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Scavenging Process Simulation |
Figure: Scavenging process of a 2-stroke engine [1]
The principle of exhaust gas exchange with the fresh incoming charge inside the cylinder volume is called scavenging process and has a significant influence on the engine efficiency. Therefore, the process has to be calculated with a high level of accuracy taking into account the intake and exhaust systems. The calculation of engine characteristics, such as delivery ration, scavenge ratio, scavenging efficiency, trapping efficiency, and rest/exhaust gas fractions, is primary aim.
Solution
For an efficient and accurate simulation in a shorter calculation time required for industry the intake and exhaust system can be replaced by corresponding boundary conditions. The boundary condition are usually obtained from fast calculating 1D-codes and are considered as input data for the 3D-CFD calculation. In order to get high accurate results, a coupled 1D-3D simulation can be also performed. In the case, the influence of the scavenging process on the intake and exhaust system and vice verse is take into account. Introducing additional scalar transport equations the above mentioned engine characteristics can be easily obtained. Finally, the SES-Tec provides an automatized work flow for pre- and post-processing processes, so that variant studies, related to change of engine geometry, engine operating points etc., can be carried out in a very short calculation time.
Customer Benefits
The customer benefits can be summarized as follows:
- High level of simulation accuracy thanks quality management of results
- Scavenging process simulation including all engine components
- Short calculation time adapted for industry thanks high performance computing
- Automatized work flow
Related Publications
[1] Jajcevic D., Almbauer R.A., Schmidt S. P., Glinser K., Fitl M., “CFD study of spray design for a GDI high performance 2-stroke engine”, SAE Paper 2010-32-0014/20109014 and Presentation at SETC in Linz, 2010
[2] Jajcevic D., Almbauer R.A., Schmidt S. P., Glinser K., “CFD Simulation of a Real World High-Performance Two Stroke Engine with Use of a Multidimensional Coupling Methodology”, SAE Paper 2008-320042/20084742 and Presentation at SETC in Milwaukee, 2008 |
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