Numerical analysis of the scavenge flow and convective heat transfer in large two-stroke marine diesel engines

• Published in: Applied energy Vol. 123; pp. 37 - 46
• Main Authors: Sigurdsson, E., Ingvorsen, K.M., Jensen, M.V., Mayer, S., Matlok, S., Walther, J.H.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 15.06.2014; Elsevier
• Subjects: Applied sciences; CFD; combustion; Computational fluid dynamics; convection; Diesel engines; Energy; Energy. Thermal use of fuels; Engines and turbines; equations; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; fluid mechanics; Heat transfer; Marine; Marine diesel engines; Marine engines; Marine propulsion; Mathematical models; model validation; Navier-Stokes equations; Scavenging; Swirl; Theoretical studies. Data and constants. Metering; Two-stroke; Uniflow scavenging; BDC; CFD; Two-stroke; SPC; UD; Marine diesel engines; RANS; TDC; EVC; SPO; MARS; Swirl; Heat-transfer; LUD; Uniflow scavenging; EVO; Numerical analysis; Computational fluid dynamics; Diesel engine; Heat transfer
• ISSN: 0306-2619; 1872-9118
• DOI: 10.1016/j.apenergy.2014.02.036

•An accurate CFD model of the scavenge flow in a marine diesel engine is developed.•Conjugate heat transfer calculations are performed for the piston crown.•The combustion is accounted for by a novel heat release approach.•A detailed analysis of the scavenging flow is presented.•The temporal and spatial temperature distribution in the piston crown is presented. A novel computational fluid dynamics (CFD) model is presented for the study of the scavenging process and convective heat transfer in a large two-stroke low-speed uniflow-scavenged marine diesel engine. The engine is modeled using a fully resolved 12° sector, corresponding to one scavenge port, with cyclic boundaries in the tangential direction. The CFD model is strongly coupled to experiments and effectively provides a high order “interpolation” of the engine processes through the solution of the Reynolds-Averaged Navier–Stokes (RANS) equations subject to boundary conditions obtained through experiments. The imposed experimental data includes time histories of the pressure difference across the engine and the heat release during combustion. The model is validated by a numerical sensitivity analysis and through a comparison of model predictions and experimental data, which shows a good agreement. The results show an effective scavenging and a low convective heat loss in agreement with experimental data for large marine diesel engines.