This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Numerical Investigation of the Scavenging Process in Marine Two-Stroke Diesel Engines
Technical Paper
2013-01-2647
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The scavenging process is an integral part of any two-stroke internal combustion engine cycle whether it is spark ignited or compression ignited. The scavenging process is responsible for transporting the burned gases from the previous working stroke out of the combustion chamber to allow for the fresh charge or fresh air to enter for the next combustion/working stroke. This implies that the scavenging process is responsible for setting the initial condition for the combustion process, consequently affecting fuel economy, power output and emission of hazardous gases. Two-stroke diesel engines for marine propulsion are usually uniflow scavenged cross-head engines. In uniflow scavenged engines the scavenge air enters the cylinder via ports located near the bottom dead center and exits through an exhaust valve located in the cylinder head. The in cylinder flow is therefore concentrated in one direction which gives the method its name.
In this study a CFD analysis of the scavenging process in the 4T50ME-X test engine at MAN Diesel & Turbo is presented. The CFD model uses the full engine geometry including a moving piston and valve combined with time resolved measurement data as boundary and initial conditions. The results are then validated with experimental data from the engine. Optical velocity measurements have been performed through a specially designed engine cover with optical access.
Recommended Content
Authors
Topic
Citation
Andersen, F., Hult, J., Nogenmyr, K., and Mayer, S., "Numerical Investigation of the Scavenging Process in Marine Two-Stroke Diesel Engines," SAE Technical Paper 2013-01-2647, 2013, https://doi.org/10.4271/2013-01-2647.Also In
References
- Heywood JB , and Sher E , The Two-stroke cycle engine: its Development, Operation and Design Taylor and Francis Philidelphia 1999
- Ferro , A. Investigation by means of models into the scavenging of two-stroke internal combustion engines The engineers' Digest 19 1958 512 522
- Percival WH Method of scavenging analysis for 2-cycle diesel engines Society of Automotive engineers-papers 63 737 751 1955
- Sher , E , Hossain , I , Zhang , Q and winterbone , D.E Calculations and Measurments in the Cylinder of a Two-Stroke Uniflow-Scavenged Engine Under Steady Flow Conditions Experimental Thermal and Fluid Science 418 431 1991
- Litke , B The influence of inlet angles in inlet ports on the scavenging process in two-stroke uniflow-scavenged engine Marine technology III 45 1999
- Lamas , I.L. and Vidal , C.G.R Computational Fluid Dynamics Analysis of the Scavenging Process in the MAN B&W 7S50MC Two-Stroke Marine Diesel Engine Journal of Ship Research 56 154 161 2012
- Stone , R. Introduction to Internal Combustion Engines Macmillan press LTD 1999
- Heywood , J.B. Internal Combustion Engine Fundamentals McGraw-Hill Book Company 1988
- Al-Mousawi N,M,J Numerical Simulation in a model Diesel engine using RANS and LES turbulence models Master thesis Technical University of Denmark 2012
- Rutland , C.J. Large-eddy simulations for internal combustion engines-a review International Journal of Engine Research 2011
- Mayer . S , Clausen . S , Hult . J , Nogenmyr . K.J Advanced optical development tools for two-stroke marine diesel engines CIMAC conference 2013 53 2013
- Hult . J , Mayer . S A methodology for laser diagnostics in large-bore two-stroke diesel engines Measurement Science and Technology 2013 10.1088/0957-0233/24/4/045204
- Favre . A Equations des gaz turbulent compressibles Journal de Mechanique 4 361 421 1965
- Ferziger J.H , Peric M. Computational Methodes for Computional Fluid Dynamics Third Springer 2002
- Beaudoin . M , Jasak . H Development of a Generalized Grid Interface for Turbomachinery simulations with OpenFOAM Open source CFD international conference 2008
- Kornev . N , Kröger . H and Hassel . E Synthesis of homogenous anisotropic turbulent fields with prescribed second-order statistics by the random spots method Communications in numerical methods in engineering 875 877 2008 10.1002/cnm.1009
- Gupta , A.K. Lilley , D.G , Syred , N. Swirl Flows Turnbridge Wells, Kent Abacus press 1984
- Nakagawa . H , Kato . S , Tataishi . M , Adachi . T , Tsujimura . H and Nakashima . M Airflow in the Cylidner of a 2-stroke Cycle Uniflow Scavenging Diesel Engine During compression Stroke Japan society of mechanical enginers, Series III 3 3 1990
- Sigurdsson . E Scavenging flow in a Two-Stroke Diesel Engine Master thesis Technical University of Denmark 2011
- Haider . S Experimental and Numerical Study of Swirling Flow in Scavenging Process for 2-Stroke Marine Diesel Engines Ph.D. thesis Technical University of Denmark 2011
- Veynante . D Turbulent Combustion Modeling Progress in energy and combustion science 28 3 2002
- OpenFOAM User Guide Version 1.6 14 July 2009 OpenCFD LDT. www.openfoam.org www.extend-project.de