Effects of Reaction Intermediates on Auto-ignition Delay Time (Second Report)

- Influences of Temperature and Equivalence Ratio -

Abstract

The ignition timing of homogeneous charge compression ignition (HCCI) combustion engines is the important factor which should be controlled. In this study, the influences of the adding reaction intermediates to auto-ignition delay time were evaluated, by using a constant volume combustion simulation with detailed chemical reaction models of n-heptane. The lower the initial temperature becomes, the larger the effect of additives on the ignition promotion becomes. Therefore, it is appropriate to supply additives at the temperature which is dominated by low temperature oxidation reaction, in order to control the auto-ignition timing of HCCI combustion.