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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/24166

Title: Droplet size development in a DISI injector fuel spray
Authors: Jiang, C.
Parker, Matthew C.
Spencer, Adrian
Wigley, Graham
Garner, Colin P.
Helie, J.
Keywords: Droplet size distribution
Evaporation
PDA measurement
Joint PDF
Dense sprays
Internal combustion engine
Issue Date: 2016
Publisher: © LISBON Simposia
Citation: JIANG, C. ... et al, 2016. Droplet size development in a DISI injector fuel spray. IN: Proceedings of the 18th International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics, Lisbon, Portugal, 4th-7th July 2016, pp. 2834-2847.
Abstract: In this work, Phase Doppler Anemometry (PDA) measurements are used to test the hypothesis that the mean droplet size in Direct Injection Spark Ignition (DISI) engine fuel spray increases with distance from the injector due to the evaporation of the smaller droplets. In order to understand the role of evaporation, two velocity components and drop size PDA measurements were performed for one plume of a DISI injector using two fuels with widely differing vapour pressures. The measurements were taken along the plume centreline at four different vertical distances from the injector tip between 20 to 50 mm. on the plume centreline to evaluate the development of droplet size distributions along the plume. Measurements are also made across the plume (perpendicular to the plume centreline) at the 30 and 50 mm locations. Measurements using PDA closer to the injector are more difficult due to the high spray density (particularly apparent at 20mm or closer to the injector). A data fitting process is suggested using joint probability distribution functions (JPDFs) to reduce the effect of statistical significance where data rates are low. This improves the description of the PDA derived drop size distribution in regions where the data validation rate is poor. It is found that the evaporation is not the main cause for droplet size increase along the plume. The most likely reason for the increase of the Sauter Mean Diameter (SMD) with distance from the injector is that the smaller droplets move away from the plume centreline through turbulent diffusion at a higher rate compared to larger droplets. Higher axial momentum of the larger droplets reduces their response to turbulent velocity fluctuations and hence their path-lines are less prone to stray from their initial trajectory.
Description: This is a conference paper.
Sponsor: The authors would like to acknowledge the financial support of the Advanced Propulsion Centre (APC) for this work which was undertaken as part of TSB/APC project number 101891.
Version: Accepted version
URI: https://dspace.lboro.ac.uk/2134/24166
Publisher Link: https://www.lisbonsimposia.org/blank-cjg9
Appears in Collections:Conference Papers and Contributions (Mechanical, Electrical and Manufacturing Engineering)
Conference Papers and Presentations (Aeronautical and Automotive Engineering)

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