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A Visualized Study for the Effect of Swirl Strength on SI Engine Combustion Characteristics
Published November 01, 1991 by Society of Automotive Engineers of Korea in South Korea
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Tests were performed in an actual engine with swirl and without to understand charge swirl effect for an 1.5l, 4-cyl and 4-stroke SI engine. Swirling inlet flow resulted in the improvement of the engine performance at engine speed of up to 4,000rpm, however, it was reversed at higher engine speed, compared with that of ordinary non-swirling case.
Additionally, a single shot visualized engine driven by a rapid compression expansion machine was built separately to inspect the swirl effect on combustion process. In the visualization study, stoichiometric LPG -air mixture was used at three different levels of swirl strength, where the equivalent engine speed was set at 1500, 2500 and 3500 rpm and taken by shadowgraph technique with a high speed camera. A visualized tests supported the combustion rate increasing phenomena excited by swirl by observations on equivalent flame radii and, also, by energy release fractions and cyclic variations.
CitationHan, J. and Kim, S., "A Visualized Study for the Effect of Swirl Strength on SI Engine Combustion Characteristics," SAE Technical Paper 912455, 1991.
- Matekunas, F. A. A Schlieren Study of Combustion in a Rapid Compression Machine Simulating the SI Engine, 17th Symp. (Int.) of Combustion 1978 1290 1292
- Quader, A. A. What Limits Lean Operation in SI Engines-Flame Initiation or Propagation? SAE Trans. 85 1976 2384
- Witze, P. O. Vilchis, F. R. Stroboscopic Laser Shadowgraph Study of the Effect of Swirl on Homogeneous Combustion in a SI Engine SAE Trans. 90 1981 987
- Heywood J. B. Gatowski, J. A. Flame Photographs in a SI Engine Combustion and Flame 56 1984 75
- Davis, G. C. Mikulec, A. Kent, J. C. Tabaczynski, R. J. Modeling the Effect of Swirl on Turbulence Intensity and Burn Rate in SI Engines and Comparision with Experiment SAE Trans. 95 1986 2 432
- Baritaud, T. A. High Speed Schlieren Visualization of Flame Initiation in a Lean Operating SI Engine SAE Paper, 872152 1987 7