Determination of diesel spray axial velocity using x-ray radiography.
Present knowledge of the velocity of the fuel in diesel sprays is quite limited due to the obscuring effects of fuel droplets, particularly in the high-density core of the spray. In recent years, x-ray radiography, which is capable of penetrating dense fuel sprays, has demonstrated the ability to probe the structure of the core of the spray, even in the dense near-nozzle region. In this paper, x-ray radiography data was used to determine the average axial velocity in diesel sprays as a function of position and time. Here, we report the method used to determine the axial velocity and its application to three common-rail diesel sprays at 250 bar injection pressure. The data show that the spray velocity does not reach its steady state value near the nozzle until approximately 200 {micro}s after the start of injection. Moreover, the spray axial velocity decreases as one moves away from the spray orifice, suggesting transfer of axial momentum to the surrounding ambient gas.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- EE
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 979545
- Report Number(s):
- ANL/ES/CP-58168; TRN: US201010%%761
- Resource Relation:
- Conference: SAE 2007 World Congress; Apr. 16, 2007 - Apr. 19, 2007; Detroit, MI
- Country of Publication:
- United States
- Language:
- ENGLISH
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X-ray radiography measurements of diesel spray structure at engine-like ambient density,
X-ray radiography measurements of diesel spray structure at engine-like ambient density.