Abstract
Two different octane fuels must be used to optimize an autoignition timing and rate of pressure rise at the hot flame onset, for the ultra lean premixed-compression-ignition engine previously proposed. The burning characteristics in this operation can be elucidated from the roles of high-and low-octane fuels. Higher octane raises the power output by keeping constant-volume heat release near the TDC. However, some amount of high-octane gaseous fuel might not participate in burning due to its poor self-ignition tendency, which resulted in a higher exhust hydrocarbon emission than a spark ignition operation. Hydrogen can be used as a high-octane fuel in this concept, but the power output was insufficient compared to propane. Burning characteristics in this operation would be influenced by the inhomogeneity of cylinder charge, the dispersion of vaporizing liquid low-octane fuel into homogeneous lean high-octane fuel/air mixture, and the ignition and propagation of flame in spatially small scale mixture volumes, which would be depending on the small scale local mixture strength.
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