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Strategies to Reduce Scavenge Losses of Small Capacity 2-Stroke Engines, Pressurized by the Common Market Costs
Technical Paper
2005-32-0098
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English
Abstract
More and more restrictive regulations, as the pending Euro3 emission legislation, demand for a lowering of exhaust emissions of two stroke engines.
The reduction of scavenge losses is one of the key requirements for the development of two-stroke engines. Besides it is important to maintain the excellent torque and power behavior of the two stroke units. This publication gives a summary of previous and present development results of test bench and chassis dynamometer measurements and of 3D CFD simulations. All these results are targeted on a reduction of the scavenge losses and therewith HC-emissions. Therefore the focus is put on different injection strategies, such as semi-direct and air-assisted injection.
Additionally, the potential of the high pressure gasoline direct injection is presented, even if this technology is still too expensive for the small capacity engine market, e.g. the European 50 cc scooter class. As a promising alternative to the aforementioned strategies new ideas to reduce the scavenge losses are introduced. These concepts have to be realized by using cost-efficient standard injection components from state of the art intake manifold injection systems. The goal of this type of injection is to achieve Euro3 emission standards with up to 30% lower system costs compared to state of the art air-assisted injection systems.
These new ideas can be described in terms of stratified scavenging. Due to the accurate positioning of the injectors, a stratified mixture preparation or homogeneous mixture preparation can be obtained, before entering the combustion camber. For different load and engine speed variations, the benefits of the different mixture preparations will be pointed out.
A potential estimation of this scavenge strategy will be shown by results of 3D-CFD simulations, comparing homogeneous (air and fuel) scavenging, air-assisted injection, high pressure direct injection, and stratified scavenging.
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Authors
- Franz WINKLER - Graz University of Technology, Institute for Internal Combustion Engines & Thermodynamics, Engine Research
- Roland KIRCHBERGER - Graz University of Technology, Institute for Internal Combustion Engines & Thermodynamics, Engine Research
- Oliver SCHOEGL - Graz University of Technology, Institute for Internal Combustion Engines & Thermodynamics, Engine Research
- Stephan SCHMIDT - Graz University of Technology, Institute for Internal Combustion Engines & Thermodynamics, Engine Research
Citation
WINKLER, F., KIRCHBERGER, R., SCHOEGL, O., and SCHMIDT, S., "Strategies to Reduce Scavenge Losses of Small Capacity 2-Stroke Engines, Pressurized by the Common Market Costs," SAE Technical Paper 2005-32-0098, 2005.Also In
References
- Nuti M. Emissions from Two-Stroke Engines SAE Book 1998 169 205
- Ambler M. Zocchi A. Development of the Aprilia DITECH 50 engine„
- Stan C. C. Lefebvre J.-L. Lebrun M. Development, Modeling and Engine Adaptation of a Gasoline Direct Injection System for Scooter Engines SAE Paper No. 1999-01-3313
- Gambino M. Iannaccone S. Two-Stroke Direct Injection Spark Ignition Engine for Two Wheelers SAE Paper No. 2001-01-1842
- Duret P. Lavy J. Venturi St. SCIP Simplified Direct Injection for Low Emissions Small Two-Stroke Engines SAE Paper No. 1999-01-3289
- Samaras Z. Ntziachristos L. Mamakos A. Xanthopoulos A. Iakovou E. Impact assessment/Package of New Requirements Relating to the Emissions from Two and Three-Wheel Motor Vehicles 2004 http://europa.eu.int/comm/enterprise/automotive/mveg_meetings/meeting96/ptw_final_report.pdf
- Korman M. Hirz M. Eichlseder H. Kirchberger R. Impact of Future Emission Regulation on Different 50 cc Engine Concepts Development Trends of Motorcycles Haus der Technik Bologna (Italy) 04 2005
- Hirz M. Korman M. Eichlseder H. Kirchberger R. Potential of the 50 cc two wheeler motor vehicle class in respect of future exhaust emission targets SAE Paper No. 2004-32-0050
- Kirchberger R. Koller G. Possible solutions for Euro 2 „low emission low cost” 50 cc engines IAT '03 Koper (Slovenia) 2003
- Schmidt S. Winkler F. Schögl O. Pontoppidan Michael Development of a Combustion Process for a High Performance 2-Stroke Engine with High Pressure Direct Injection SAE Paper No. 2004-32-2942
- Pontoppidan M. Gaviani G. Bella G. de Maio A. Optimization By Cfd Simulation of Spray Formation Parameters to Adapt Direct Injection High-Pressure Fuel Injectors to High-Speed SI Engines SAE Paper No. 2004-01-0539
- Kirchberger R. Graz University of Technology 2003
- Development of a Direct Injection Two-Stroke Engine for Scooters 55 Marzo Aprile 2002
- Dell'Orto P. Dell'Orto Electronic Carburetor SAE Paper No 2001 01 1862 | 4283 2001
- Hopkinson B. The Charging of Two-Cycle Internal Combustion Engines Transactions of the NE Coast Institution of engineers an Shipbuilders
- Benson R. S. a New Gas Dynmic model for the Gas Exchange Process in Two-Stroke Loop and Cross Scavenging Engines Int. J. Mech. Sci 19 693 711 1977
- Merker G. P. Gerstle M. Evaluation on Two Stroke Engines Scavenging Models SAE Paper No. 970358
- Tobis B. J. Scavenging of a Firing Two-Stroke Spark-Ignition Engine SAE Paper No. 940393
- Stuecke P. Egbers Ch. Geyer W. Visualization of the Scavenging Flow of Small Two-Stroke Cylinders SAE Paper No. 2004-32-0010
- AVL Fire Version 8.3: CFD Solver
- Elligott S. Mc. Douglas R. Kenny R. G. Glover S. An assessment of a Stratified Scavenging Process Applied to a Loop Scavenged Two- Stroke Engine SAE Paper No 1999-01-3272
- Cunnigham G. Kee R. J. Kenny G. Skelton William J. Development of a Stratified Scavenging System for Small Capacity Two-Stroke Engines SAE Paper 1999-01-3270
- Nagesh S. Mavinahally An Historical Overview of stratified Scavenged Two Stroke Engines- 1901 through 2003 SAE Paper No. 2004-32-008
- Blair G. P. Stratified-Charge Two Stroke Internal Combustion Engines 1975
- Bennett G. A simplified ‘Inlet System for Stratified Charging of Two-Stroke Engines Queens University of Belfast 1985
- AVL Fire Version 8.3; Spray