Journal
FUEL
Volume 133, Issue -, Pages 299-309Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2014.05.024
Keywords
Diesel spray; Spray dynamics; X-ray phase-contrast imaging; Orifice inlet geometry; Injection pressure
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Funding
- U.S. Department of Energy (DoE) Vehicle Technology Program
- DoE, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Japan-U.S. Cooperation Project for Research and Standardization of Clean Energy Technologies
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Unveiling the near-field dynamics of high-speed and optically dense liquid fuel jets and sprays, such as velocity and turbulence intensity fields, is of great importance for successful interpretation and modeling of the spraying and combustion process in internal combustion engines. Characterizing the dynamics using conventional laser optical techniques have been difficult in the near-nozzle region where the fuel jet, ligaments, and droplets interact with visible light strongly producing severe multiple scattering and optical opacity. Here, we use a novel technique to characterize the velocity and turbulence intensity fields of the high-speed diesel sprays in the near-field by multi-exposed X-ray phase-contrast images. With the X-ray-imaging data, the effects of the orifice inlet geometry and injection pressure on the near-field dynamics of the diesel sprays are investigated. Notable features of the spray dynamics in the near-nozzle region and beyond are discussed by comparing the measurement results with the predictions of conventional gas jet theories. (C) 2014 Elsevier Ltd. All rights reserved.
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