dc.creator Paul, Phillip H. en_US dc.date.accessioned 2006-06-15T19:13:48Z dc.date.available 2006-06-15T19:13:48Z dc.date.issued 1999 en_US dc.identifier 1999-MF-02 en_US dc.identifier.uri http://hdl.handle.net/1811/19240 dc.description $^{a}$ H.N. Najm, P.H. Paul, C.J. Mueller and P.S. Wyckoff, Combustion and Flame 113, 312 (1998). en_US dc.description Author Institution: Sandia National Laboratories en_US dc.description.abstract Planar laser-induced fluorescence (PLIF) imaging of native diatomic and polyatomic radicals has been applied to investigate the chemical response of a laminar premixed flame subjected to a transient interaction with a laminar vortex pair. This flow exhibits both unsteady curvature and strain and thus may be considered a `unit cell' case for the study of turbulence-chemistry interactions. The experiment indicates substantial under and overshoots in CH and OH, respectively, during the flow transient. These results are not predicted by a numerical simulation (using detailed chemistry and transport models) of the flow. Examination of the computational results indicate a critical need for measurements of polyatomic radicals, particularly those playing a central role in the conversion of fuel to CO, as well as measurements of rates of heat release and species $production ^{a}$. PLIF image results for HCO and $CH_{2}O$ are presented and the application of these data to infer local rates of reaction (e.g. for $OH + CH_{2}O \Rightarrow H_{2}O + HCO$) and heat release are discussed. The reliability of the more traditional measures of flame position or heat release rate (e.g. CH or OH PLIF imaging, and $CH^{\ast}$ or $C_{2}^{\ast}$ chemiluminescence imaging) are considered. Progress in the development of new PLIF imaging tools for other species is presented (e.g. for $CH_{3}, CH_{3}O$ and OCHOCH). The continuing need for high-temperature spectroscopic and collisional energy transfer data for polyatomic flame radical species is also discussed. en_US dc.format.extent 186796 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title OBSERVATION OF THE EFFECTS OF FLOW UNSTEADINESS ON THE CHEMICAL STRUCTURE OF PREMIXED FLAMES en_US dc.type article en_US
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