Computational Analysis of Spray Formation in Large Two-Stroke Marine Diesel Engine Atomizers
Publication: Journal of Energy Engineering
Volume 147, Issue 2
Abstract
Large two-stroke marine diesel engines have special injector geometries which differ substantially from the configurations used in most other diesel engine applications. In particular, injector orifices are distributed in a highly nonsymmetric arrangement, thus affecting the spray characteristics. In this study, a new approach was implemented in computational fluid dynamics (CFD) simulations of these sprays, for nonevaporating conditions, for one noneccentric and two eccentric atomizers. The approach consisted of modeling spray primary breakup using large eddy simulation (LES), and modeling spray secondary breakup by means of Reynolds-Averaged Navier–Stokes (RANS) equations in conjunction with validated spray models. LES results were processed using a new droplet identification method, yielding probability density functions (PDFs), which were used as input in the secondary breakup simulations. Spray morphology was characterized in terms of penetration length, deflection angles, and spray cone angles. Results were in good agreement with those of recent experiments in a large spray combustion chamber, verifying strong deviation from an axisymmetric spray structure; they outperformed CFD results using a conventional (RANS-only) method. Overall, the present approach was shown to be effective for CFD studies of asymmetric sprays in large marine engines.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research has been funded by the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme FP7/2007-2013/ under Research Executive Agency (REA) grant agreement 607214. The work was done at Winterthur Gas & Diesel, Department of Diesel Engine Performance, Switzerland; and the National Technical University of Athens. The authors thank Alexandros Panagoulias of Siemens Industry Software for his effective support and for helpful discussions. Initial results of the present work were reported by Nagy et al. (2015, 2016, 2017).
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Journal of Energy Engineering
Volume 147 • Issue 2 • April 2021
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© 2020 American Society of Civil Engineers.
History
Received: May 22, 2020
Accepted: Aug 25, 2020
Published online: Dec 29, 2020
Published in print: Apr 1, 2021
Discussion open until: May 29, 2021
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