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Development Process to Optimize Design and Performance of Small Gasoline Engines
Published October 30, 2007 by Society of Automotive Engineers of Japan in Japan
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The further optimization of modern gasoline engines needs sophisticated development tools to meet future emission legislation and fuel consumption targets. The multi-dimensional optimization process has to take into account parameters like
Cylinder head and port flow design
Valve train variabilities (e.g. camphasers, variable valve lift systems)
In-cylinder charge motion and interaction with mixture preparation
Resulting combustion characteristics
Naturally aspirated and boosted operating conditions
The paper presents an advanced development process, where a dedicated interaction between
Gas dynamics and CFD simulation,
Optical analysis tools (3D-PIV) and
Engine test bench
Simulation approaches are typically used during the first concept and following design phase. Due to the complexity of simulation models and the need for a detailed validation, advanced optical analysis tools need to be integrated in the development process. Among others a 3D-PIV test bench is set-up to analyze the flow pattern inside the cylinder especially during the intake phase in all relevant details. The validated model is then used to improve quality of combustion simulation and a higher accuracy of process prediction is realized. The simulation prediction is finally checked by engine test bench investigations.
The methodology is exemplary shown for small displacement engine versions. Finally, a detailed assessment can be realized, which takes into account all relevant development targets.
CitationLANG, l., ADOMEIT, P., SCHMITT, P., TIEMANN, C. et al., "Development Process to Optimize Design and Performance of Small Gasoline Engines," SAE Technical Paper 2007-32-0093, 2007.
- Adomeit Philipp Hopp Martin Schmidt Anton Lang Oliver Schmitt Peter “CAE-Based Port Development and Flow Design for SI Engines” SAE Paper 2005-01-0243
- Ewald Jens “A Level Set Based Flamelet Model for the Prediction of Combustion in Homogeneous Charge and Direct Injection Spark Ignition Engines” Dissertation, RWTH Aachen 2006
- Wiese Wolfram Adomeit Philipp Ewald Jens “Charge Motion Development for the Realisation of Robust SI Combustion Systems” The Working Process of the Internal Combustion Engine Eichlseder Helmut Verlag der TU Graz 2007