Computational Design Studies for a High-Efficiency and Low-Emissions Free Piston Engine Prototype 2004-01-2928
The current work is based on the computational design optimisation for a two-stroke, uniflow scavenging free piston engine prototype for use in series hybrid vehicles to reach high efficiency levels combined with low emissions. Here the performance goals have been attempted via Homogeneous Charge Compression Ignition (HCCI) Diesel combustion with increased levels of exhaust gas recirculation (EGR) and direct injection. For optimal mixture preparation and composition, a highly tuned gas exchange system is required and also adapted injection parameters are needed to induce heat release at around top dead center (TDC).
A computational methodology has been developed based on iterations between zero-, one-dimensional and simplified Computational Fluid Dynamics (CFD) simulations to define the operating conditions and overall geometrical parameters which give the best engine performance. Based on these findings, more detailed three-dimensional CFD calculations have been used to specify the optimal intake and exhaust port configurations and injection characteristics. They also serve as a basis for validation of the performance results from the iterations. It is demonstrated that an indicated efficiency of above 50% and low emission levels for soot and NOx can be ensured via a high compression ratio, elevated EGR rates and HCCI combustion using direct injection and early injection timing.
Citation: Kleemann, A., Dabadie, J., and Henriot, S., "Computational Design Studies for a High-Efficiency and Low-Emissions Free Piston Engine Prototype," SAE Technical Paper 2004-01-2928, 2004, https://doi.org/10.4271/2004-01-2928. Download Citation
Author(s):
A. P. Kleemann, J.-C. Dabadie, S. Henriot
Affiliated:
IFP, France
Pages: 14
Event:
2004 Powertrain & Fluid Systems Conference & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
New Powertrain Systems and Components-SP-1902, SAE 2004 Transactions Journal of Fuels and Lubricants-V113-4
Related Topics:
Exhaust gas recirculation (EGR)
Computational fluid dynamics
Combustion and combustion processes
HCCI engines
Two stroke engines
Hybrid electric vehicles
Emissions
Pistons
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