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International Journal of Automotive Technology

, Volume 9, Issue 6, pp 671–678 | Cite as

Effect of fuel stratification on initial flame development: Part 2-low swirl condition

  • I. Y. Ohm
  • C. J. Park
Article

Abstract

This paper is the second invstigation on the effect of fuel stratification on flame propagation. In the previous work, the characteristics under the no port-generated swirl condition, i.e., the conventional case was studied. In this work, the flame development under the low swirl condition was considered. For this purpose, the initial flame development and propagation were visualized under different axially stratified states in a modified optical single cylinder SI engine. The images were captured by an intensified CCD camera through the quartz window mounted in the piston. Stratification was controlled by the combination of the port swirl ratio and injection timing. These were averaged and processed to characterize the flame propagation. The flame stability was estimated by the weighted average of flame area and luminosity. The stability was also evaluated through the standard deviation of flame area and propagation distance and through the mean absolute deviation of the propagating direction. The results show that the flame-flow interaction determines the direction of flame propagation and that the governing roles of the two factors vary according to the stratified state and the location in the cylinder. In addition, the flame development and the initial flame stability are strongly dependent on the stratified conditions, and the initial flame stability is closely related to the engine stability and lean misfire limit. Lastly, there is no essential difference in gasoline and CNG flame propagation characteristics.

Key Words

Initial flame Stratification Engine stability Lean misfire Limit Visualization 

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Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg GmbH 2008

Authors and Affiliations

  1. 1.Department of Mechanical Engineering and Graduate School of Energy & EnvironmentSeoul National University of TechnologySeoulKorea

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