Laser diagnostics of NO reburning in fuel-rich propene flames

Absolute NO concentrations were measured by laser-induced fluorescence (LIF ) in three different fuel-rich non-sooting propene names (phi = 1.5, 1.8 an d 2.3). The experiments were performed in low-pressure premixed propene fla mes with 0.2%-1% NO added. Laser diagnostics was applied as a tool for inve stigating reburn chemistry. The Q(2)(25,5) line in the A-X(0,0) band was ex cited because of the small temperature dependence of its ground state popul ation. The NO fluorescence lifetimes were measured directly and compared to theoretical values. The initial NO levels are strongly reduced in all thre e flames. According to modeling results, the HCN mole fraction increases st rongly with stoichiometry. As guidelines for laser diagnostics applications in such systems, the modeling results were analyzed with respect to the ma in reaction channels and reaction partners in fuel-rich flames.