A Three-Zone Scavenging Model for Large Two-Stroke Uniflow Marine Engines Using Results from CFD Scavenging Simulations

Michael I. Foteinos, Alexandros Papazoglou, Nikolaos P. Kyrtatos, Anastassios Stamatelos, Olympia Zogou and Antiopi-Malvina Stamatellou
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Michael I. Foteinos: Laboratory of Marine Engineering, National Technical University of Athens, GR-15780 Athens, Greece
Alexandros Papazoglou: Laboratory of Marine Engineering, National Technical University of Athens, GR-15780 Athens, Greece
Nikolaos P. Kyrtatos: Laboratory of Marine Engineering, National Technical University of Athens, GR-15780 Athens, Greece
Anastassios Stamatelos: Laboratory of Thermodynamics & Thermal Engines, University of Thessaly, GR-38334 Volos, Greece
Olympia Zogou: Laboratory of Thermodynamics & Thermal Engines, University of Thessaly, GR-38334 Volos, Greece
Antiopi-Malvina Stamatellou: Laboratory of Thermodynamics & Thermal Engines, University of Thessaly, GR-38334 Volos, Greece

Energies, 2019, vol. 12, issue 9, 1-20

Abstract: The introduction of modern aftertreatment systems in marine diesel engines call for accurate prediction of exhaust gas temperature, since it significantly affects the performance of the aftertreatment system. The scavenging process establishes the initial conditions for combustion, directly affecting exhaust gas temperature, fuel economy, and emissions. In this paper, a semi-empirical zero-dimensional three zone scavenging model applicable to two-stroke uniflow scavenged diesel engines is updated using the results of CFD (computational fluid dynamics) simulations. In this 0-D model, the engine cylinders are divided in three zones (thermodynamic control volumes) namely, the pure air zone, mixing zone, and pure exhaust gas zone. The entrainment of air and exhaust gas in the mixing zone is specified by time varying mixing coefficients. The mixing coefficients were updated using results from CFD simulations based on the geometry of a modern 50 cm bore large two-stroke marine diesel engine. This increased the model’s accuracy by taking into account 2-D fluid dynamics phenomena in the cylinder ports and exhaust valve. Thus, the effect of engine load, inlet port swirl angle and partial covering of inlet ports on engine scavenging were investigated. The three-zone model was then updated and the findings of CFD simulations were reflected accordingly in the updated mixing coefficients of the scavenging model.

Keywords: two-stroke engine; uniflow scavenging; 0-D modelling; scavenging model; CFD simulations (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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