Improvement of HCCI Engine Performance by Fuel Composition (Second Report)

-CO Emission Measurement and Realizetion of DP-HTHR Combustion from Refinery Fuels-

Abstract

It was reported that n-heptane and toluene blended fuels(NTL series fuels) showed the dual phase high temperature heat release (DP-HTHR) combustion in a previous paper[1]. DP-HTHR has the potential to enlarge the engine operational range to high load conditions. Further research has been reported in this paper. Initial interests were in the combustion characteristics of a second "bump" in the high temperature heat release in DP-HTHR, since this kind of two-stage combustion appears, when CO oxidation occurs radically. The second interest was the possbility of DP-HTHR combustion with the blends of the refinery based gasolines. Those two topics were fully investigated from the point of combustion and emission data in this paper.