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Two-Point Scalar Time-Series Measurements in Turbulent Partially Premixed Flames

机译：湍流部分预混火焰中的两点标量时间序列测量

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The technique of Picosecond Time-Resolved Laser-Induced Fluorescence (PITLIF) was expanded to enable two-point hydroxyl (OH) series concentration time series measurements of turbulent jet flames. Measurements were obtained with two-point separation along the radial direction of the jet (delta r), i.e., the propagation direction of the horizontal laser beam, as well as axial two- point separations, i.e. along the axis of the jet, i.e., the z-direction. As the jet configuration is statistically axisymmetric, so that statistical analyses along the azimuthal direction can be considered insignificant, this allows complete coverage of the jet flame. Investigation of axial two-point statistics requires a different laser configuration than that of the previous radial two-point system: either a single vertical laser beam or two horizontal beams with adjustable vertical separation. The combustor used in this study has a closed base which does not permit vertical alignment of a laser; hence, the two-beam configuration was adopted. With the installation of our new diode- pumped laser system, which generates nearly ten times more UV power than before, the laser can now be split into two beams while still providing a sufficient signal level at each probe volume. This paper describes experimental details for this new approach and its demonstration within a well-studied turbulent hydrogen-nitrogen nonpremixed flame, the H3 flame (H2/N2 = 50:50, Re = 10,000).

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