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Determination of Diesel Spray Axial Velocity Using X-Ray Radiography
Technical Paper
2007-01-0666
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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 μs 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.
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Authors
- Alan L. Kastengren - Argonne National Laboratory
- Christopher F. Powell - Argonne National Laboratory
- Seong-Kyun Cheong - Argonne National Laboratory
- Yujie Wang - Argonne National Laboratory
- Kyoung-Su Im - Argonne National Laboratory
- Xin Liu - Argonne National Laboratory
- Jin Wang - Argonne National Laboratory
- Thomas Riedel - Robert Bosch GmbH
Topic
Citation
Kastengren, A., Powell, C., Cheong, S., Wang, Y. et al., "Determination of Diesel Spray Axial Velocity Using X-Ray Radiography," SAE Technical Paper 2007-01-0666, 2007, https://doi.org/10.4271/2007-01-0666.Also In
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