QUANTITATIVE MEASUREMENTS OF OH CONCENTRATION FIELDS BY 2-DIMENSIONALLASER-INDUCED FLUORESCENCE

Two-dimensional laser-induced fluorescence measurements (2-D LIF) of t he hydroxyl radical distribution in a laminar, premixed methane/air fl at flame at various pressures were performed. Instantaneous and time a veraged concentration fields were determined for three different press ures (1, 5, 20 bar). The 2-D LIF data were set to an absolute scale by a calibration with a novel, single pulse one-dimensional UV absorptio n measurement made simultaneously with only one intensified CCD camera . To compensate effects of beam steering a spherical lens was inserted into the sheet path after the flame. The measurements are compared wi th results from numerical calculations.