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Proposition of a Stratified Charge System by Using In-Cylinder Gas Motion
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English
Abstract
A new idea for controlling the in-cylinder mixture formation in SI engines is proposed. This concept was developed by applying the results of numerical calculations. Fuel that is directly injected into the cylinder is transferred toward the cylinder head to form a mixture stratification by using the in-cylinder gas motion that is generated by the interaction between the swirl and squish flows inside a combustion chamber. At first, the flow characteristics were measured in the whole in-cylinder space using an LDV system. Also, numerical calculations of the in-cylinder flow were made using measured data as the initial conditions. Secondly, the local equivalence ratio at several points inside the combustion chamber was measured by using a fast gas sampling device. The results showed that this idea generates the desired stratified charge when the fuel is injected with a higher injection pressure (about 1.3 MPa) at near the intake-BDC timing than with a usual pressure of 0.2 MPa in the port-injection case. Further numerical calculations were performed to examine other factors that might enhance mixture stratification during the compression stroke.
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Authors
Citation
Moriyoshi, Y. and Muroki, T., "Proposition of a Stratified Charge System by Using In-Cylinder Gas Motion," SAE Technical Paper 952455, 1995, https://doi.org/10.4271/952455.Also In
References
- Chang M-F. Nolan M.P. Rillings J.H. Quader A.A. The Axially Stratified Charge Engine: Control, Calibration and Vehicle Implementation SAE Paper No. 851674 1985
- Kuwahara K. Watanabe T. Takemura J. Omori S. Kume T. Ando H. Optimization of In-Cylinder Flow and Mixing for the Center-Spark Four-Valve Lean-Burn Engine Employing the Concept of Barrel-Stratification SAE Paper No. 940986 1994
- Furuno S. Iguchi S. Oishi K. Inoue T. The Effects of Inclination Angle of Swirl Axis on Turbulence Characteristics in a 4-Valve Lean-Burn Engine with SCV SAE Paper No. 902139 1990
- ATZ 1965 359
- Barber E.M. Reynolds B Tierney W.T. Elimination of Combustion Knock - Texaco Combustion Process SAE Trans. 5 1 1951 26
- Frank R. Heywood J. B. The Effect of Fuel Characteristics on Combustion in a Spark-Ignited Direct-Injection Engine SAE Paper No. 902063 1990
- Ghandhi J.B. Bracco F.V. Fuel Distribution Effects on the Combustion of a Direct-Injection Stratified-Charge Engine SAE Paper No. 950460 1995
- Moriyoshi Y. Kamimoto T. Yagita M. Definition of Turbulence in In-Cylinder Flow Fields JSME International J 36-lB 1993 172
- Moriyoshi Y. Experimental Evaluation of Calculation Models Used in In-Cylinder Flow Field Computations JSME Int. Congress COMODIA 94 1994 553
- Moriyoshi Y. Kamimoto T. Yagita M. Prediction of Cycle-to-Cycle Variation of In-Cylinder Flow in a Motored Engine 930066 1993
- Moriyoshi Y. Ohtani H. Kamimoto T. Yagita M. Stratification of Swirl Intensity in the Axial Direction for Control of Turbulence Generation During the Compression Stroke SAE Paper No. 910261 1991
- Watkins A.P. Dessipris S. Khaleghi H. The Combined Effects in Fluid Flow During Compression of Piston Bowl Shape and Offset and Swirl Ratio SAE Paper No. 870595 1987