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Effects of Ambient Pressure on Dynamics of Near-Nozzle Diesel Sprays Studied by Ultrafast X-Radiography
Technical Paper
2004-01-2026
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A time-resolved x-radiographic technique has been employed for measuring the fuel distribution close to a single-hole nozzle fitted in a high-pressure diesel injector. Using a monochromatic synchrotron x-ray beam, it is possible to perform quantitative x-ray absorption measurements and obtain two-dimensional projections of the mass of the fuel spray. We have completed a series of spray measurements in the optically dense, near-nozzle region (< 15 mm from the nozzle orifice) under ambient pressures of 1, 2, and 5.2 bar N2 and 1 bar SF6 at room temperature with injection pressures of 500 and 1000 bar. The focus of the measurements is on the dynamical behaviors of the fuel jets with an emphasis on their penetration in the near-nozzle region. Careful analysis of the time-resolved x-radiographic data revealed that the spray penetration in this near nozzle region was not significantly affected by the limited change of the ambient pressure. In addition, well-defined features of the spray, such as the leading and trailing edges, and fluctuations of fuel mass density in the spray body, allowed us to calculate the leading, trailing, and internal speeds of the sprays.
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Authors
- Seong-Kyun Cheong - Advanced Photon Source, Argonne National Laboratory
- Jinyuan Liu - Advanced Photon Source, Argonne National Laboratory
- Deming Shu - Advanced Photon Source, Argonne National Laboratory
- Jin Wang - Advanced Photon Source, Argonne National Laboratory
- Christopher F. Powell - Center for Transportation Research, Argonne National Laboratory
Topic
Citation
Cheong, S., Liu, J., Shu, D., Wang, J. et al., "Effects of Ambient Pressure on Dynamics of Near-Nozzle Diesel Sprays Studied by Ultrafast X-Radiography," SAE Technical Paper 2004-01-2026, 2004, https://doi.org/10.4271/2004-01-2026.Also In
Mixture Preparation, Combustion and Emission Formation Processes in SI Engines, and Diesel Spray and Mixture Formation
Number: SP-1888; Published: 2004-06-08
Number: SP-1888; Published: 2004-06-08
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