Abstract
New flame diagnostics scheme applicable to an ultra-lean combustion, so called "acetone-OH simultaneous PLIF", is presented. By using this scheme, a flame zone is indirectly imaged as the one between unburned and burned zones. Unburned zone is imaged by small amount of acetone seeded into fuel flow (less than 5% of fuel flow rate), whereas the burned zone is imaged by OH generated by combustion. Planar Laser-induced Fluorescence (PLIF) is applied for the 2-D imaging purpose. The combined excitation lines of 266nm and 283nm could pump up acetone as well as OH simultaneously and their fluorescence signals are properly collected by ICCD camera through the dual-peak band-pass filter, which is specially designed to pass efficiently OH and acetone fluorescence signals. Merit and demerit of the present scheme are both pointed in the body and an imaging capability of ultra-lean flame, whose equivalence ratio is less than 0.6, is presented under the demerit-minimized conditions.
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