Flame propagation into lean region in stratified mixture

T. Kitagawa, H. Kido, K. S. Kim, K. Fujioka

Research output: Contribution to conferencePaperpeer-review


In diesel engines, most of the fuel is burned in a diffusion combustion phase, leading to the formation of excessive amount of soot and NOx emissions. To decrease soot and NOx emissions simultaneously, the concept of lean homogeneous charge compression ignition (HCCI) engine was proposed. The onset of the combustion of the HCCI engine depended on the autoignition of the fuel, thus, it was quite difficult to control the start of combustion. In contrast, Pulsed Flame Jet (PFJ) showed a great potential to enhance ignition reliability and burning rate in lean mixtures within the lean flammability limit. A compact rapid compression machine (RCM) was used in the experiments, and the fuels used were lean n-butane/air mixtures. The compression ratio of RCM was adjusted to 14.7, and the cavity volume of PFJ used was 500 cu mm and two orifice diameters (4 and 2.5 mm) were used. Thus, the start of combustion of lean n-butane/air mixtures changed appropriately with varying the ignition timing of PFJ. PFJ shoed a potential for ignition timing control of homogeneous charge compression ignition combustion. Original is an abstract.

Original languageEnglish
Number of pages1
Publication statusPublished - 2002
Event29th International Symposium on Combustion - Sapporo, Japan
Duration: Jul 21 2002Jul 26 2002


Other29th International Symposium on Combustion

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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