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Title: Quantification of diesel injector dribble using 3D reconstruction from x-ray and DBI imaging
Authors: Sechenyh, Vitaliy
Turner, Jack
Sykes, Dan
Duke, Daniel J.
Swantek, Andrew B.
Matusik, Katarzyna E.
Kastengren, Alan L.
Powell, Christopher F.
Viera, Alberto
Payri, Raul
Crua, Cyril
Keywords: Diesel injector
Droplet shape
Issue Date: 2017
Publisher: Editorial Universitat Politecnica de Valencia
Citation: SECHENYH, V. ... et al, 2017. Quantification of diesel injector dribble using 3D reconstruction from x-ray and DBI imaging. IN: Payri, R. and Margot, X. (eds). Proceedings of ILASS-Europe 2017, 28th Conference on Liquid Atomization and Spray Systems, Valencia, Spain, 6-8 September 2017, pp.216-223.
Abstract: Post-injection dribble is known to lead to incomplete atomisation and combustion due to the release of slowmoving, and often surface-bound, liquid fuel after the end of the injection event. This can have a negative effect on engine emissions, performance, and injector durability. To better quantify this phenomenon we present a new image processing approach to quantify the volume and surface area of ligaments produced during the end of injection, for an ECN ‘Spray B’ 3-hole injector. Circular approximation for cross-sections was used to estimate three-dimensional parameters of droplets and ligaments. The image processing consisted in three stages: edge detection, morphological reconstruction, and 3D reconstruction. For the last stage of 3D reconstruction, smooth surfaces were obtained by computation of the alpha shape which represents a bounding volume enveloping a set of 3D points. The object model was verified by calculation of surface area and volume from 2D images of figures with well-known shapes. We show that the object model fits non-spherical droplets and pseudo-cylindrical ligaments reasonably well. We applied our processing approach to datasets generated by different research groups to decouple the effect of gas temperature and pressure on the fuel dribble process. High-speed X-ray phase-contrast images obtained at room temperature conditions (297 K) at the 7-ID beamline of the Advanced Photon Source at Argonne National Laboratory, together with diffused back-illumination (DBI) images captured at a wide range of temperature conditions (293-900 K) by CMT Motores Térmicos, were analysed and compared quantitatively.
Description: This is an Open Access Article. It is published by Editorial Universitat Politecnica de Valencia under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence (CC BY-NC-ND). Full details of this licence are available at: http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor: This work was supported by the UK’s Engineering and Physical Science Research Council [grants EP/K020528/1 and EP/M009424/1], and BP Formulated Products Technology. This research was partially funded by DOE's Vehicle Technologies Program, Office of Energy Efficiency and Renewable Energy.
Version: Published
DOI: 10.4995/ILASS2017.2017.4742
URI: https://dspace.lboro.ac.uk/2134/32079
Publisher Link: https://doi.org/10.4995/ILASS2017.2017.4742
Appears in Collections:Conference Papers and Presentations (Mechanical, Electrical and Manufacturing Engineering)

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