Abstract
Flame lift-off length in diesel spray is currently recognized as an indicator of sooting tendency during mixing-controlled combustion and is affected by fuel reactivity. This paper reports the experimental investigation of the flame lift-off length and its effects on emissions for dual-component fuels consisting of different less reactivity component. The experiments were conducted at quiescent ambient condition in a Rapid Compression and Expansion Machine. Gasoline-like components contained in dual-component fuel and ambient oxygen concentrations were set as major experimental variables. The experimental results, based on pressure analysis, burned gas analysis and imaging of luminous flame and OH chemiluminescence, show that mixing higher octane number component has lower luminous intensity indicating lower soot because of longer lift-off length and dual-component fuel achieves low soot and NO_x combustion without excessive decrease of ambient oxygen concentration.
