Simultaneous imaging of soot precursor and soot in a transient spray flame achieved in a rapid compression machine was conducted by laser-induced fluorescence (LIF) and incandescence (LII) methods to study soot formation process in a diesel spray flame. LIF from soot precursor was mainly located in the central region of the spray flame in between 35 and 55 mm from the nozzle orifice. LII from soot surrounded the soot precursor LIF region and extended downstream. First appearance of LIF from soot precursor in the spray flame preceded the appearance of LII from soot. The intensity of LIF from soot precursor reached its maximum immediately after the rich premixed combustion. In contrast, the intensity of LII from soot increased gradually and reached its maximum after the end of injection. Measured LIF spectrum of the soot precursor in the spray flame was very broad and showed no apparent spectral structure. Original is an abstract.
|Number of pages||1|
|Publication status||Published - 1 Dec 2002|
|Event||29th International Symposium on Combustion - Sapporo, Japan|
Duration: 21 Jul 2002 → 26 Jul 2002
|Conference||29th International Symposium on Combustion|
|Period||21/07/02 → 26/07/02|