed quantitatively as the false color represents the density of the fuel in unit of .
Comparison between the sinogram data from the measured radiographic images and the reconstructed spray distribution projected to different directions at 3.5 mm from the nozzle and after the SOI.
Comparison of liquid-fuel VF distribution between the CFD numerical simulation and experimental results. The simulated cross-sectional VF at selected spray cross sections (2, 3, 4, and 5 mm from the nozzle exit) are shown in (a), (b), (c), and (d), respectively. The radial distributions of the fuel VF at the selected cross-sectional planes are shown inside of (a), (b), (c), and (d), respectively. The measured and simulated peak fuel VF values in each cross-sectional planes are plotted in (e) and the hollow-cone spray wall thickness (full width at half maximum) in (f) along the spray axis.
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