Premixed compression-ignition

Jacobs, T. J., Bohac, S. V, Assanis, D. N., and Szymkowicz, Lean and Rich Premixed Compression Ignition Combustion in a Light-Duty Diesel Engine, SAE, 2005-01-0166, 2005. 

Iwabuchi Y., Kawai K., Shoji T., and Takeda Y. (1999) Trial of new concept diesel combustion system premixed compression-ignited combustion. SAE Paper 1999-01-0185. 

Certain operating characteristics of the Diesel or compression-ignition engine result from the nature of the combustion process. In particular, the engine operates over a comparatively wide range of over-all fuel/air ratios because fuel and air are not premixed. At a given speed the range is from approximately 0.01 pound per pound (580% excess air) at no load to about 0.055 pound per pound (20% excess air) at full load. Excess air is essential to ensure complete combustion and avoid smoke production. 

Aoyama, T., Hattori, Y., Mizuta, J., and Sato, Y. (1996) An experimental study on premixed-charge compression-ignition gasoline engine. SAE Paper 960081. 

In this study, the relationship between oscillatory heat release and large vortex structure was systematically examined as a function of flow and chemistry scaling. Figure 16.3 shows the experimental setup used for producing vortex flames. A premixed propane-air jet was ignited, and the flame was stabilized at the exit downstream of a sudden-expansion flameholder. A 75-watt compression driver was used to apply controlled disturbance and to produce periodic vortices into a jet flame. The frequency response of actuation was evaluated separately to maintain a similar amplitude of acoustic disturbance at the exit plane. The objectives were to identify the location for active fuel injection in the general case and to establish a scaling criterion. 

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