Study of soot formation during the combustion of Diesel, rapeseed methyl ester and their surrogates in turbulent spray flames

摘要: Abstract Effects induced by the use of rapeseed methyl ester (RME) as additive or Diesel substitute on soot formation process have been studied in turbulent spray flames. Investigations carried out coupling Laser-Induced Incandescence and Fluorescence (LII/LIF) at 1064, 532 266 nm. LII LIF profiles obtained with fuels containing various amounts (from 10 to 100 vol.%) showed that addition RME a European low-sulphur surrogate (a n-decane/1-methylnaphthalene blend derived from ‘IDEA’ fuel) induces significant reductions quantities precursors (including high-number ring aromatic species light precursors). The study different surrogates (n-decane, n-hexadecane, 1-octadecene oleate) also revealed details oxidation biodiesels could be mimicked only using large esters surrogates. N-alkanes n-alkenes were found unable reproduce occurring during combustion fatty acid (FAME) such those contained RME. analysis correlation existing between threshold index (TSI) peak volume fraction measured flames m-IDEA/RME blends up 80% allowed identification effects involved reduction (i.e. dilution functional group effects). estimation their relative contribution has investigated. Finally, fluence curves time decays heights above burner burning Diesel/RME mixture compared. By this way, it demonstrated biodiesel are bigger than ones region. On other hand, particles oxidize much faster when is added Diesel.