Abstract
Heavy fuel oil (HFO) is the predominant marine fuel. In the present study, a detailed model of HFO thermophysical properties, recently developed by the authors, is utilized for extensive computational fluid dynamics (CFD) studies of HFO spray dynamics in a large spray combustion chamber (SCC) and in a large marine engine; results are compared against existing and new experiments, for two HFO qualities. Here, spray modeling is based on a proper adaptation of the cascade atomization and drop break-up (CAB) model, whereas a new kinetic model accounting for HFO aromaticity is used for ignition modeling. Computational results are reported for nonreactive and reactive spray flow in the SCC, and are in good agreement with experimental data. The effects of HFO preheating on spray development are demonstrated. Finally, simulation results in a large marine engine are in good agreement with experiments in terms of pressure, heat release rate, and pollutant emissions. Overall, the present modeling is shown to be appropriate for detailed CFD studies of HFO spray flow and combustion in marine engines.
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Acknowledgments
The first author thanks the DNV-GL Classification Society, for financing his doctoral thesis project. The experimental investigations have been conducted as part of the HERCULES-C project within EC’s 7th Framework Program, Contract number SCP1-GA-2011-284354. Additional financial support by the Swiss Federal Government (SFOE Contract SI/500940-01, TP Nr 8100075, Project name “FlexiFuel Combustion”) is gratefully acknowledged. The authors thank Mr. D. Kazangas of NTUA, for his substantial support and many helpful discussions.
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Published In
Journal of Energy Engineering
Volume 145 • Issue 5 • October 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Nov 6, 2018
Accepted: Jan 4, 2019
Published online: Jul 12, 2019
Published in print: Oct 1, 2019
Discussion open until: Dec 12, 2019
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