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The Role of Swirl and Squish in Combustion of the SI Engine
Published January 01, 1980 by Verlag Des Verein Deutscher Ingenieure GmbH in Germany
Because of the strict emission regulation and the social request on fuel saving, the improvement of the combustion efficiency for the automobile engines becomes more and more important. In the spark ignition engine, the utilization of mixture motion in the cylinder is one of the main points of the combustion chamber design. The importance of swirl and the squish is well recognized as a practical means to generate the mixture motion. But their effects on combustion, especially on the process of flame propagation seem to be not clearly recognized. For example T. H. Ma has concluded that neither swirl nor squish but the small scale turbulence generated by them was of direct importance. But this conclusion is not necessarily correct, because the swirl and squish themselves seem to have their own effects as a large scale gas motion on the flame propagation.