Affiliations: Division of Mechanical and Space Engineering, Hokkaido
University, N 13 W 8, Kita-ku, Sapporo 060-8628, Japan. E-mail:
yuji-mg@eng.hokudai.ac.jp | Toho Gas Co. Ltd, 19-18, Sakurada-cho, Atsuta-ku,
Nagoya 456-8511, Japan | Department of Mechanical Science Engineering, Nagoya
University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
Abstract: A strategy of diagnostics of ultra-lean combustion based on
acetone-OH simultaneous PLIF is presented. Acetone seeded in the fuel flow and
combustion-generated OH work for a marker of
"unburned" and "burnt" zones,
respectively. Since acetone and OH does not coexist when the proper combustion
takes place, the signal "valley" (dark zone) between acetone and OH
fluorescence can be detected, which corresponds to flame zone; representative
of the combustion status. System required for current imaging technique is
one-laser and one-detector combination with "turned"
band-pass filter. Transmittance characteristics of the filter and
acetone-seeding rate are key issues to attain clear imaging, and we found that
there is proper combination of them for that purpose. Imaging demonstration for
the turbulent premixed flames shows the usefulness and applicability of this
scheme on complex flame diagnostics: unique flame broken flame structure
("unburned" or "burnt" islands exist separately) are clearly obtained by this approach.
