抄録
Visualization of flame zone in turbulent premixed flames by utilizing acetone-OH simultaneous PLIF (Planar Laser-Induced Fluorescence) method has been demonstrated. Presently-proposed visualization concept is based on simultaneous imaging of "unburned zone" through acetone seeded in the fuel flow and "burned zone" through the combustion-generated OH radical by conventional PLIF system. Since only one laser and one detector combination is required, system cost is relatively low and user could avoid any difficulty related to synchronized control or superimposed imaging process. Instead, selection of band-pass filter plays important role on the current imaging procedure. From visualized images, multiple quantities related to local flame structure and status; such as 1) flame shape (including curvature), 2) localized relative OH mole fraction, 3) flame zone and so on, are successfully obtained. Applicability to further turbulent flame diagnostics is pointed.
