This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Exhaust System Simulation of a 2-Cylinder 2-Stroke Engine Including Heat Transfer Effects
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 28, 2010 by SAE International in United States
Annotation ability available
The exhaust system design has an important influence on the charge mass and the composition of the charge inside the cylinder, due to its gas dynamic behavior. Therefore the exhaust system determines the characteristics of the indicated mean effective pressure as well. The knowledge of the heat transfer and the post-combustion process of fuel losses inside the exhaust system are important for the thermodynamic analysis of the working process. However, the simulation of the heat transfer over the exhaust pipe wall is time consuming, due to the demand for a transient simulation of many revolutions until a cyclic steady condition is reached. Therefore, the exhaust pipe wall temperature is set to constant in the conventional CFD simulation of 2-stroke engines. This paper covers the discussion of a simulation strategy for the exhaust system of a 2-cylinder 2-stroke engine until cyclic steady condition including the heat transfer over the exhaust pipe wall. The influence of the wall temperature on the gas dynamic behavior and the post-combustion process inside the exhaust pipe were investigated as well. Finally, test bench results of the fired engine were used for the validation of the simulation.
CitationJajcevic, D., Fitl, M., Schmidt, S., Glinsner, K. et al., "Exhaust System Simulation of a 2-Cylinder 2-Stroke Engine Including Heat Transfer Effects," SAE Technical Paper 2010-32-0035, 2010, https://doi.org/10.4271/2010-32-0035.
- Caton, J. A. and Heywood, J. B., “An experimental and analytical study of heat transfer in an engine exhaust port”, International Journal Heat Mass Transfer, 1981
- Konstantinidis, P. A., Koltsakis, G. C., Stamatelos, A. M. “Transient heat transfer modelling in automotive exhaust systems”, Journal of Mechanical Engineering Science, ISSN 0954-4062 (Print) 2041-2983 (Online), 1997
- Kandylas, I. and Stamatelos, A.: “Berechnung des Wärmeübergangs in Motorabgassystemen”, MTZ Motortechnische Zeitschrift 59, 1998
- Zhang, Y., Phaneuf, K., Hanson, R., and Showalter, N., “Computer Modeling on Exhaust System Heat Transfer,” SAE Technical Paper 920262, 1992, doi:10.4271/920262.
- Chen, D.K.S., “A Numerical Model for Thermal Problems in Exhaust Systems,” SAE Technical Paper 931070, 1993, doi:10.4271/931070.
- Rothbauer, R.J., Margelik, R.H., Aslam, M.M., Almbauer, R.A. et al., “Predictive Simulation Strategies for the 2-Stroke Scavenging Process within the Scope of the Development Process,” SAE Technical Paper 2005-32-0099, 2005, doi:10.4271/2005-32-0099.
- Eichlseder, H, Schmidt, S. P., Rothbauer, R. J., “Entwicklungsmethodiken bei der Konzeptentwicklung neuartiger Brennverfahren”, Internationales Symposium für Entwicklungsmethodik, S. 142-163, 2005
- Schmidt, S., Winkler, F., Schoegl, O., and Pontoppidan, M., “Development of a Combustion Process for a High Performance 2-Stroke Engine with High Pressure Direct Injection,” SAE Technical Paper 2004-01-2942, 2004, doi:10.4271/2004-01-2942.
- Rothbauer, R. J., Almbauer, R. A., Schmidt, S. P., Glinsner, K., “Effect of Energy Conversion, Turbulence and Fluid Dynamics on the Transient Heat Transfer and thus on the Scavenging of the Two Stroke Engine”, Turbulence, Heat and Mass Transfer 5, Dubrovnik, 2006
- Jajcevic, D., Almbauer, R.A., Schmidt, S.P., and Glinsner, K., “Symmetry and Time Delayed Boundary Condition for CFD Simulation and its Application in a Two-Cylinder Two-Stroke Engine,” SAE Technical Paper 2009-32-0024, 2009, doi:10.4271/2009-32-0024.
- Jajcevic, D., Almbauer, R.A., Schmidt, S.P., and Glinsner, K., “Simulation of Scavenging Process, Internal Mixture Preparation, and Combustion of a Gasoline Direct Injection Two-Cylinder Two-Stroke Engine,” SAE Technical Paper 2009-32-0046, 2009, doi:10.4271/2009-32-0046.
- Zeng, Y., Strauss, S., Lucier, P., and Craft, T., “Predicting and Optimizing Two-Stroke Engine Performance Using Multidimensional CFD,” SAE Technical Paper 2004-32-0039, 2004, doi:10.4271/2004-32-0039.
- ANSYS Fluent: “Fluent 6.3 User's Guide” Fluent Inc, 2005
- ANSYS Fluent: “UDF Manual” Fluent Inc, 2005
- Magnussen, B. F., “On the structure of turbulence and a generalized eddy dissipation concept for chemical reaction in turbulent flow”, Aerospace Science Meeting, 1981
- Jajcevic, D., Almbauer, R.A., Schmidt, S. P., Glinser, K., “Simulation Strategy and Analysis of a Two-Cylinder Two Stroke Engine Using CFD Code Fluent”, European Automotive Simulation Conference (EASC), 2009
- Schmidt, S., Schoegl, O., Rothbauer, R.J., Eichlseder, H. et al., “An Integrated 3D CFD Simulation Methodology for the Optimization of the Mixture Preparation of 2-Stroke DI Engines,” SAE Technical Paper 2007-32-0029, 2007, doi:10.4271/2007-32-0029.