抄録
The principal issues of Homogeneous Charge Compression Ignition (HCCI) combustion that must be addressed include ignition timing control and expansion of the stable operation region. Detailed analyses of ignition and combustion mechanisms must be undertaken to resolve these issues. In this study, spectroscopic techniques were used to investigate the effects of the residual gas state on ignition and combustion characteristics. Spectroscopic measurements were made of light emission intensity and of absorbance at a wavelength corresponding to the passage of a cool flame. As a result, when a low-octane fuel was used, the heat release rate waveform for HCCI combustion showed evidence of the passage of a cool flame, which was clearly observed in the light emission spectra and light absorption behavior.
