Quantitative characterization of near-field fuel sprays by multi-orifice direct injection using ultrafast x-tomography technique.
- Experimental Facilities Division (APS)
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 {mu}s-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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); USDOE Laboratory Directed Research and Development (LDRD) Program
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 1007389
- Report Number(s):
- ANL/XFD/CP-117847; TRN: US1101310
- Resource Relation:
- Conference: SAE 2006 World Congress; Apr. 3, 2006 - Apr. 6, 2006; Detroit, MI
- Country of Publication:
- United States
- Language:
- ENGLISH
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